You are here:
AN ENVIRONMENTAL TECHNOLOGY VERIFICATION (ETV) TESTING OF A TRACEDETECT'S SAFEGUARD METALS ANALYZER FOR ARSENIC
Citation:
BATTELLE MEMORIAL INSTITUTE, A. GREGG, T. KELLY, Z. WILLENBURG, A. DINDAL, AND K. RIGGS. AN ENVIRONMENTAL TECHNOLOGY VERIFICATION (ETV) TESTING OF A TRACEDETECT'S SAFEGUARD METALS ANALYZER FOR ARSENIC. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-06/098 (NTIS PB2006-115764), 2006.
Impact/Purpose:
The overall objective of the ETV Program is to accelerate the entrance of new environmental technologies into the domestic and international marketplace by identifying the environmental performance characteristics of commercial-ready technology through the evaluation of objective and quality assured data. This provides the potential purchasers and permitters with an independent and credible assessment of what they are buying and/or permitting. The AMS Center has received funding to performance verify monitoring technologies relevant for homeland security.
Description:
The TraceDetect's SafeGuard is designed to automatically measure total arsenic concentrations in drinking water samples (including raw water and treated water) over a range from 1 ppb to over 100 ppb. Once the operator has introduced the sample vial and selected "measure" on the control computer, all calibrations, dilutions, reductions, standard additions, and measurements are automatically performed by the SafeGuard with the results displayed and logged in a data file. The SafeGuard consists of three main components: the expert system, the fluidics system, and TraceDetect's patented NanoBand - sensor and potentiostat. Each of these components has a part in the measurement process from controlling the pumps, to adding chemicals, to making measurements and interpreting the results, minimizing the effort and expertise required to make trace metal measurements of this type with high precision. The SafeGuard uses anodic stripping voltammetry (ASV) and the method of standard addition to make metals measurements. The ASV is an electro-analytical method that detects ions in a solution by the potential at which they oxidize and strip away from the surface of an electrode. The SafeGuard is able to measure As (III) and reduce As (V) to As (III) to measure total arsenic. The SafeGuard automatically stores data for every measurement and operation.