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A New Cation-Exchange Method for Accurate Field Speciation of Hexavalent Chromium

Water-Resources Investigations Report 2003-4018

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Abstract

A new cation-exchange method for field speciation of Cr(VI) has been developed to meet present stringent regulatory standards and to overcome the limitations of existing methods. The new method allows measurement of Cr(VI) concentrations as low as 0.05 micrograms per liter, storage of samples for at least several weeks prior to analysis, and use of readily available analytical instrumentation. The sensitivity, accuracy, and precision of the determination in waters over the pH range of 2 to 11 and Fe concentrations up to 1 milligram per liter are equal to or better than existing methods such as USEPA method 218.6. Time stability of preserved samples is a significant advantage over the 24-hour time constraint specified for USEPA method 218.6.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A New Cation-Exchange Method for Accurate Field Speciation of Hexavalent Chromium
Series title:
Water-Resources Investigations Report
Series number:
2003-4018
Edition:
-
Year Published:
2003
Language:
ENGLISH
Description:
17 p.