NEMI Method Summary

Method Summary Information

Method Number: I-5135 Media: VARIOUS
Revision: Revised 1985
Method Source: U.S. Geological Survey (USGS)
Subcategory: INORGANIC Analytes in this method
Official Name: Cadmium, atomic absorption spectrometric, direct
Descriptive Name Cadmium, recoverable-from-bottom-material, various, FLAA
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
14291 Byte file
Brief Method
Summary:
 Cadmium is determined by atomic absorption spectrometry by direct aspiration of the sample into an air-acetylene flame without preconcentration or pretreatment of the sample.
Scope And
Application:
 This method may be used to analyze water and water-suspended sediment containing at least 10 ug/L of cadmium. Sample solutions containing more than 250 ug/L need either to be diluted or to be read on a less expanded scale. Sample solutions containing less than 10 ug/L need to be analyzed by the atomic absorption spectrometric chelation-extraction method, providing that the interference limits discussed in that method are not exceeded.
This method may be used to analyze bottom material containing at least 1 ug/g of cadmium.
Total recoverable cadmium in water-suspended sediment needs to undergo preliminary digestion-solubilization by method I-3485, and recoverable cadmium in bottom material needs to undergo preliminary digestion-solubilization by method I-5485 before being determined.
Applicable
Conc Range:
 > 1 ug/g
Interferences: Individual concentrations of sodium (9,000 mg/L), potassium (9,000 mg/L), magnesium (4,500 mg/L), sulfate (9,000 mg/L), chloride (9,000 mg/L), nitrate (100 mg/L), iron (4 X 106 ug/L), and cobalt, nickel, copper, zinc, lead, and chromium (10,000 ug/L each) do not interfere. Greater concentrations of each constituent were not investigated.
Calcium at concentrations greater than 1,000 mg/L suppresses the cadmium absorption. At 2,000 mg per liter of calcium, the suppression is approximately 19 percent.
QC Requirements: Calibrate instrument using calibration standards (CAL). Quality control samples (QCS) and laboratory blanks (LB) analyzed at a minimum of I each after every 10 samples. (Reference OFR 95-443).
Sample Handling: Container Description: 500 mL Polypropylene bottle, wide-mouth.
Treatment and Preservation: No treatment, preservation or special shipping requirements.
Max Holding Time:
 180 days
Sample Prep Met I-5485, P-0520
Relative Cost: Less than $50
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