EPA Method 200.1


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EPA Method 200.1:
Trace Elements in Marine Waters by ICPMS. Official Name: Determination of Trace Elements in Marine Waters by On-Line Chelation Preconcentration and Inductively Coupled Plasma - Mass Spectrometry

Summary:
A sample is preconcentrated using an iminodiacetate functionalized chelating resin. Following acid solubilization, the sample is buffered prior to the chelating column using an on-line system which separates target elements from most anions and Group I and II metals upon elution with acid ammonium acetate. Analytes are eluted into a dilute nitric acid solution, and the concentration of elements is determined using a directly coupled on-line inductively coupled plasma-mass spectrometry (ICP-MS) system.

Scope:
The method determines total recoverable trace elements in marine waters, including estuarine water, seawater, and brines.

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

Interferences:
(A) Competing chelators: low recoveries may be encountered in the preconcentration cycle if the trace elements are complexed by competing chelators in the sample or are present as colloidal material. Acid solubilization pretreatment is employed to improve analyte recovery and to minimize absorption, hydrolysis, and precipitation effects.(B) Memory interferences: especially after analyzing a sample containing high concentrations of the analytes. A thorough column rinsing sequence following elution of the analytes is necessary to minimize such interferences.

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.

Media:
WATER

Subcategory:
Inorganic

Precision:
Precision and accuracy values were calculated using data from 3 replicate analyses of a fortified certified seawater sample (NASS-2). All samples had measured background concentrations of analytes of interest. Consult the method for background concentrations and additional data.

Detection:
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 1.6, September 1997

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