NEMI Method Summary

Method Summary Information

Method Number: D3557A Media: WATER
Revision: 1995
Method Source: ASTM International
Subcategory: INORGANIC Analytes in this method
Official Name: Standard Test Methods for Cadmium in Water
Descriptive Name Cadmium, Method A: Atomic Absorption, Direct
Source Info: ASTM International
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Citation: ASTM Volume 11.01
 
Brief Method
Summary:
 Cadmium is determined by atomic absorption spectrophotometry. Dissolved cadmium is determined by aspirating a portion of the filtered sample directly with no pretreatment. Total recoverable cadmium is determined by aspirating the sample following hydrochloric-nitric acid digestion and filtration.
Scope And
Application:
 This test method covers the determination of dissolved and total recoverable cadmium in most waters and wastewaters. It is applicable in the range from 0.05 to 2.0 mg/L of cadmium. The range may be extended to concentrations greater than 2.0 mg/L by dilution of the sample This test method has been used successfully with reagent grade water, river water, wastewater, ground water, tap water, lake water, and refinery effluent.
Applicable
Conc Range:
 0.05 - 2.0 mg/L (AA, Direct); 5 - 200 ug/L (AA, Chelation-Extraction); 1 - 100 ug/L (Differential Pulse Anondic Stripping Voltammetry); 2 - 10 ug/L (AA, Graphite Furnace)
Interferences: Calcium concentrations above 1000 mg/L suppress the cadmium absorption. At 2000 mg/L of calcium the suppression is 19 %. Sodium, potassium, sulfate, and chloride (9000 mg/L each), magnesium (4500 mg/L), iron (4000 mg/L), nitrate (100 mg/L), and nickel, lead, copper, zinc, cobalt, and chromium (10 mg/L each), do not interfere. Background correction or a chelation-extraction procedure (see Test Method B) may be necessary to determine low levels of cadmium in some waters.
QC Requirements: See ASTM Practice D3919
Sample Handling: Collect the samples in accordance with the applicable ASTM standard as follows: Practices D 3370, Practice D 1066, and Specification D 1192. Samples shall be preserved with HNO3 (sp gr 1.42) to a pH of 2 or less immediately at the time of collection, normally about 2 mL/L of HNO3. If only dissolved cadmium is to be determined, the sample shall be filtered through a 0.45-mm (No. 325) membrane filter before acidification.
Max Holding Time:
 The holding time for samples may be calculated in accordance with Practice D 4841.
 
Relative Cost: $201 to $400
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