Two sample-processing methods (field speciation and laboratory speciation) used at the USGS National Water Quality Laboratory (NWQL) are specific to sample analysis by inductively coupled plasma-mass spectrometry (ICP-MS) for determining the concentration of inorganic and organic arsenic species in a water sample. The field-speciation method requires NWQL Schedule 1729. The laboratory-speciation method requires use either of NWQL Schedule 1730, 1731, or 1732, as appropriate for study objectives. For either the field- or laboratory-speciation method, prior knowledge is needed of sample matrix-composition characteristics (that is, major-ion concentrations in filtered samples). Major-ion data are necessary to determine (1) the volume of ethylenediaminetetraacetic acid (EDTA) that will be required for sample preservation, and (2) if sample dilution is required.
|Title||Chapter A5. Section 6.4.A. Arsenic Speciation|
|Authors||John R. Garbarino|
|Publication Subtype||USGS Numbered Series|
|Series Title||Techniques of Water-Resources Investigations|
|Record Source||USGS Publications Warehouse|
|USGS Organization||U.S. Geological Survey|