Full Description

The performance of several commercially available field test kits for arsenic wasevaluated and compared to standard graphite furnace atomic absorptionspectrophotometry (GFAA). Performance was determined by precision, accuracy,linearity, operator bias, matrix effects and "ease of use". Precision and accuracy weredetermined for arsenic III, arsenic V, and a combination of species. Precision wasrelatively good for all test kits as determined by standard deviation. Accuracy however,calculated through percent recoveries, varied greatly among test kits. Three test kitsproduced percent recoveries of greater than 75%. However, the other four test kitsproduced poor percent recoveries as defined by the authors (50 to 66%). Matrix effectswere evaluated using additions of known interferences of sulfide and antimony in reagentwater. Field samples were also tested at various concentrations to determine performancethroughout the working range of the field test kits, defined as linearity. All field kitswere relatively free from operator bias. Four test kits were determined to be relativelyeasy to use, or have a high "ease of use" score. Two of the field test kits met all thefollowing criteria; easy to use, no operator bias, inexpensive, accurate and precise. Includes 12 references, tables, figures.

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Edition: Vol. - No. Published: 11/15/2004 Number of Pages: 14File Size: 1 file , 740 KB