NEMI Method Summary


Method Summary Information

Method Number:

I-1137

Media:

WATER

Revision:

1985

Method Source:

U.S. Geological Survey (USGS)

Subcategory:

INORGANIC

Analytes in this method

Official Name:

Cadmium in Water by Graphite Furnace Atomic Absorption Spectrometry

Descriptive Name

Cadmium dissolved in Water by GFAA

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

116939

Byte file

Brief Method
Summary:

Cadmium is determined by atomic absorption spectrometry in conjunction with a graphite furnace containing a graphite platform. A sample is placed on the graphite platform and a matrix modifier is added. The sample is then evaporated to dryness, charred, and atomized using high-temperature ramping. The absorption signal generated during atomization is recorded and compared with standards.

Scope And
Application:

This method may be used to determine cadmium in low ionic-strength water and precipitation.

Applicable
Conc Range:

0.02 - 1.0ug/L* (*0.1 - 3.0ug/L with Zeeman background correction.)

Interferences:

(1) Low concentrations of cadmium at sample collection and lab determination can cause contamination. (2)Interferences such as precipitation in low ionic-strength samples is low.

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: 250 mL Polyethylene bottle, acid-rinsed.
Treatment and Preservation: Use unfiltered sample to rinse bottles. Then acidify collected sample with HNO₃ to pH < 2.

Max Holding Time:

Relative Cost:

$51 to $200

4759

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Method Summary Information