EPA Method 1632

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EPA Method 1632:
Chemical Speciation of Arsenic in Water and Tissue. Official Name: Chemical Speciation of Arsenic in Water and Tissue by Hydride Generation Quartz Furnace Atomic Absorption Spectrometry.

Summary:
After collection, an aliquot of water sample or tissue digestate is placed in a specially designed reaction vessel to which 6M HCl is added, followed by the addition of 4% NaBH4. Arsines are purged from the sample onto a cooled glass trap where they are then thermally desorbed into an inert gas stream that carries them into an atomic absorption spectrophotometer for detection.

Scope:
This method determines inorganic arsenic (IA), arsenite (Ar+3), arsenate (As+5), monomethylarsonic acid (MMA), and dimethylarsinic (DMA) in filtered and unfiltered water and in tissue.

Citation:
EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

Interferences:
(A) Glassware contamination: Thoroughly clean glassware prior to use.(B) Reagent contamination: Use high quality reagents.(C) Contamination by carryover: May occur when a sample containing low concentrations of As is processed immediately after a sample containing relatively high concentrations of As. Rinse sample introduction system between samples with a dilute acid and reagent water.(D) Contamination by samples: Samples containing high concentrations should not be permitted into the clean room and laboratory dedicated for processing trace metal samples.(E) Contamination by indirect contact: Every piece of apparatus directly or indirectly used in the collection, processing, and analysis of water and tissue samples should be thoroughly cleaned.(F) Contamination by airborne particulate matter: Sample processing and analysis should occur as far as possible from sources of airborne contamination such as dust, dirt, particles, vapors, corroded or rusted pipes, wires, or metal-containing paint.(G) Water vapor may condense in the transfer line if it is not well heated, interfering with the determination of DMA.

QC Requirements:
The minimum requirements include an initial demonstration of laboratory capability, analysis of samples spiked with As and/or As species to evaluate and document data quality, and analysis of standards and blanks as tests of continued performance.

Maximum Holding Time:
28 days (aqueous samples).2 years (tissue samples).

Media:
VARIOUS

Subcategory:
Inorganic

Concentration:
0.01-50 ug/L in water.0.10-500 ug/g dry weight of tissue.

Sample Prep:
None.

Precision:
-

Detection:
MDL determined by the procedure in 40 CFR Part 136, Appendix B.

Revision Number:
Revision A, August 1998