NEMI Method Summary

Method Summary Information

Method Number: I-7381 Media: WATER
Revision: 1985
Method Source: U.S. Geological Survey (USGS)
Subcategory: INORGANIC Analytes in this method
Official Name: Iron, atomic absorption spectrometric, direct
Descriptive Name Iron, water, suspended recoverable by 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
161794 Byte file
Brief Method
Summary:
 Iron is determined by atomic absorption spectrometry by direct aspiration of the sample solution 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:
 Suspended recoverable iron is calculated by subtracting dissolved iron from total recoverable iron.
Applicable
Conc Range:
 10 to 1,000 ug/L
Interferences: Individual concentrations of sodium, potassium, chloride, and sulfate (5,000 mg/L each), calcium and magnesium (1,000 mg/L each), nitrate (100 mg/L), chromium, manganese, cobalt, nickel, copper, zinc, silver, cadmium, tin, lead, lithium, mercury, selenium, aluminum, antimony, arsenic, vanadium, boron, and molybdenum (1 X 105 ug/L each) do not interfere. Greater concentrations of each constituent were not investigated.
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. Also need a filtered sample through 0.45-um filter, use filtered sample to rinse containers and acidify sample with HNO3 to pH < 2.
Max Holding Time:
 180 days
 
Relative Cost: Less than $50
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