Mercury Vapour Monitoring with the MVI. By Peter Childs

Transcription

1 Mercury Vapour Monitoring with the MVI By Peter Childs

2 What is Mercury? Mercury is a metal that exists in liquid form at room temperature Mercury is a toxic substance Metallic mercury will evaporate at room temperature. Because it divides into tiny globules, spillages present an enormous surface area from which evaporation takes place

3 Bacharach MV2- to MVI UK DHSS demanded a more sensitive instrument with 0.1 micron/m3 resolution. MV2 not able to offer sensitivity better than 10 micron/m3 Mercury spillage into baby incubators from damaged thermometers had been identified! Every incubator must be tested. Over 5000 across the UK

4 MVI Operation Switch On and allow the instrument to run until you see a stable reading This should happen after 3-4 minutes when operating in the range Allow 10 minutes before operating in the range

5 MVI Range of Measurement The MVI has two manually switched ranges 0-200ug/m3 with 0.1ug resolution ug/m3 with 1ug resolution

6 MVI Operation As soon as the reading is stable you can zero the instrument If you are in clean fresh air, rotate the zero adjust control knob

7 MVI Operation Carbon Zero Filter If you suspect you are in an area contaminated with mercury, connect the charcoal filter to the inlet of the MVI. Then rotate the zero adjust control knob.

8 MVI Data Logger

9 MVI Data Logger

10 MVI Data Logger.

11 MVI Applications Monitor environments where mercury or mercury compounds are produced, processed or stored or present Wherever mercury vapour may pose a health hazard to personnel and livestock

12 Mercury in the Environment Landfills Recycling facilities Fluorescent tubes Ore Extraction Gold Chemical Production Chlor Alkali

13 Mercury in the Environment Cement Production Gauge manufacture and repair Mercury switches Housing & Urban renewal Thermostats etc Coal & Cement stacks for CEM Universities, Schools, Hospitals & Laboratories Rechargeable Batteries Refineries

14 MVI Interferences The MVI operates on the principle of UV light absorption. There are substances that are known to interfere including various hydrocarbons, water vapour, sulphur compounds and smoke particles

15 MVI Interferences Approximate readings when exposed to a 100ppm concentration; Benzene Toluene Acetone Ethyl Alcohol Ethyl Acetate 20 ug/m3 3.5 ug/m3 3.0 ug/m3 6.0 ug/m3 3.0 ug/m3

16 Real Time Field Mercury Monitors Arizona Instruments Jerome Gold Film Product Line Ohio Lumex Competitors Cold Vapor Atomic Absorption ION MVI Double Beam UV absorbance

17 Jerome J405

18 Jerome J405

19 Jerome J405

20 Jerome J405 Some pricing.. US$ Rental Rate Daily $176 Weekly $501 Monthly $1,430 Purchase $10,720

21 Real Time Mercury Monitors AZI Jerome Gold Film Product Line Pros Portable Lightweight Cons - Downtime guaranteed Limited Range Saturates and Requires regeneration in normal operation

22 Ohio Lumex 915P

23 915P FEATURES AND BENEFITS direct detection of mercury without preliminary accumulation on a gold trap ultralow mercury detection limit in air (2 ng/m3) in real-time operation mode wide dynamic quantification measuring range ( mg/m3)

24 915P Specs RA-915+ (air) 460x210x110 mm 7.5 kg ~220/110 V, 50/60 Hz; 15 W dc 10/14 V *

25 915P Daily Rental $ Weekly Rental $1, Monthly Rental $4, Replacement Cost $25,000.00

26 Real Time Mercury Monitors Ohio Lumex Cold Vapor Atomic Absorption Pros Most Sensitive Fewer interferences Cons Heavy, not really portable Over-ranges in normal operation

27 MVI

28 MVI Features: Dual beam UV absorption technology No saturation, no regeneration eliminates instrument downtime Fast, 3 second response Range: 0.1 to 200 and 1.0 to 1999 microgram/cubic meter Highly accurate measurement Continuous readings High performance pump for fast indication and recovery PTFE probe with moisture trap filter Large digital display Simple, one-handed operation Audible Alarm can be set to any level or switched off Robust portable and fixed options available Optional 4-20mA available

29 MVI Technical Specifications DETECTOR Dual Beam Ultraviolet Absorption Module ACCURACY ± 5 micrograms or ± 10% reading OPERATION After warm up MVI gives real time mercury vapor concentrations ALARM Audible Alarm Factory pre-set to 25 microgram/cubic meter INSTRUMENT RANGE 0.1 to 200 and 1.0 to 1999 microgram/cubic meter TEMPERATURE 10 oc to 50 oc WEIGHT & DIMENSIONS 6 lbs 10 oz (3Kgs) 145 x 295 x 80 mm REPEATABILITY ±5% 1 μg/m3 BATTERIES NiMH - last up to 8 hours from full charge RESPONSE TIME = 3 seconds

30 Real Time Mercury Monitors ION MVI Double Beam UV absorbance Pros Lightweight Fast Sensitive Wide range No regeneration Cons Some minor interferences

31 Real Time Mercury Monitors Ranges J-405: ug/m3 J-431: ug/m3 MVI: ug/m ug/m3 Lumex ug/m3 OSHA /MSHA TWA 50 ug/m3, STEL150 ug/m3

32 Real Time Mercury Monitors Value Proposition: ION MVI Double Beam UV Sensitivity and range: Exposure Limits + Spills Productivity Lightweight + No Regeneration + Fastest Cost Less than Jerome much less than Lumex

33 Questions?