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Arsenic Recovery Study
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An Arsenic recovery study was undertaken by ITS research laboratory in April of 2008 using the Ultra Low QUICK II test kit (part number 481300), which require 500 ml samples per analysis. Each 500 ml water sample was tested for the presence of arsenic; and then a 500 ml water sample was spiked with 3.0 ppb arsenic standard (150ul of 10 ppb Arsenic/L) and retested to determine percent recovery. The analysis of color was done by QUICK Arsenic Scan (part number 481305) with Scan Value determined; and by Visual matching using Easy Read color chart. Per cent recovery was calculated for Scan Value Recovery only. The ideal would be to have a spiked recovery of 100%. Data below from spiked samples show approximate recovery of +/- 20 % recovery for the spiked samples. All water tested was found to be below the US EPA MCL (Maximum Containment Level) of 10 ppb (ug/L). Precision claims for this test are +/- 0.4 ppb or 12% when run in duplicate. Since samples were not done in duplicate the accuracy claims are not verified in this study. One exception was when duplicates were run for Las Vegas water which confirmed minor interference using the Ultra Low QUICK II test kit with recovery at 73%. This is the only sample that showed less then 80% recovery. The 125% recovery for Edmonton water sample could not confirmed because of the lack of sample. Click here to go to the product page for Arsenic Ultra Low Quick™ II (481300). |
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| Tap Water Source | Arsenic Analysis
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Spiked Arsenic Recovered
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Vienna, Austria Toronto, Canada New Orleans, Louisiana Durham, North Carolina Phoenix, Arizona Las Vegas, Nevada** Minneapolis, Minnesota Chicago, Illinois Rock Hill, South Carolina Banff, Canada Edmonton, Canada Rockwell, North Carolina* Edgewater, Maryland* |
0.07 0.12 0.12 0.09 0.21 0.25 0.09 0.10 0.07 0.09 0.11 0.07 0.06 |
BDL 0.3 ppb 0.3 ppb BDL 1.2 ppb 1.5 ppb BDL BDL BDL BDL 0.2 ppb BDL BDL |
0 ppb <0.3 ppb 0.3 ppb 0 ppb 1 ppb 1.5 ppb 0 ppb <0.3 ppb 0 ppb 0 ppb 0.3 ppb 0 ppb 0 ppb |
0.38 0.44 0.43 0.37 0.49 0.44 0.38 0.36 0.40 0.41 0.47 0.44 0.44 |
2.6 ppb 3.3 ppb 3.0 ppb 2.5 ppb 4.5 ppb 3.3 ppb 2.6 ppb 2.4 ppb 2.8 ppb 2.8 ppb 4.0 ppb 3.3 ppb 3.3 ppb |
87% 100% 91% 83% 107% 73% 87% 80% 93% 93% 125% 110% 110% |
3 ppb 3.5 ppb 3.5 ppb 2.5 ppb 5 ppb 3.5 ppb 3 ppb 2.5 ppb 3.5 ppb 3 ppb 3.5 ppb 3.5 ppb 3.5 ppb |
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| *Untreated Well Water | **Results are mean of duplicate analysis | |||||||||||||
