Method E 7199
Hexavalent Chromium
Scope
This method provides procedures for the determination of hexavalent chromium in drinking water, groundwater, and industrial wastewater effluents. Samples containing high levels of anionic species such as sulfate and chloride may cause column overload. Samples containing high levels of organics or sulfides cause rapid reduction of soluble Cr(VI) to Cr(III).
An aqueous sample is filtered through a 0.45 um filter and the filtrate is adjusted to a pH of 9-9.5 with a concentrated buffer solution. A measured volume of the sample (50-250 uL) is introduced into the ion chromatograph. A guard column removes organics from the sample before the Cr (VI), as CrO4 2- , is separated on a high capacity anion exchange separator column. Post-column derivatization of the Cr (VI) with diphenylcarbazide is followed by detection of the colored complex at 530 nm.
-SW-846 Online: Test Methods for Evaluating Solid Waste, Physical/Chemical Methods
Method Data
| Method 6020 | |
|---|---|
| Hold Time | |
| Preservation | |
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| Collection Method | |
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| Method Reference |
Analyte Test
| Analyte | Formula | CAS Number |
|---|---|---|
| Hexavalent Chromium | Cr 6+ |
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