NEMI Method Summary

Method Summary Information

Method Number: D1976 Media: WATER
Revision: 1996
Method Source: ASTM International
Subcategory: INORGANIC Analytes in this method
Official Name: Standard Test Method for Elements in Water by Inductively-Coupled Argon Plasma Atomic Emission Spectroscopy
Descriptive Name Elements in Water by ICP-AES
Source Info: ASTM International
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Citation: ASTM Volume 11.01
 
Brief Method
Summary:
 Elements are determined, either sequentially or simultaneously, by inductively-coupled argon plasma optical emission spectroscopy. A background correction technique may be used to compensate for variable background contribution from high concentrations of major and trace elements.
Scope And
Application:
 This test method covers the determination of dissolved, total-recoverable, or total elements in drinking water, surface water, domestic, or industrial wastewaters. Table 1 lists elements for which this test method applies, with recommended wavelengths and typical estimated instrumental detection limits using conventional pneumatic nebulization. Actual working detection limits are sample dependent and as the sample matrix varies, these detection limits may also vary. In time, other elements may be added as more information becomes available and as required.
Applicable
Conc Range:
 Varies with element
Interferences: Several types of interference effects may contribute to inaccuracies in the determination of trace elements. These interferences can be summarized as follows: A) Spectral interferences can be categorized as (1) overlap of a spectral line from another element; (2) unresolved overlap of molecular band spectra; (3) background contribution from continuous or recombination phenomena; and (4) background contribution from stray light from line emission of high concentration elements. B) Physical interferences are generally considered to be effects associated with the sample nebulization and transport processes. Such properties as change in viscosity and surface tension can cause significant inaccuracies, especially in samples that may contain high dissolved solids or acid concentrations, or both. C)Chemical interferences are characterized by molecular compound formation, ionization effects, and solute vaporization effects.
QC Requirements:
Sample Handling: Collect the samples in accordance with Practice D 1066 or D 3370 or Specification D 1192, as applicable. Preserve the samples by immediately adding nitric acid to adjust the pH to 2 at the time of collection. Normally, 2 mL of HNO3 is required per litre of sample. If only dissolved elements are to be determined, filter the sample through a 0.45-um membrane filter before acidification.
Max Holding Time:
 The holding time for the sample may be calculated in accordance with Practice D 4841.
 
Relative Cost: $201 to $400
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