Advanced Water Quality Sensing and Optimisation Group Christopher Saint, Christopher Chow, David Davey, Stan McLeod

Transcription

1 Advanced Water Quality Sensing and Optimisation Group Christopher Saint, Christopher Chow, David Davey, Stan McLeod Selected Projects involving the Microstill SA Water Centre for Water Management and Reuse University of South Australia 1

2 Advanced Water Quality Sensing and Optimisation Group has used a range of Sensor s in its research Electrodics Voltammetry Conductance Near Infrared UV-vis 2

3 Selected Projects involving the Microstill Wine Analysis Nitrogen Species Cyanide The Microstill S. McLeod, Anal. Chim.Acta, 226 (1992)107. 3

4 Sulfite in Wine The Rankine/Pocock Method 20 ml wine and 10 ml excess acid are placed in a distillation flask A 1 litre/min air stream is passed through the solution at room temperature to determine free SO 2 The Air/ SO 2 stream is collected for 15 minutes in a peroxide receiving solution Peroxide oxidises H 2 SO 3 to H 2 SO 4. The analysis is completed by NaOH titration Bound S (IV) The still solution is boiled, the SO 2 collected and the analysis repeated 4

5 The Microstill Air Sample + Reagent IN 15cm Distillate OUT 30 minutes 2 minutes 5

6 Free Sulfite- Microstill Method Rankine White Wine Red Wine Microstill White Wine Red Wine mg/l Sulfite Wine No. 6

7 Fermentation Monitoring Sensors selected Temperature ph Redox ORP Conductance Oxygen Additional Measures Alcohol Sugars NIR Acetic acid Colour Alcohol by Microstill 7

8 Fermentation Data Sensors & Microstill 20 O 2 mg/l ph Redox mv Temp. 0C Microstill % Alcohol. 0 Day 14 8

9 Fermentation Near IR Data Scans for every 2nd day Day Day 10 Day nm Day 6 Day 4 Day Day Day Day Day Day Day nm Day nm nm

10 Near IR data trends %v/v Day Alcohol Glucose Fructose Acetic 10

11 Nitrogen Species in Natural Waters Ammonia toxic to fish farms, aquariums Nitrite can cause asfixia in children Nitrate causes eutrification and algal growth in combination with ammonia 21/02/ Adv WQ Sensing and Optim'n Group

12 Ammonium- N measures - ppb mv minutes

13 Microstill ISE v Colorimetry Microstill & ISE Color NH 3 in mg/l Sample No. 13

14 0.4 Chloramine + NH Water Disinfection Studies Ammonia & Chloramine Conductance Detection NH3-N mg/l No Treatment + Ascorbate., + Chlorine NH3 0 Time (min.) 21/02/ Adv WQ Sensing and Optim'n Group

15 Cyanide and Gold Mine Tailings Sample Acid Air N2 Waste UV Lamp HCN Quartz coil 21/02/ Adv WQ Sensing and Optim'n Group

16 CN Recovery for Metal Complexes under N2 with UV exposure 110 Co Ni Ag Fe(II) Fe(III) 100 % Recovery CN [H+] M 21/02/ Adv WQ Sensing and Optim'n Group

17 Interferences with CN Analysis Sulfur Species Interference % Decrease in CN SO3 2- SO3 2- w ith UV S 2- S 2- w ith UV mg S per litre 17

18 ppm CN Cyanide and Gold Mine Tailings Why we are interested in Ammonia? Comparison of Total CN Methods Disinfection Chloramination Ammonia Analysis Techniques Water Industry Microstill 6 Collection and Conductance Detection of Ammonia Laboratory 2 Study & Distribution System Case Study 1 0 Polar HPLC ISE Color Skalar Microstill Soil Nos A B C D E UniSA Laboratory 21/02/ Adv WQ Sensing and Optim'n Group 4 5 6

19 The Microstill is a valuable addition to the analytical toolbox It efficiently separates volatile analytes from their matrix The overall process becomes more selective Sensitivity can be improved through collecting and concentrating the distilled analyte 19

20 Thank you for your attention 20