Simple Inorganic Arsenic Testing
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The document discusses the prevalence of arsenic in water across the United States and highlights the EPA's regulations and testing options for arsenic levels. It details the operation of an arsenic testing kit that converts inorganic arsenic into arsine gas, allowing for the detection of arsenic in water samples, and outlines the test procedure step-by-step. Additionally, it addresses the reliability and verification of the kit's performance by independent organizations and emphasizes the use of appropriate reagents to ensure safety and accuracy during testing.
Simple Inorganic Arsenic Testing
- 1. Arsenic Field Testing Made Easy By Ivars Jaunakais / Industrial Test Systems, Inc. Wednesday, March 7th WQA 2012 1:00 – 1:30 pm
- 2. About Arsenic Ø 49 of the 50 states have reported finding arsenic in water Ø EPA lowered the MCL (maximum containment level) to 10ug/L (PPB) Ø Testing for arsenic below 10ug/L can be done by an analytical lab or by an on-site test kit quickly and accurately
- 3. How our Arsenic Kit works Ø Reduces inorganic arsenic (trivalent and pentavalent arsenic) in an acidic aqueous sample to arsine gas Ø Excess hydrogen gas is generated, which facilitates the passage of the arsine gas through the reaction test strip which forms a yellow color in the presence of arsine directly proportional to the arsenic level
- 4. How our Arsenic Kit works Ø The reduction in all these kits utilizes zinc and includes the following reactions: As4O6 + 12 Zn +24H+ → 4AsH3(gas) + Zn2+ + 6H2O and Zn +2H+ → Zn2+ + H2 (gas)
- 5. How the Ultra Low Arsenic Quick II Kit works Ø Tartaric acid is used to replace hydrochloric or sulfuric acids to remove hazardous reagents Ø The analysis is done with a 500 ml sample in a closed reaction bottle (plastic), which minimizes arsine gas hazards.
- 6. Ultra Low Arsenic Quick II Kit #481300 Ø The kit was assessed for reliability for on-site Arsenic water testing. Ø EPA / ETV Test Verified Performance Information on the performance characteristics of QuickTM can be found at www.epa.gov/etv, or call ITS at 1-800-861-9712 for a copy of the ETV verification report. The use of the ETV® Name or Logo does not imply approval or certification of this product nor does it make any explicit or implied warrantees or guarantees as to product performance.
- 7. Test procedure for the Ultra Low Arsenic Quick II STEP 1 Ø For best results, the water temperature should be between 22°C to 28°C. Use a thermometer to verify the temperature of the sample. Ø To the Reaction Bottle, slowly add the water sample to the marked line on the bottle (500mL).
- 8. Test procedure for the Ultra Low Arsenic Quick II STEP 2 Ø Add 2 level pink spoons of first reagent (tartaric acid with iron and zinc catalysts) to the reaction bottle. Cap securely with the black cap and shake vigorously for 15 seconds.
- 9. Test procedure for the Ultra Low Arsenic Quick II STEP 3 Ø Uncap the reaction bottle and add 2 level red spoons of the second reagent (MPS which oxidizes sulfide)
- 10. Test procedure for the Ultra Low Arsenic Quick II STEP 4 Ø Recap securely with the black cap and shake vigorously up and down for 15 seconds. Allow to sit for 2 minutes (this allows oxidation of sulfide).
- 11. Test procedure for the Ultra Low Arsenic Quick II STEP 5 Ø Prepare the turret cap as follows: Open the packet and carefully remove the strip. Avoid touching the Mercuric Bromide testing pad. Position the testing pad over the orifice and press down the turret handle over the pad until it locks into position on the cap.
- 12. Test procedure for the Ultra Low Arsenic Quick II STEP 6 Ø Uncap the Reaction Bottle and add 2 level white spoons of the Third Reagent (Zinc dust). Recap securely with the black cap and shake vigorously for 5 seconds.
- 13. Test procedure for the Ultra Low Arsenic Quick II STEP 7 Ø Remove the black cap from the Reaction Bottle and recap securely using the turret cap with strip. Incubate for ten (10) minutes
- 14. Test procedure for the Ultra Low Arsenic Quick II STEP 8 Ø After 10 minutes pull the turret up. Use the Color Chart (Quick™ Ultra Low II) and match the color of the exposed side of the testing pad within 2 minutes.
- 16. Test procedure for the Ultra Low Arsenic Quick II Ø The Quick™ Scan Test Pad Reader can be used as an alternative for determining the color intensity on the test strip.
- 19. Other Arsenic Kits Available
- 20. ETV PERFORMANCE Ø For information on the performance of our Arsenic kits visit: www.epa.gov/etv
- 21. ENDORSEMENTS Ø Independent verification of our kits in the December 2006 AWWA journal “Quick II kits will be most applicable for water utilities and contracted vendors responsible for monitoring the influent and effluent arsenic concentrations of POU devices”
- 22. ENDORSEMENTS Ø Honored by the Water Environmental Federation (WEF) as an 2003 Innovative Technology Award winner
- 23. TEST KIT PERFORMANCE IN A LAB Ø Analysis will provide good results in a Laboratory setting Ø A lab is a controlled environment where Reagent stability is assured Ø Recalibration of test kit reagents or kit performance can be easily confirmed
- 24. TEST KIT ON-SITE PERFORMANCE (Challenges) Ø Test kits and instruments on-site operate under different environmental conditions Ø Customer home or business can have a great deal of affect on results and operator Ø Distractions like noise and activity Ø For some tests (especially Liquid reagents) stability is affected by elevated Temperature in transport vehicle Ø On-site precise results are a challenge Ø Easy, non-technical procedures are desirable
- 25. Questions? Industrial Test Systems, Inc. www.sensafe.com