USGS-NWQL: I-1381: Iron, dissolved in water by FLAA
|
Official Method Name
|
Iron, atomic absorption spectrometric, direct |
|---|---|
|
Current Revision
| 1985 |
|
Media
|
WATER |
|
Instrumentation
|
Flame Atomic Absorption |
|
Method Subcategory
|
Inorganic |
|
Method Source
|
|
|
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 water containing at least 10 ug/L of iron. Sample solutions containing more than 1,000 ug/L need either to be diluted or to be read on a less expanded scale. |
|
Applicable Concentration 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. |
|
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: 250 mL Polyethylene bottle, acid-rinsed. Treatment and Preservation: Filter through 0.45-um filter, use filtered sample to rinse containers and acidify sample with HNO3 to pH < 2. |
|
Maximum Holding Time
|
180 days |
|
Relative Cost
|
Less than $50 |
|
Sample Preparation Methods
|
