EPA Method 218.3

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EPA Method 218.3:
Chromium by Chelation Extraction and Flame AA. Official Name: Chromium (Atomic Absorption, Chelation-Extraction)

Summary:
This method is based on the chelation extraction of hexavalent chromium with ammonium pyrrolidine dithiocarbamate (APDC) following oxidation of trivalent chromium. The chelate is extracted with methyl isobutyl ketone (MIBK) and is analyzed using a flame atomic absorption spectrometer. Specifications for instrument operation and preparation of standards are provided.An alternative extraction is also described in EPA Method 200.0, Section 9.2, which uses pyrrolidine dithiocarbamic acid in chloroform.

Scope:
This method determines total chromium in drinking, surface and saline waters, and certain domestic and industrial wastes (provided that no interferences are present).

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
Reactive Metals: High concentrations of other reactive metals, as may be found in wastewaters, may interfere (but not at levels normally found in fresh water).For additional interferences see EPA Method 200.0.

QC Requirements:
QC requirements for drinking water procedures are provided in method 200.0

Maximum Holding Time:
6 months (MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
1-25 ug/L.

Sample Prep:
200

Precision:
Precision and accuracy data are not available.

Detection:
-

Revision Number:
Issued 1978