EPA Method 200.13

Summit Environmental Technologies prides itself in its expansive testing capabilities in a variety of different fields. To find out if Summit conducts this test, contact us at 330-253-8211 today.

PDF IconView Actual EPA Method 200.13 (PDF File)

EPA Method 200.13:
Trace Elements by GFAA (w/ Preconcentration). Official Name: Determination of Trace Elements in Marine Waters by Offline Chelation Preconcentration with Graphite Furnace Atomic Absorption

A sample is refluxed with nitric acid to solubilize elements. The solubilized sample is buffered using an on-line system, and is then preconcentrated using a chelating column with an iminodiacetate functionalized chelating resin. Anions and Group I and II metals are eluted from the column with ammonium acetate. The elements of interest are then eluted into a dilute nitric acid matrix. The concentrations of elements in the matrix are measured using a graphite furnace atomic absorption (GFAA) system.

This method determines total recoverable elements in marine waters, including estuarine water, sea water, and brines.

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) Matrix interferences: Some matrix components can inhibit the formation of free atoms.(D) Memory interferences: Analyte can carry over in the furnace and in the chelating columns between runs. Use low concentration samples to ensure that analytes do not carry over.(E) Loss of analyte: Low recoveries may be encountered if the sample contains chelating agents (humic/fulvic) or colloids that compete with the chelation column. Acid solubilization of the sample minimizes this interference.

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 four replicate analyses of fortified certified seawater (NASS-3).

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 an analyte-fortified reagent water sample multiplied by the t-value for 6 degrees of freedom at the 99% confidence level (3.14). Detailed instructions for how MDLs are determined are found in Section 9.2.4 of the Method.

Revision Number:
Revision 1.0, September 1997