NEMI Method Summary

Method Summary Information

Method Number: I-7900 Media: WATER
Revision: 1972
Method Source: U.S. Geological Survey (USGS)
Subcategory: INORGANIC Analytes in this method
Official Name: Zinc, atomic absorption spectrometric, direct
Descriptive Name Zinc, suspended recoverable, atomic absorption spectrometric
Source Info: USGS Branch of Information Services
Box 25286, MS 417
Federal Center
Denver, CO 80225-0286
Phone: 303-202-4700
Citation: USGS Methods, Volume A1
122203 Byte file
Brief Method
Summary:
 Zinc is determined by atomic absorption spectrometry by direct aspiration of the sample into an air-acetylene flame. The procedure may be automated by the addition of a sampler and either a strip-chart recorder or a printer or both.
Scope And
Application:
 This method may be used to analyze water and water-suspended sediment containing from 10 to 500 ug/L of zinc. Sample solutions containing more than 500 ug/L need to be diluted or to be read on a less expanded scale.
Suspended-recoverable zinc is calculated by subtracting dissolved zinc from total recoverable zinc.
Applicable
Conc Range:
 NA
Interferences: Magnesium at concentrations greater than 100 mg/L interferes unless other cations, such as sodium, are present in the sample.
Individual concentrations of sodium, potassium, sulfate, chloride (9,000 mg/L of each), calcium (4,500 mg/L), nitrate (2,000 mg/L), iron (4 X 106 ug/L), and cadmium, nickel, copper, lead, cobalt, and chromium (10,000 ug/L each) do not interfere. Greater concentrations of each constituent were not investigated.
Samples containing 100 mg/L of silica cause no interference; however, zinc recovery is approx. 10 percent low in samples containing 200 mg/L of silica.
QC Requirements: No QC requirements. Suspended recoverable zinc is a calculation.
Sample Handling: NA
Max Holding Time:
 NA
 
Relative Cost: Less than $50
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