NEMI Method Summary

Method Summary Information

Method Number: I-7425 Media: WATER
Revision: 1985
Method Source: U.S. Geological Survey (USGS)
Subcategory: INORGANIC Analytes in this method
Official Name: Lithium, atomic absorption spectrometric, direct
Descriptive Name Lithium, suspended recoverable, 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
137991 Byte file
Brief Method
Summary:
 Lithium is determined by flame atomic absorption spectrometry by direct aspiration of the sample solution into an air-acetylene flame (Fishman and Downs, 1966).
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:
 Suspended recoverable lithium is calculated by subtracting dissolved lithium from total recoverable lithium. Prepared sample solutions containing more than 1,000 ug/L need either to be diluted or to be read on a less expanded scale. Total recoverable lithium in water-suspended sediment needs to undergo preliminary digestion-solubilization by method I-3485.
Applicable
Conc Range:
 10 ug/L to 1000 ug/L
Interferences: The following elements interfere when the indicated concentrations are exceeded: sodium, 1,000 mg/L; potassium, 100 mg/L; magnesium, 200 mg/L; calcium, 200 mg/L; chloride, 1,000 mg/L; sulfate, 2,000 mg/L; nitrate, 100 mg/L; and strontium, 5,000 ug/L.
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
Sample Handling: Container Descriptions: 250 mL Polyethylene bottles, acid-rinsed.
Treatment and Preservation: Use unfiltered sample to rinse bottle, then acidify collected sample with HNO3 to pH <2. For second sample, filter through 0.45-um filter, use filtered sample to rinse containers and acidify sample with HNO3 to pH < 2.
Max Holding Time:
 180 days
Sample Prep Met I-3485
Relative Cost: Less than $50
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