Determination of Hexavalent Chromium in Soil by HPLC/ICP-MS
Chromium primarily exists as either trivalent or hexavalent forms. Cr+3 is a vital nutrient and Cr+6 is a toxin. As a result of the Cr+3 / Cr+6 differences, a total chromium analysis cannot provide a complete toxicity assessment.
Hexavalent chromium is used in a number of industrial processes (e.g.,steel production, chrome plating, and metal working) and is categorized as
known a carcinogen. These anthropogenic sources expose individuals to hexavalent chromium by breathing contaminated air, ingesting or inhaling contaminated soils or by drinking contaminated water. It is important to monitor and determine the environmental impact of the industries’
generation of hexavalent chromium in the environment to assess pollution and prevent health hazards.
There is a need for environmental certified reference materials for the study of hexavalent chromium. High-Purity Standards has developed
certified reference materials within the scope of ISO 17025 for hexavalent chromium in soil and sludge. The soil/sludge certified reference materials were manufactured by spiking and homogenizing the soil with hexavalent chromium salts. Varying levels of salts were spiked to represent samples that could be found in a contaminated environment.
The chromium species were separated isocratically using HPLC ionpair chromatography. An isocratic separation was accomplished using
tetrabutlyammonium hydroxide (TBAH) as the mobile phase. Dynamic reaction cell ICP-MS was the detection method. To account for the
interconversion of Cr+3 and Cr+6, a chromium speciation kit from Applied Isotope Technologies, Inc. was employed.
High-Purity Standards has proudly served the scientific community for the past twenty years with high quality spectrometric standards and reference materials for AAS, ICP, ICP-MS, GC, GC-MS and IC, and has now expanded their stocked reference materials to include ISO Guide 34 multi-component organic reference materials.
Approximately one-half of High-Purity Standards business is in the preparation of custom blends and difficult to prepare special mixtures. In addition, they have expanded their Organics lab. It's now bigger and better to meet increased demand.
New products of note include expanded spiked filter products in addition to organic reference materials designed to meet EPA testing requirements and additional products from customer requests.
High Purity Certified Reference Standards are supplied by Greyhound Chromatography, 6 Kelvin Park, Birkenhead, Merseyside, CH41 1LT Tel: +44 (0) 151 649 4000 Fax: +44 (0) 151 649 4001 Email: info@greyhoundchrom.com
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