EPA Method 200.12

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EPA Method 200.12:
Trace Elements in Marine Waters by GFAA. Official Name: Determination of Trace Elements in Marine Waters by Stabilized Temperature Graphite Furnace Atomic Absorption

A sample is refluxed with nitric acid and then centrifuged or particulate is allowed to settle. An aliquot of treated sample is transferred to a stabilized temperature platform graphite furnace atomic absorption (STPGFAA) system. The aliquot is dried at a low temperature, charred/ashed to remove interferences, atomized, and concentrations of atomized elements are determined using a STPGFAA spectrophotometer.

This method determines total recoverable elements in marine waters, including estuarine, ocean, and brines with salinites of up to 35 ppt.

Methods for Determination of Chemical Substances in Marine and Estuarine Matrices - 2nd Edition (EPA/600/R-97/072)

(A) Blackbody radiation: Emission of blackbody radiation from the oven can interfere with absorbance measurements.(B) Elemental interferences: Spectral overlap of elemental absorptions can occur, but are relatively uncommon. Appropriate furnace temperature programs and high purity lamps can reduce interferences.(C) Molecular interferences: More common than elemental interferences, they can be reduced by using matrix modifiers, selective volatilization, background correctors, and appropriate furnace charring conditions. Note: The correct charring temperature is critical when analyzing saline waters.(D) Matrix interferences: Some matrix components can inhibit the formation of free atoms.(E) Memory interferences: Analyte can carry over in the furnace between runs. Use low concentration samples to ensure that analytes do not carry over.(F) Specific element interferences: Cadmium, selenium, and arsenic have characterized interferences and suggested interference removal procedures.

QC Requirements:
Initial demonstration of laboratory capability and the periodic analysis of laboratory reagent blanks, fortified blanks, and other laboratory solutions as a continuing check on performance.

Maximum Holding Time:
6 months.



Not Provided

Precision and accuracy values were calculated using data from 4 replicate analyses of a fortified certified seawater sample (NASS-3). Additional data are available in the method.

MDL procedure is equivalent to the procedure at 40 CFR part 136, Appendix B. MDLs were determined using the standard deviation of 7 replicate analyses of a analyte-fortified reagent water sample multi

Revision Number:
Revision 1.0, September 1997