Thermo Fisher Scientific Collaborates with US EPA to Improve Holding Time and MDLs for Chromate in Drinking Water
Thermo Fisher Scientific Inc. is pleased to announce that its participation in the secondary validation of US EPA Method 218.7 for hexavalent chromium, Cr(VI), in processed drinking water is complete.
Cr(VI) is a toxic compound regulated by the EPA for certain wastewaters. The need for a high-sensitivity method was triggered after review of the
US EPA Toxicological Review of Hexavalent Chromium, when some states
and localities began to lower the actionable level of chromate in
drinking water. The new method:
Scientists of Thermo Fisher Scientific have been participating in a collaborative project with the EPA Office of Ground Water and Drinking Water in Cincinnati to improve the holding time and sensitivity of US EPA Method 218.6 per the company's Application Update 144. The new method for processed drinking water is 218.7 as per Application Update 179, which demonstrates 1 part per trillion (ppt) detection of chromate using 2 mm anion-exchange columns (Thermo Scientific Dionex IonPac AS7) using one of the company's Reagent-FreeTM Ion Chromatography systems.
The sensitivity as shown in AU179 permits a method detection limit (MDL) for chromate of 0.001 µg/L, resulting in a quantitation limit of 0.003 µg/L. This sensitivity is more than sufficient for chromium speciation analysis at newly proposed levels, such as that proposed by the Office of Environmental Health Hazard Assessment (OEHHA) at the California EPA, which recently issued a new public health goal (PHG) lowering the actionable level of chromate in drinking water to 0.02 µg/L (ppb).
Source: adapted from Thermo Fisher Scientific, SunnyVale, CA, Dec. 9, 2011 Application Note DIONEX Application Update 179: Sensitive Determination of Hexavalent Chromium in Drinking Water Instruments used for this application note Dionex ICS-1100 Basic Integrated IC System Dionex ICS-1600 Standard Integrated IC System Dionex ICS-2100 Integrated Reagent-Free IC System Dionex ICS-3000 Reagent-Free™ Ion Chromatography System Dionex ICS-5000 Capillary Reagent-Free IC System Related information DIONEX/Thermo Fisher Scientific: Hexavalent Chromium Thermo
Scientific: #40837: The Determination of Trivalent and Hexavalent
Chromium in Mineral and Spring Water using HPLC Coupled to the XSeriesII
ICP-MS with CCT OEHHA: Hexavalent Chromium in Drinking Water OEHHA: Hexavalent Chromium Public Health Goal for Drinking Water CDPH: Chromium-6 in Drinking Water Sources: Sampling Results Environmental Working Group: Cancer-causing Chromium (VI) Pollution in U.S. Tap Water EPA: Recommendations for enhanced monitoring for Hexavalent Chromium (Chromium-6) in Drinking Water Related EVISA Resources Link page: All about chromium Link Database: Legislation for Chromium in Drinking Water Link Database: Toxicity of Chromium Link Database: Analytical Methods for Chromium Speciation Material Database: Standards and Reference Materials for Chromium Speciation Analysis Brief summary: LC-ICP-MS: The most often used hyphenated system for speciation analysis
Related News EVISA News, July 31, 2011: California sets goal for limiting hexavalent chromium in drinking water EVISA News, May 26, 2011: Oral ingestion of hexavalent chromium through drinking water and cancer mortality EVISA News, January 19, 2011: EPA Issues Guidance for Enhanced Monitoring of Hexavalent Chromium in Drinking Water EVISA News, November 7, 2010: US EPA offers chance to speak out against hexavalent chromium EVISA News, September 15, 2010: EPA accuses chromium industry of withholding lung cancer study June 12, 2010: Chromium(VI) much more toxic than chromium(III): At least for freshwater algae a paradigm to revise? EVISA News, May 17, 2007: Hexavalent Chromium in Drinking Water Causes Cancer in Lab Animals
EVISA News, June 8, 2006: Scientific journal adds fuel to ongoing chromium debate
last time modified: January, 26, 2012