TITLE: SABS PROFICIENCY TESTING SCHEME, RSA

Transcription

1 TITLE: SABS PROFICIENCY TESTING SCHEME, RSA PRESENTED BY: Ms C. MODIKA Contact Info : +7(0) Fax No. ; +7(0) Modikac@sabs.co.za TANZANIA, 3 8 December 007 Mission Mission Statement of SABS: Ø To offer valueadded standardization services on an ethical and principled basis that uplift the African standard and empower South African industry to compete vigorously towards increased market access. In so doing SABS contributes to the economic growth of South Africa and Africa as a whole within a framework that protects consumers and the environment by promoting uncompromised quality of products and services.

2 SABS BUSINESS UNITS Chemicals Electro technical Food and Health Services SABS Mining and Minerals Mechanical and Materials Transportation 3 Purpose of PTS The SABS Commercial (Pty) Ltd (Food Chemistry), is a provider of a proficiency testing scheme (PTS) and recognized by a accreditation body SANAS (South African National Accreditation System) according to ILAC G 3 (Guidelines for the requirements for the competence of providers of proficiency testing schemes). It is recognised that schemes conducted may have primary aims such as establishing the effectiveness and precision of test methods, equipment and evaluating the individual performance of laboratory staff. 4

3 Purpose of PTS Proficiency testing schemes are used by laboratory accreditation bodies as part of an assessment process to verify competence of a laboratory. A high level of confidence is given to an accredited proficiency testing scheme (PTS) based on international acceptable requirements. Running a PTS Programme improves the quality system of the laboratory. 5 SABS WATER CHECK (PTS) SABS WaterCheck (PTS) is a high frequency interlaboratory Inorganic Chemistry Water proficiencytesting programme with the objective of providing a rapid reportback service to participants for selfevaluation SABS WaterCheck allows flexibility in participation and no specific methods or instrumentation are prescribed. The programme is divided into three categories, each category being scheduled on a quarterly basis. 6

4 PTS Provider, SABS is supply the following: Preparation of samples for the following groups Group Heavy metals in water: aluminium, barium, beryllium, boron, cadmium, chromium, cobalt, copper, iron, lead, manganese, molybdenum, nickel, silicon, strontium, vanadium, zinc, mercury, arsenic and selenium. Scheduled : January, April, July, and October. 7 Provides the following Group Nutrients and oxygen demand: kjeldahl nitrogen, nitrate, ammonia, total phosphate, orthophosphate, oxygen absorbed, chemical oxygen demand, dissolved organic carbon and total organic carbon. Scheduled : February, May, August, November. 8

5 Provides the following Group 3 Major constituents in water: ph, conductivity, dissolved solids, calcium, magnesium, sodium, potassium, chloride, fluoride, sulfate, alkalinity, nitrate and turbidity. Scheduled: March, June, September, and December 9 REPORT REPORT DISCUSSION 0

6 Conclusion List of participating laboratories/client base locally and Internationally for all the groups (0) PARTICIPATION ON THE SCHEME MEANS GROWTH, IMPROVEMENT AND TAKING THE LABORATORY TO AN IMPROVED QUALITY SYSTEM.

7 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE A ANALYTICAL RESULTS Okt 07 GROUP Gr (cont) Page 4 of 3 Determinand B B3 B5 B7 B8 B9A B9B B0 BA BB B4 B6 B6a B9 BA BB B B3 B5 B30 B3 B33 B34 B36 Spike ug/l Median Robust SD n 73,0 79,0 803,0 807,0 857,0 80,0 590,0 995,0 959,0 75,0 870,0 87,0 573,0 78,0 804,0 750,0 80, Aluminium as Al in µg/l ,0 03,0 34,0 54,0 73,0 3 36,0 379,0 38,00 95,0 36,0 356,0 6,0 375,0 57, ,5 00,0 67,0 434,0 0,0 7,0 85,0 70,0 86,0 46,0 9,0 9,0 85,0 50,0 90, Barium as Ba in µg/l 5,5 53,0 468,0 470,0 549,0 559,0 490,0 470,0 774,0 434,0 489,0 483,0 49,0 450,0 488, ,5 344,0 34,0 9,0 307,0 388,0 335,0 30,0 55,0 303,0 37,0 336,0 37,0 300,0 37, ,00 49,00 5 0,0 5,00 5,00 5, ,00 47,00 34,00 5 5, Beryllium as Be in µg/l 39,5 49,0 53,0 4,0 49,0 56,0 55,0 50,0 90,0 8,0 0,0 50,0 54,0 50,0 50, ,00 6,00 9,00 77,50 59,00 93,00 8 7,0 96,00 46, ,00 00,0 8, ,5 560,0 59, ,0 576,0 550,0 330,0 776,0 763,0 505,0 57,0 566,0 500,0 54, Boron as B µg/l , , , ,5 7,0 5,0 478,0 45,0 33,0 40,0 0,0 54,0 55,0 3,0 5,0 5,0 7,0 6,0 0,0 0,0 5,0 6,0 3 5 Cadmium as Cd in µg/l 553,0 57,0 489,0 4,0 577,0 53,0 540,0 500,0 650,0 66,0 476,0 500,0 504,0 50,0 50,0 470,0 489,0 500,0 50, ,5 30,0 34,0 0,0 3,0 65,0 80,0 40,0 30,0 33,0 8,0 40,0 33,0 4,4 5,0 30,0 46,0 50,0 4, Chromium as Cr in µg/l , ,0 43,0 55,0 34, ,0 397, ,0 5,0 6, ,0 34,0 37,3 550,0 370,0 87,0 600,0 397, ,0 377,0 380,0 369,0 405,0 385,0 450,0 380,0 544,0 534,0 386,0 40,0 39,0 437,4 395,0 370,0 398,0 400,0 397, Cobalt as Co in µg/l 798,5 797,0 77,0 76,0 80,0 769,0 850,0 780, ,0 760,0 796,0 855,0 800,0 740,0 797,0 800,0 797, ,5 68,0 84,0 6,0 00,0 9,0 0,0 90,0 40,0 45,0 96,0 95,0 88,0 0,5 94,0 90,0 00,0 00,0 95, ,0 3,0 37,0 306,0 884,0 336,0 38,0 350,0 90,0 47,0 40,0 34,0 30,0 359,0 35,3 306,0 90,0 34,0 300,0 3, Copper as Cu in µg/l , , , ,0 388,0 55,0 57,0 363,0 53,0 50,0 50,0 795,0 773,0 305,0 55,0 45,0 60,0 589,0 380,0 464,0 600,0 490, , , Iron as Fe in µg/l ,0 439,0 338,0 987,0 454,0 48,0 3 50,0 505,0 37,00 465,0 440,0 375,7 660,0 375,0 46,0 65,0 438, ,5 4,0 69,0 675,0 09,0 6,0 50,0 0,0 9,0 3,0 75,0 50,0 69,0 70,0 56,0 50,0 54, Lead as Pb in µg/l 848,0 604,0 64,0 55,0 555,0 65,0 66,0 490,0 766,0 56,0 50,0 58,0 603,0 500,0 577,0 600,0 586, ,0 85,0 07,0 93,0 96,0 99,0 6,00 90,0 35,0 4,0 30,0 67,0 9,0 40,0 6,0 300,0 9, ,0 8,0 46,0 4,0 47,0 854,0 8,0 80,0 90,0 40,0 346,0 33,0 7,0 60,0 86,0 79,7 7,0 78,0 50,0 70, Manganese as Mn in µg/l ,0 408, , ,0 980, , ,5 53,0 489,0 507,0 48,0 3,0 55,0 530,0 560,0 500,0 65,0 655,0 470,0 495,0 53,0 59,0 5,0 59,0 500,0 493, ,900 6,000,400 0,770 0,400 0,70 3,000, Mercury as Hg in µg/l 3,50 7,800 6,000 7,600, ,800 5,00 0,7 9,000 8, ,800 6,000,500 0,950 0,900 7,000 0,350 6,000, Molybdenum as Mo in 48,5 74,00 83,00 89,0 98, ,0 75,00 69,00 5,80 99,00 00,0 89, ,0 67,0 75,0 45,0 306,0 90,0 50,0 377,0 50,0 63,0 47,6 87,0 300,0 75, µg/l 3 50,0 87,0 63,0 30,0 99,0 50,0 80,0 94,0 45,00 94,0 7,5 99,0 00,0 88, Nickel as Ni in µg/l ,0 53,0 59,0 567,0 577,0 577,0 900,0 550,0 734,0 78,0 540,0 630,0 556,0 573,0 549,0 570,0 553,0 550,0 554, Silicon as Si in µg/l ,0 78,0 74,0 3,0 5,0 0,0 50,0 60,0 9,0 36,0 75,0 84,0 78,0 77,0 8 76, Strontium as Sr in µg/l 353,0 347,0 37,0 338,0 35,0 380,0 80,0 330,0 443,0 45,0 37,0 339,0 330,0 330,0 40,0 330, ,0 64,0 5,0 44,0 58,0 9,0 5,0 50,0 334,0 39,0 93,0 6,0 55,0 5,0 60,0 55, ,0 9 76,00 39,0 63,00 9, ,0 5,0 8,0 7 95,00 00,0 86,0 8 8 Vanadium as V in µg/l 395,0 390,0 404,0 87,0 39,0 43,0 430,0 390,0 553,0 394,0 45,0 398,0 400,0 399, ,0 5,0 08,0 09,0 43,0 55,0 7,0 0,0 7,0 3,0 8,0 9,0 00,0 43, ,5 474,0 44,0 45,0 48,0 454,0 463,0 540,0 440,0 67,0 500,0 45,0 57,0 47,0 469,0 40,0 457, , Zinc as Zn in µg/l 504,5 448,0 386,0 43,0 48,0 40,0 40,0 480,0 40,0 554,0 546,0 484,0 395,0 478,0 383, 43,0 375,0 49,0 0,0 45, ,0 77,0 37,0 33,0 36,0 35,0 390,0 340,0 448,0 46,0 30,0 35,0 36,0 308, 353,0 300,0 340,0 8 36, ,00 5,000 5,900,000,00 3,000 4,45 3 Arsenic as As in µg/l 5 5,00 8,00 4,00,00 5,00 5,00 4, ,00,00 9,00 5,000 6,00 9,000 8,835 4,0 7,900 8,00 8,900 6,500 8,00 7,500 8, Selenium as Se in µg/l 5 03,5 3,00 6,00 6,60 3,00 0,90,50 5, ,00 5,500 7,000 6,0 7, ,300,00 5,000 7,

8 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE A ANALYTICAL RESULTS Okt 07 GROUP Gr (cont) Page 5 of 3 Determinand B38 B39 B4 B4 B45 B49A B49B B63 B68 B69A B69B B69C B70 B7 B73 B74 B76 B78 B79 B8 B86 B88 B9 Spike ug/l Median Robust SD n 650,0 87,0 754,0 940,0 903,0 780,0 797,0 858,0 75,7 863,0 353,0 890,0 74,0 750,0 80, Aluminium as Al in µg/l ,0 49, ,0 60,0 4,0 3,0 73,0 73,4 7,0 37,0 70,0 99,0 375,0 57, ,0 90,0 55,0 00,0 9,0 86,4 07,0 90,0 00,0 50,0 90, Barium as Ba in µg/l 483,0 487,0 469,0 480,0 47,0 474,6 59,0 490,0 50,0 450,0 488, ,0 339,0 305,0 337,0 3,0 38,5 345,0 33,0 350,0 300,0 37, ,00 43, ,00 49, Beryllium as Be in µg/l 46,0 68,0 50,0 33,0 5, 50,0 50, ,0 5,00 63,00 8 8,79 00,0 8, ,0 599,0 536,0 6,0 60,0 500,0 54, Boron as B µg/l , ,0 933, ,0 8,0 0,0 3,0 5,0 0,0 8,0,0 35,0 09,0 40,0,0 5,0 6,0 3 5 Cadmium as Cd in µg/l 60,0 496,0 500,0 509,0 500,0 453,0 50,0 469,0 50,0 439,0 540,0 95,0 500,0 50, ,0 53,0 40,0 00,0 7,0,0 45,0 7,0 65,0 06,0 60,0 4,0 50,0 4, Chromium as Cr in µg/l ,0 7,00 480,0 384,0 37,0 433,0 378,0 330,0 39,0 433,0 350,0 30,0 600,0 397, ,0 397,0 350,0 40,0 395,0 397,0 404,0 407,7 44,0 370,0 40,0 386,0 400,0 397, Cobalt as Co in µg/l 983,0 790,0 70,0 800,0 779,0 777,0 804,0 804,7 89,0 76,0 850,0 768,0 800,0 797, ,0 98,0 40,0 93,0 88,0 6,0 98,0 00,0 7,0 69,0 0,0 95,0 00,0 95, ,0 3,0 330,0 33,0 309,0 34,0 34,0 35,8 346,0 89,0 330,0 33,0 300,0 3, Copper as Cu in µg/l , ,0 38,0 400,0 339,0 340,0 58,0 449,0 463,6 55,0 436,0 570,0 44,0 600,0 490, , , , ,0 960, Iron as Fe in µg/l ,0 99,0 4,00 500,0 45,0 45,0 659,0 39,0 409,8 33,0 438,0 50,0 368,0 65,0 438, ,0 09,0 90,0 6,0 98,00 79,0 54,0 6,0 9,00 04,0 50,0 37,0 50,0 54, Lead as Pb in µg/l 65,0 688,0 590,0 6,0 577,0 608,0 593,0 594,0 55,0 44,0 580,0 565,0 600,0 586, ,0 30,0 70,0 88,0 58,0 9,0 3,00 6,0 07,0 00,0 66,0 300,0 9, ,0 87,0 69,0 60,0 89,0 7,0 90,0 67,0 70,9 88,0 46,0 80,0 59,0 50,0 70, Manganese as Mn in µg/l 930,0 999, ,0 849, , , ,0 539,0 505,0 490,0 53,0 484,0 303,0 495,0 508,9 539,0 456,0 530,0 484,0 500,0 493, ,000 <00.0 4,500 3,000, Mercury as Hg in µg/l <00.0 7,500 9,000 8, ,000 <00.0,500 6,000, ,000 57,00 03,0 33,0 9,03 77,00 8,00 00,0 89,7 4 9 Molybdenum as Mo in µg/l 4,00 59,0 75,0 305,0 67,4 70,0 73,0 300,0 75, ,00 60,0 9,0 8,0 6,8 78,0 9,0 00,0 88, Nickel as Ni in µg/l ,0 546,0 530,0 563,0 503,0 56,0 549,0 563,3 594,0 496,0 560,0 57,0 550,0 554, , Silicon as Si in µg/l ,0 8,0 49,0 8,0 3,0 79,0 75,5 8 76, Strontium as Sr in µg/l 349,0 37,0 36,0 335,0 378,0 36,0 33,0 40,0 330, ,0 57,0 76,0 55,0 98,0 50,0 57,0 60,0 55, ,00 8,00 5,00 7,00 78,70 63,00 78,00 00,0 86,0 8 8 Vanadium as V in µg/l 46,0 373,0 45,0 4,0 40,0 368,0 39,0 400,0 399, ,0 3,00 08,0 45,0 3,7 44,0 7,0 00,0 43, ,0 47,0 460,0 483,0 450,0 46,0 446,0 49,0 40,0 500,0 47, , Zinc as Zn in µg/l 59,0 47,0 450,0 439,0 45,0 46,0 49,5 455,0 380,0 450,0 383,0 0,0 45, ,0 343,0 300,0 305,0 64,0 333,0 333, 339,0 85,0 370,0 36,0 8 36, ,000,60 3,000 4,45 3 Arsenic as As in µg/l 5 4,00 4,00,00 5,00 4, ,000 8,670 9,000 8,835 4 <0.00 9,30,800 7,500 8, Selenium as Se in µg/l 5,000 3,00 5,60 3,500,50 5, <0.00 4,630,500 5,000 7,

9 TABLE A ANALYTICAL RESULTS Okt 07 GROUP Gr (cont) Page 6 of 3 Determinand B93 B94 B99 B00 B0 B03 B04 B05 B07 B08 B09 B B3 B5 B6 B7 Ba Bc B3 B4 B5 B6 B7 B8 Aluminium as Al in µg/l Barium as Ba in µg/l Beryllium as Be in µg/l Boron as B µg/l Cadmium as Cd in µg/l Chromium as Cr in µg/l Cobalt as Co in µg/l Copper as Cu in µg/l Iron as Fe in µg/l Lead as Pb in µg/l Manganese as Mn in µg/l Mercury as Hg in µg/l Molybdenum as Mo in µg/l Nickel as Ni in µg/l Silicon as Si in µg/l Strontium as Sr in µg/l Vanadium as V in µg/l Zinc as Zn in µg/l Arsenic as As in µg/l Selenium as Se in µg/l 700,0 790,0 98,40 873,0 809,0 730,0 890,0 80, ,0 776,0 750,0 80, ,0 57,0 445,9 6,0 0,0 00,0 80,0 34,3 69,0 36,0 4,0 375,0 57, ,0 03,0 8,3 8,0 85,0 50,0 90, ,0 56,0 473,5 469,0 47,0 450,0 488, ,0 357,0 35,0 34,0 36,0 300,0 37, ,00 50,89 57, ,0 63,0 5,8 69,0 50,0 50, ,00 83,00 74,0 9,00 00,0 8, ,0 59,0 5,0 5,5 487,0 54,0 500,0 54, , ,0 968,9 97, ,0 30,0 4,6 8,0 46,0 35,0 34,0,0 6,9 08,0 8,0 50,7 4,0 7,0 5,0 6, ,0 540,0 505, 54,0 58,0 538,0 5,0 50,0 50, 47,0 45,0 54,5 503,0 57,0 500,0 50, ,0 60,0 43,6 54,0 80,0 66,0 5,0 30,0 00,9 05,0 89,0 76, 53,0 3,0 50,0 4, ,0 4,0 560,0 403, 45,0 440,0 4,0 343,0 305,0 39,0 96,0 95,8 3,0 600,0 397, ,0 400,0 406,3 399,0 4,0 397,0 403,0 385,0 393,6 380,0 403,6 43,0 406,0 400,0 397, ,0 790,0 796,3 797,0 83,0 89,0 799,0 93,0 79,3 738,0 80,6 87,0 8,0 800,0 797, ,0 00,0 89,3 95,0 08,0 94,0 07,0 89,0 9, 79,0 0,8 8,0 03,0 00,0 95, ,0 333,0 330,0 63, 36,0 9,0 39,0 36,0 348,0 305,6 30,0 90,0 303,3 37,0 335,0 300,0 3, ,0 544,0 60,0 34,7 439,0 636,0 59,0 458,0 490,0 34,9 304,0 45,0 504,3 59,0 35,0 600,0 490, , ,0 855,9 96, ,0 490,0 60,0 470,7 476,0 438,0 0,0 454,0 378,0 49, 36,0 598,0 447,0 56,0 458,0 65,0 438, ,0 50,0 6,0 350,8 66,0 78,0 60,0 54,0 7,0 7, 34,0 854,0 50,4 7,0 47,0 50,0 54, ,0 595,0 600,0 774,4 546,0 604,0 67,0 599,0 5,0 603,6 498, ,8 553,0 57,0 600,0 586, ,0 00,0 53,0 538,5 73,0 74,0 8,0,0 85,0 3,9 0,0 438,0 4,3 49,0 67,00 300,0 9, ,0 4,0 70,0 45,4 67,0 90,0 5,0 67,0 60,0 60,3 50,0 54,0 75,6 67,0 7,0 50,0 70, ,0 997, , ,0 99, ,0 97, , ,0 440,0 480,0 464,9 50,0 56,0 475,0 49,0 476,0 495,3 456,0 46,0 54,4 487,0 50,0 500,0 493, ,5,700 3,000, ,4 7,350 9,000 8, ,0,50 6,000, ,00 80, ,74 88,00 00,0 89, ,0 304, 307,0 77,9 6,0 300,0 75, ,0 3,5 77,0 0,0 56,0 00,0 88, ,0 493,0 560,0 58,6 567,0 66,0 576,0 505,0 550,0 565,9 59,0 553,5 504,0 549,0 550,0 554, , , , ,0,50 69,0 85,5 73,0 47,0 8 76,5 3 34,70 3,0 347,3 37,0 76,0 40,0 330, ,90 43,0 64,8 48,0 86,0 60,0 55, ,00 9,00 96,4 9,00 00,0 86, ,0 435,0 46,9 398,0 400,0 399, ,0 60,0 7,8 54,00 00,0 43, ,0 46,0 430,0 4,9 470,0 508,0 486,0 500,0 543,0 407,7 34,0 380,0 0,40 68,0 447, , ,0 4,0 380,0 440,7 440,0 466,0 44,0 453,0 467,0 377,7 3,0 360,0 0, ,0 4,0 0,0 45, ,0 300,0 30,0 35,7 358,0 370,0 354,0 37,0 367,0 7,7 4,0 67,0 0,60 48,0 35,0 8 36, < , 5,000 3,000 4, ,90 38,8 6,00 5,00 4, ,500 58,7 8,000 9,000 8, ,50 55,70 7,500 8, ,0 57,50,50 5, ,450 60,0 5,000 7, Spike ug/l Median Robust SD n

10 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE A ANALYTICAL RESULTS GROUP Page 7 of 3 Determinand B9 B30 B3 B3 A B3B B35 B38 B39 B4 B4 B43 B44 B47 B48 B49 B5 B53 Spike ug/l Median Robust SD n 574, ,0 863,0 937,0 700,0 685, 503,0 750,0 80, Aluminium as Al in µg/l ,0 39,0 39,0 6,0 373,0 75,0 300,0 6,3 0,0 375,0 57, ,0 96,0 96,0 80,0 68,0,0 99,0 50,0 90, Barium as Ba in µg/l 489,0 506,0 506,0 43,0 453,0 56,0 497,0 450,0 488, ,0 334,0 334,0 99,0 37,0 368,0 339,0 300,0 37, ,70 40,60 44, Beryllium as Be in µg/l 37,0 7,0 5,0 50,0 50, ,90 83,70 89,00 00,0 8, ,0 40,0 40,0 405,0 559,0 500,0 54, Boron as B µg/l , , ,00 60,0 40,0 30,0 7,0 04,0 3,6 6,0 5,0 6,0 3 5 Cadmium as Cd in µg/l 374,0 480,0 53,0 498,0 47,0 45,0 49,8 505,0 500,0 50, ,0 50,0 7,0 43,0 36,0 4,0 37,9 50,0 50,0 4, , Chromium as Cr in µg/l ,0 537,0 48,0 50,0 46,0 448,0 630,0 600,0 397, ,0 380,0 373,0 354,0 384,7 370,0 400,0 397, Cobalt as Co in µg/l 85,0 755,0 694,0 86,0 776, 758,0 800,0 797, ,0 8,0 80,0 64,0 93,3 9,0 00,0 95, ,0 60,0 33,0 3,0 30,0 70,0 353,0 30, 39,0 300,0 3, Copper as Cu in µg/l 95, , ,0 500,0 368,0 533,0 57,0 40,0 4,0 564,7 58,0 600,0 490, ,0 850, , , Iron as Fe in µg/l ,00 40,0 540,0 540,0 434,0 60,0 48,0 380,0 50,4 70,0 65,0 438, ,00 63,0 89,0 53,0 55,0 30,0 47,3 48,0 50,0 54, Lead as Pb in µg/l 457,0 605,0 66,0 57,0 567,0 6,0 564,0 5,0 600,0 586, ,0 67,0 44,0 43,0 83,0 6,4 30,0 300,0 9, ,0 0,0 80,0 80,0 7,0 8,0 9,0 70,0 4,6 30,0 50,0 70, Manganese as Mn in µg/l 798,0 850,0 990,0 990,0 959,0 0 07,0 890,0 909, ,0 40,0 470,0 470,0 45,0 55,0 536,0 470,0 457,0 54,0 500,0 493, ,60,500 3,000, Mercury as Hg in µg/l,40 6,500 9,000 8, ,0 0,870 6,000, ,0 0,0 93,70 8,00 90,30 00,0 89,7 4 9 Molybdenum as Mo in µg/l 30,0 30,0 65,0 59,0 300,0 7,0 300,0 75, ,0 7,0 7,0 90,0 0,0 78,0 00,0 88, , , Nickel as Ni in µg/l ,0 57,0 563,0 503,0 467,0 545,7 530,0 550,0 554, Silicon as Si in µg/l ,0 77,0 77,0 76,0 58,0 88,0 7,0 8 76, Strontium as Sr in µg/l 99,0 3,0 3,0 308,0 39,0 350,0 39,0 40,0 330, ,0 40,0 40,0 34,0 44,0 69,0 4,0 60,0 55, ,0 55,0 94,80 76,00 00,0 86,0 8 8 Vanadium as V in µg/l 480,0 480,0 364,0 488,0 30,0 400,0 399, ,0 7,0 69,0 70,0 0,0 00,0 43, ,0 360,0 498,0 460,0 353,0 444,0 493,0 380,0 44,7 50, , Zinc as Zn in µg/l 344,0 370,0 40,0 48,0 3,0 405,0 45,0 360,0 399, 454,0 0,0 45, ,0 80,0 3,0 336,0 54,0 39,0 356,0 80,0 334,4 375,0 8 36, ,830 3,00 3,000 4,45 3 Arsenic as As in µg/l 5 4,0 3,00 5,00 4, ,000 9,000 8, ,30 3,00 7,000 7,500 8, Selenium as Se in µg/l 5 4,30 9,300,00,50 5, ,00 5,000 5,000 7, Okt 07

11 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE B ZSCORE VALUES Okt 07 GROUP Gr (cont) Page 8 of 3 Determinand B B3 B5 B7 B8 B9A B9B B0 BA BB B4 B6 B6a B9 BA BB B B3 B5 B30 B3 B33 B34 B36 Aluminium as Al in µg/l 0,76 0,9 0,0 0,0 0,0 0,05 0,9 0,53 0,93 0,08,00,03,4,85,97,50,04 0,48 0,65 0, 0,3,9,36 0,9 0,4 0,0 0,5 3 0,54 0,64 0,99 0,9,69,9,3,44,59 0,73 0,5,7 0,49 Barium as Ba in µg/l 0,9 0,9 0,94,55 0,75 6,45,0,9,8,66,35 6,47 0,7,97,0 0,3 0,9 0, 3 0,03 0,96 0,73,0, 3,43 0,45 0,39,3,35 0,5 Beryllium as Be in µg/l 4,7,4 0,3 0,40 0,3 4,86 0,3 0,8,0 5,39,0 4,3 5,39 4,05 0,54 3,45 0,3,67 0,8 0,3 0,86,,04,6 0,60 0,57 Boron as B µg/l,6 0,43 0,36 0,53 0,94 7,59 3,0 0,5 0, 0,66 0,80 0,7 0,03 3,95 4,0 4,40 4,66 4,6 3,8 3,9 0,58 0,03 0,47 3 0,0 0,59 0,,57 0,5 0,84 0,46 3,47 4,50 4,00,34 0,39 0,06 Cadmium as Cd in µg/l 0,86,56 0,46 0,8 0,40 6,37 8,83,4,30 0,5 0,9,05,6,0 0,06,0 4,54,7 3,80 0, 0,80 0,06 0,06 0,45 0,98 0,45 0,40 3,7 0,57 0,36 7,6 0,5,4,0 0,05 4,0 3,73 0,05 0,4 0,57 0,57 0,6 Chromium as Cr in µg/l 3,05 0,83,63 0,56 0,60 0,85 0,64 0,88 0,3 8,94 7,69 0,86 0,08 0,37 0,05 0,94 0,8,5,0,48 33, 0,33 0,69 0,7,75 7,7 7,5,70 0,0 0,37 0,3,37 0,33 3 0,53 0,5,4 0,80 8,54 0,6 3,6 0,55,,07 3,55 0, 0,53,48 0,6,06 Cobalt as Co in µg/l 0,9 0,0 0,73,37 0,44 7,39 6,8 0,73 0,96 0,03,50 0,08,48 0,8, 0,94,55 0,44,94 0,94 8,6 7,60 0,6 0,7 0,8,4 0,,50 0,06 3 0,05,60,06 6,65 0,48 0,9,4 0,48 4,33 4,8 0,0,49 0,0 0,48 0,48 Copper as Cu in µg/l,40 0,46 0, 3,69 0,59 0,5,8,35 4,43 3,7 0,08 0,08,56,8,35 0,08 0,3,33 0,0 7,6 0,03 0,08 0,08 7,03 5,9,00 0,56,36,84 0,4,85 3 0,35 0,87 0,5 0,3,08 0,8 0,6 0,7,60,4,58 0, 0,55 0,95 0,85 0,94 0, Iron as Fe in µg/l 0,63 0,6,53 0,37 0,0 0,09 9,4 7,6,3 0,49,9 0,0,08,37 6,6,99 7,68,67,48,08 0,50 0,4,58 0,0, 0,4,7,09 0,47 0,58 0,08 3 0,8 0,0,07 5,86 0,7 0,45 4,36 3,08 0,7 4,9 0,8 0,0,37 0,68 0,4 Lead as Pb in µg/l 8,57 5,79 0,99 0,40 0,49 0,84 7,4 7,3,48 0,69 0,3 0,64 0,3 0,66,,,5 3,98,0,33 0,69,46 0,3 0,09 0,49 0,38 0,53,90 0,0 3 4,75 0, 0, 0,0 0,05 0,0,74,90,6 0,58 0,40,54 0,8 0,47 Manganese as Mn in,3 0,6,43,7,38 34, 0,68 0,56,5,79 4,43 3,6 0,03 0,6 0,9 0,54 0,03 0,44 0,4,8 0,66,88 0,36 0,98 0,69 0,86 0,05 0,3 5,64 5,57,5 0,4,06 0,43 0,3 0,40 µg/l 3 0,8 0,8 0, 0,37 7,7,58,00,83 0,8 4,33 4,44 0,65,03 0,70 0,48 0,70 Mercury as Hg in µg/l,9 0,6 0,8,6 0,77 0,3 0,33 0,5,00 0,77,4 0,8,44,7 0,68 0,53 3,98,0 0,49 0,78 0,9,4 Molybdenum as Mo in 4,07,09 0,47 6,87 0,57,3,0,44,56 0,64,8 6,3,3 0,63,05 4,30,05 0,5,5 0,5 µg/l 3,40 0,06,00 4,44 0,4,50 0,33 0, 5,6 0, 0,66 0,4 Nickel as Ni in µg/l 0,84,58 0,70, 0,63 0,46,6 0,89 0, 0,0 0,73 0,84 9,5,68 0,60 0,0 5,68 6,86 5,90 6,7 0,63 0,49 0,76 0,3 0,76 0,0 0,78 0,79 0, 0, 0,76 0,46 0,09 0,7 3,54 0,7 0,78 0,37 0,47 0,4 5,43 5,5 0,45,8 0,55 0,7 0,46 0,05 Silicon as Si in µg/l 0,69 0,90,00 0,0 0,66 0,6 0,4,35 0,7 0,0 0,74 0,3,86 3,45,3,63,60,46 0,4 0,98 0,37 0, 0,6 3 0,89 7,83 0,58 0,8 0,0 0,59 3,05,77,68 0,0 0,76 Strontium as Sr in µg/l 0,66,4 0,,04 0,9 0,8, 0,49,97 0,3,97 3,07,04 3,07,7 4,05 6,93 4,59 7,4 0,,5 0,58 0,55 0, 3 0,56 0,5 0, 0,6 0,7,08,69 0,8 4,44 3,60,4 0,7 Vanadium as V in µg/l,9 0,4 0,6 0,40 0,66 0,05 6,06 3,7,5 0,33 0,9 0,6 0,88,06 0,40,85 4,83,9 0,6 0,7,06 0,40 0,59 0,4 3 0,84 0, 0,89 0,86 0,0 0,9,9 0,59 0,69,78 0,39,9 Zinc as Zn in µg/l,55,87 0,7 0,56 0,69 0,88 0,5 0,0 0,40 0,4 0, 0,5 0,06 0,33,54,30 0,39 0,33 3, 3,0,84 0,77,40,6,6 0,83 0,95 0,7 0,9 0,96,4 0,06 0, 3 0,4, 0,0 0,65,60 0,35 3,05,50 0,5 0,7 0,90 0,44 0,65 0,35 Arsenic as As in µg/l 5 0,,57 0,,47, 4,7 4 0,80 0,0 0,5,8,8 6 0,43,46 0,8 0,79,59 4,83 Selenium as Se in µg/l 4 39,78 0,35 0,39 0,5 0,85 3,3 5 4,9 0,4 0,4 0,79 0,79 6 5,67 0,7,66 0,6 4,9 0,73

12 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE B ZSCORE VALUES Okt 07 GROUP Gr (cont) Page 9 of 3 Determinand B38 B39 B4 B4 B45 B49 B49B B63 B68 B69A B69B B69C B70 B7 B73 B74 B76 B78 B79 B8 B86 B88 B9 Aluminium as Al in µg/l,45,47 0,66,83 0,46 6,39,3 0,97,37 0, 0, 0,05 0,4 0,54 0,55 0,47 0,36 0,58,7 4,9 0,4 0,84,64 0,75 0,6 3 0,5,8,69,5 0,39 0,65 0,9 0,99,66 0,7 0,5 0,69 Barium as Ba in µg/l 0,94 0,9,36 0,7 0,30 0,60 0,4 0,50,5,6 0,8 3,4,4 0,56 0,8 0,08,0 0,,9 Beryllium as Be in µg/l 0,54,36,43,36,9 0,0 0,5 3,33,5,38 0,3 Boron as B µg/l 0,43 0,84,09 0,7 0,09,07 5,4,0,48,39 3 0,54 0,5,4,6,47 Cadmium as Cd in µg/l,05 3,03 0,5 0,8 0,45 0,06 0,97 0, 0,06,0,50 0,5,05,0 0,5,7,93,05,6 0,30 9,4 3 0,57 0,6 0,05,3 3,63,04 0,,4,4,8 0,99 Chromium as Cr in µg/l,7 0,5 5,8 0,76 0, 0,5 0,8 0,3 0,84,4 0,65 0,89 0,08 4, 0,5 0,60 0,08 0,56 0,48,4 0,0,6 3,8 3,58 0,80 0,3 0,5 0,35 0,8 0,65,53 0,35 0,45 0,74 Cobalt as Co in µg/l 4,8 0,8,00 0,08 0,47 0,5 0,8 0,0 0,83,0,37 0,75 3,77,6 0, 0, 0,39 0,59 0,94,50,8 0,6 3 4,4 0,9 5,30 0,9,0 0,9 0,48,,50,44 Copper as Cu in µg/l 0,76 0,55 0,80 0,08,6,0,39 0,4,8 0,7 0,40 0,7 0,08 0,4 0,9,09,,36,04,4 3,0,38 0,77,9,8 0,78 0,35 0,3 0,53 0,46 0,68 0,4 Iron as Fe in µg/l 0,58,03,09,55,58,3 0,7 0,0 0,0 0,7,6 0,77 0,84 0,60 0,65 0,3,06, 0,65,00,5 0,83 0,95 0,4 0,63 3,47,56 4,43 0,66 0,4 0,4,35 0,5 0,3,34 0,0,0 0,75 Lead as Pb in µg/l,0 0,86,48,6,8 0,09 0,6 0,57,84 0,0 0,8 0,49 0,5 0,3 0,8,07,35,64 3,8 0,3 0,3 0,56 0,46 3,08,67 0,58 0,35,0 0,0,63,9,33 0, 0,4 Manganese as Mn in,0 0,97 0,09 0,6,09 0,09 0,58 0,0 0,03,03,43 0,56,34,00 0,06 0,4,4 0,53,84 0,4 0,05 0,90,56,5 0,58 µg/l 3 0,37,5 0,3 0,0 0,8 0,6 5,4 0,4,5,03,00 0,6 Mercury as Hg in µg/l,80 0,33 5,8,34 0,36 3,0 4,90 0,3 Molybdenum as Mo in 5,73,7 0,9,99 0,6 0,88 0,54 0,58,6 0,3 0, 0,08 µg/l 3 6,63,,9,54,04 0,4 0,4 Nickel as Ni in µg/l,44,4 0,09 0,7 0,76 0,9 0,65 0,77 0,35 0,60 0,4 0, 0,8 0,0 0,44 0,8,00,57,63 0,84,5 0,46 0,8 3,07 0,7 0,75 0,5,57 0,87 0,7 0,6,9,78 0,6 0,5 Silicon as Si in µg/l 0,43 0,47 0,46 0,7 0,7 0,56 0,40 0,83 0,38 0,53 4,9 0,64 3 0,46 0,48 0,90 0,3 0,35 0,8 Strontium as Sr in µg/l 0,89,6 0,35 0,8, 0,86 0,35 0,3,8,94 0,9 0,5 0,08 0,06 3, 0,,8,4 0,8 0, Vanadium as V in µg/l,9 0,75 0,6 0,95 4,03 0,40 0,93 0,59 0,48 0,05,5, 0,53 3 0,9 3,0 0,89 0,9 0,0 0,4 Zinc as Zn in µg/l,87,44 0,3 0,60 0,44 0,35 0,9 0,0 0,0 0,05 0,7 0,0 0,60 0,7 0,96,0 0,77 0,60 0,64 0,95 3 0,9 0,4 0,65 0,5,55 0,7 0,8 0,3,0,0 0,5 Arsenic as As in µg/l 5 0, 0,,57 4 0,55,09 6 0, 0, Selenium as Se in µg/l 4,38 0,,5 5,6,55 0,08,86 6 0,36 0,43,00

13 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE B ZSCORE VALUES Okt 07 GROUP Gr (cont) Page 0 of 3 Determinand B93 B94 B99 B00 B0 B03 B04 B05 B07 B08 B09 B B3 B5 B6 B7 Ba Bc B3 B4 B5 B6 B7 B8 Aluminium as Al in µg/l 0,98 0,3 0, 0,56 6,73,48 0,68 0,60 0,09 0,69 0,84 0,09 0,0 0,37,85 4,33 0,5 0,3 0,5 0,0 3,86,3 0,05 0,44 0,7 0,7 0,4 0,8 0,8 Barium as Ba in µg/l 0,40 0,88,4 0,5 0,54 0,6 0,7 0,64 3 0,7,69 0, 0,73 0,06 Beryllium as Be in µg/l 0,54,0,75 0,30 0,38,36,56 3 0,09 0,09 0,56 0,75 Boron as B µg/l 0,5 0,87 0, 0,5 0,56 0,76 0,53 0,59,0 0,46 3 0,94 0,7 0,76 0,83 0,8 0,06 Cadmium as Cd in µg/l 0,45 0,30,6 0,85 0,0 0,5,50,45,0 0,60 0,3 0,30 0,03 0,0,35,6 0,60,53,85,,0 0,03 0,77 3 0,0 0,99 0,3,0,30 0,5 0,57,08,87,70,8 0,6,45 Chromium as Cr in µg/l,89 0,88 0,43 0,5 0,3 0,65,8 0,3 0,4 0,60 8,7 0,9 0,,4 0,06 0,75 0,0 0,37,4 3,08 0,5 0,03 9,3 0,55 0,39 3,6 0,5,58 0,06 0,7 0,4 0,4 0,5 0,89 0,06 5, 0,98,65 Cobalt as Co in µg/l 0,6 0,8 0,0 0,83 0,05 3,0 0,5,53 0,5 0,5 0,6 0,6 0,7 0,5 0,,39 0,33 0,9 0,94 0,37,94 0,50 3,06 0,48 0,55,5 0,0,6 0,58 0,37,54 0,75, 0,77 Copper as Cu in µg/l 0,5 0,46,48 0,5,6 0,30 0,5,0 0,69 0,08,35 0,79 0, 0,55 0,40 0,83 0,4 0,45 0,59 0,43,06 0,59 0,08 0,9 0,4 0,8 0,55 0,9,6 3 0,68 0,46,0,6 0,44,5 0,33 0,7,4,59 0,3 0, 0,87,9 Iron as Fe in µg/l,08 3,07 0,0 0,36,0 0,6 0,5 0,38, 0,3 0,50,53,09 3,7,7 0,,66 0,54 0,93 0,40 0, 0,6 0,7,4 0,3 0,35 3 3,33 0,55,94 0,40 0,0,33 0,7 0,65 0,0 0,83,70 0,09,3 0, Lead as Pb in µg/l,5 0,35 0,3 0,0 0,9 0,3 6,47 4,7 0,39 0,88 0,79 0,40 0,0 0,9 0,9,,66 0,60 0,39 0,66,95 3,03 9,57 3,4,44 0,59 0,73 0,3 0,33 3,8 0, 0,94 5,36 0,30,6 0,8 0,30 0, 0,33, 3,8 0,79 0,88,95 Manganese as Mn in 0,56,73 0,03,47 0,0,5,66 0,0 0,6 0,60,0 0,96 0,30 0,0 0,03,5 0,0 0,5 0,55 0,9,03,0 0,7,54 0,05,43 0,58 0,50 0,60 0,05 µg/l 3 0,65,47 0,37 0,79 0,45 0,6 0,5 0,48 0,05,03 0,89 0,85 0,8 0,73 Mercury as Hg in µg/l 46,7 34,9 0, 0, ,6 0, Molybdenum as Mo in 0,6 0,6 0,0 0, 0,55,3,35 0, 0,55 µg/l 3 0,9,37 0,45 0,49,7 Nickel as Ni in µg/l 0,84,45 0,0 0,06 0,5 0,35 0,35 0,87 0,65 0,7,99,6 0,79,3 0, 0,0,37 0,5 0,58 0,53,5,85 0,5 0,0 0,83,3 0,47 0,5 3,37,87 0,6 0,84 0,37 3,5 0,64,5 0,4,08,54 0,7 Silicon as Si in µg/l 0,46 0,76 0,8 0,0 0,46 0,9 0,36 0,45,3 4,84 5,69,0,55 3 0,4 0,0 0,55 0,44,67 5,,7 Strontium as Sr in µg/l,73,94 8,90 0,58 0,49 0,69,06 0,7 0,8,7 3,3 3 3,7 0,55 0,39 3,88 Vanadium as V in µg/l 0,59 0,4 0,33,04 0,69 0,78 0,33 0,4 3 0,6 0,4 0,7,4 Zinc as Zn in µg/l 0,39 0,4 0,58,0 0,7 0,39 0,9 0,37 0,9 0,98 0,50 0,4 0,77,60,00,0,08,7,63,54,49 8,85 9,85 3,04,70 0,5 0,8 3,0 0,65 0,5 0,6 0,80,0 0,70,5,0,33,,47 8,4 4,45 0,0 Arsenic as As in µg/l 5 0,8 55,88 4,53 38,3 0,0 6 0,90 0,06 0,56 Selenium as Se in µg/l 4 0,57 6,6 5 6,8 6 0,08 9,70

14 SOUTH AFRICAN BUREAU OF STANDARDS WATERCHECK PROGRAMME TABLE B ZSCORE VALUES Okt 07 GROUP Page of 3 Determinand B9 B30 B3 B3 A B3B B35 B38 B39 B4 B4 B43 B44 B47 B48 B49 B5 B53 Aluminium as Al in µg/l,8,34,68 0,7,68 0,7 0,8 0,95 0,58 0,9,9,6 0,98,67, 0,85,86,54 3,7,60,60 0,37,37 0, 0,5 0,06,85 Barium as Ba in µg/l 0,40 0,40,0,48,3,48,4 0,6 3 4,66 0,39 0,39,57 0,56,30 Beryllium as Be in µg/l,45,75 3,7 3,0,0 0,3 3 0,5 0,4 0,53 Boron as B µg/l,98,88 7,5 7,5,05,55,56 0,43 3 3,09 0,30 0,30 0,33,7 0, Cadmium as Cd in µg/l 3,5 3,9,55,05 0,64 0,30 0, 0,9,65,67 0,93 0,8 0,09 3 5,97 0,47,4 0,0 0,6,40 0,6 0,47 Chromium as Cr in µg/l 5,56 0,56,0,4 0,84,77 0,43,94 7,46 0,3,0,56,6,66 0,43 3,3 3 3,6 0,03,35 0,8,0 0,8 0,49,5 Cobalt as Co in µg/l 0,73,09,67 0,75 0,54,0 0,83 0,94,33,39 0,68,50 3 0,48,35,44,99 0,6 0,9 Copper as Cu in µg/l 4,09,6 0,38 0,4 0,84,9,3 0,83 0,3 4,06 0,40 0,96,0,7 3,60,63 0,86 3 3,7 0,09,04 0,37 0,3 0,60 0,64 0,78 Iron as Fe in µg/l 5,98 3, 4,5,70 0,09 0,55 0,09 0,55 0,59, 0,69, 0,4 3,9,36 0,3, 3 4,33 0,0,08,08 0,05,94 0,46 0,6 0,77,80 Lead as Pb in µg/l,4,85 0,30 0,4,5,66 0,03,30 0,03 0,4 0,79 0,55 0, 0,49 0,0,4 3,83 0,5,5 0,80 0,77 0,5 0,53 0,58 Manganese as Mn in µg/l 4,07 3,78 3,54,8 0,56 0,3 0,56 0,3 0,03 0,80 0,6 0,36,0,7 0,03,08,69,7,79 3 4,80,0 0,65 0,65,4 0,87,7 0,65,00 0,56 Mercury as Hg in µg/l 0,7 0,9 0,63 3 0,3 0,5 Molybdenum as Mo in µg/l 0,78 0,78 0,7 0,6,4,4 0,4,05 0,3 3,50,50 0,68 0,06 0,49 0,4 Nickel as Ni in µg/l 4,3 4,47 0,64 0,5,33 0,6,6 0,76,67 3,4 0,44 0,38 0,53 0,4 3 6,90 0,49 0,5,57,66 0,7 0,75 Silicon as Si in µg/l 3,6 3,89 0,74 3,69 0,74 3,69,7,0 0,43 0,09 3 3,57,04,04,09 0,35 Strontium as Sr in µg/l,97,90 0,49 0,49,35,43 0,89,3 0,35 0,06 3 3,76 0,84 0,84,8 0,6 0,79 0,79 Vanadium as V in µg/l 4,56,49 4,56,49 0,58,4 0,66,75 3,6 3,09,09 0,64 0,66 0,59 Zinc as Zn in µg/l,04,86,93,6 0,73 0,09 0,09,06,63 0,3 0,44 0,64 0,63,54,49 0,35 0,58 0,8 0,70 3,30,5 0, 0,5,80 0,75,5 0,, Arsenic as As in µg/l 5 0,8 4 0,0 0,45 6 0,56 Selenium as Se in µg/l 4 0,5,0 5 0,3 0,93 0,50 6 0,87 0,36

15 WaterCheck Summary Report October 007, Group Page of 3 Table C: Statistical summary Determinand Spike µg/l Median Robust SD n Lab code Average absolute z score Number of tests performed Aluminium as Al in µg/l Barium as Ba in µg/l Beryllium as Be in µg/l Boron as B µg/l Cadmium as Cd in µg/l Chromium as Cr in µg/l Cobalt as Co in µg/l Copper as Cu in µg/l Iron as Fe in µg/l Lead as Pb in µg/l Manganese as Mn in µg/l Mercury as Hg in µg/l Molybdenum as Mo in µg/l Nickel as Ni in µg/l Silicon as Si in µg/l Strontium as Sr in µg/l Vanadium as V in µg/l Zinc as Zn in µg/l Arsenic as As in µg/l Selenium as Se in µg/l 750,0 80, B, B3 0, ,0 57, B5 0, ,0 90, B7, ,0 488, B8 0, ,0 37, B9A 6, B0 0, ,0 50,0 7 5 BA 0, ,0 8, B4, ,0 54, B9, BA 4, BB 4,0 33 5,0 6,0 3 5 B, ,0 50, B3 0, ,0 4,0 9 5 B5 0, B30 0, B3 0, ,0 397, B33 0, ,0 397, B36 0, ,0 797, B38, ,0 95, B39, ,0 3, B4 0, B49, ,0 490, B49B, B63 0, B68, ,0 438, B69A 0, ,0 54, B7 0, ,0 586, B73, ,0 9, B74, ,0 70, B76 0, B86 0, ,0 493, B99,4 4 3,000, B00 0, ,000 8, B0 0, ,000, B03 8,9 5 00,0 89,7 4 9 B04 0, ,0 75, B05, ,0 88, B08 0, B09 0, B 0, ,0 554, B3 0, B6, Ba 3, B3, , B4, ,0 330, B8 0, ,0 55, B9 3, ,0 86,0 8 8 B3, ,0 399, B3 A, ,0 43, B3B, , B35 0, ,0 45, B38, , B4 0, ,000 4,45 3 B43,33 5 5,00 4,50 4 B48 0, ,000 8,835 B49 0, ,500 8, ,50 5, ,000 7, Z < = SATISFACTORY < Z < 3 = QUESTIONABLE * Z > 3 = UNSATISFACTORY * Note: A Zscore of an individual result > (questionable) should be investigated by the participating laboratory.

16 B38 B4 B43 B48 B49 B4 B9 B0 BA 3,00,00,00 WATERCHECK GROUP Page 3 of 3 October 007 Ave Abs ZScore (Figure ) B B3 B5 B30 B3 B33 B36 B38 B39 B4 B49 B49B B63 B68 B69A B7 B73 B74 B76 B86 B99 B00 B0 B03 B04 B05 B08 B09 B B3 B6 Ba B3 B4 B8 B9 B3 B3 A B3B B35 BA BB Lab Code B8 B9A B7 B5 B3 B ZScore Absolute Average

17 Sample Results Determinand Kjeldahl nitrogen as N in mg / l Total phosphate as P in mg / l Ammonia as N in mg / l Nitrate as N in mg / l Orthophosphate as P in mg / l Sample 007/ / * Results mg/ l Range mg/ l Method Reference 3 * Month: * * * Due date: 4 * * 4 * Enquiries: 5 * SABS Water Check Group 4 * Lab code: B Oxygen absorbed as O in mg / l Tel: Chemical oxygen demand as O in mg / l Dissolved organic carbon as C in mg / l Fax: * * 4 * 5 * Signed: Total organic carbon as C in mg / l Comments: NOTES:. Sample : Purified sewage effluent preserved with,5 ml / litre H SO 4 (conc).. * Dilution: Samples, 3, 4 and 5 are synthetic water samples. Dilute by pipetting 0 ml of the synthetic concentrate of samples,3,4 and 5 respectively into separate 000 ml volumetric flasks and dilute to volume with distilled/deionised water Use Grade A volumetric glassware. NB: Do not correct analytical results for these dilutions. 3. Testing: Please analyse by single test on a routine basis and express results as one decimal. 4. Ranges: The range values are only valid for the diluted synthetic samples. F5.9/04E 007/08