Analysis of Hexavalent Chromium in Drinking Water According to EPA Method 218.7

User Benefits

- Analysis of hexavalent chromium by EPA Method 218.7 can be successfully achieved in less than 6 min with Shimadzu Nexera lite inert. - Performance achieved is suitable for the selective and accurate quantification of Hexavalent Chromium in the low µg/L range. - Hexavalent chromium can be chromatographically separated from potential interferences and selectively detected using post- column derivatization.

Introduction

Chromium is a widely used metal in steel making, paints, etc. The most common forms of chromium are trivalent chromium, hexavalent chromium and metallic chromium. Total chromium, which includes hexavalent and trivalent forms is regulated by the United States Environmental Protection Agency (EPA) in wastewater and drinking water. However, in julio 2011, the Office of Environmental Health Hazard Assessment (OEHHA) at the California issued a new Public Health Goal (PHG) value of 0.02 μg/L for hexavalent chromium in drinking water. Therefore, the new EPA Method 218.7 is necessary. In EPA Method 218.7, the hexavalent chromium is separated by an anion exchange column. The colored complex formed between hexavalent chromium and 1,5-diphenylcarbazide in the post- column derivation is then detected at 530nm. Compared to EPA Method 218.6, the sample injection volume is larger, and a lower detection limit is obtained. This application news introduces an example of hexavalent chromium analysis of drinking water in accordance with EPA Method 218.7 by Shimadzu Nexera lite inert system.

27 de febrero de 2024 GMT