USGS-NWQL: I-5381: Iron, recoverable-from-bottom-material, dry wt, FLAA

Summary
Analytes
Revision
Data and Sites

Official Method Name

Iron, atomic absorption spectrometric, direct

Current Revision

1985

Media

SOILS/SEDIMENT

Instrumentation

Flame Atomic Absorption

Method Subcategory

Inorganic

Method Source

USGS-NWQL

Citation

Methods for the Determination of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A1 Edited by Marvin J. Fishman and Linda C. Friedman

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

This method may be used to analyze bottom material containing at least 1 ug/g of iron. Prepared sample solutions containing more than 1,000 ug/L need either to be diluted or to be read on a less expanded scale.
Recoverable iron in bottom material needs to undergo preliminary digestion-solubilization by method I-5485 before being determined.

Applicable Concentration Range

at least 1 ug/g

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.

Quality Control 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 Description: 500 mL Polyethylene bottle, wide-mouth. Treatment and Preservation: No treatment, preservation or special shipping requirements.

Maximum Holding Time

180 days

Relative Cost

Less than $50

Sample Preparation Methods

I-5485

This method has 1 analyte associated with it.

Analyte	Detection Level	Bias	Precision	Pct False Positive	Pct False Negative	Spiking Level
Iron(7439-89-6) Fe Iron	1.000 ug/g	N/A	N/A

Precision Descriptor Notes:	It is estimated that the percent relative standard deviation for total recoverable iron in bottom material will be greater than that reported for dissolved iron.
Detection Level Note:	It is estimated that the percent relative standard deviation for total recoverable iron in bottom material will be greater than that reported for dissolved iron.

Revision	PDF/Link
1985

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USGS-NWQL: I-5381: Iron, recoverable-from-bottom-material, dry wt, FLAA

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