USGS-NWQL: I-7381:  Iron, water, suspended recoverable by FLAA

  • Summary
  • Analytes
  • Revision
  • Data and Sites
Official Method Name
Iron, atomic absorption spectrometric, direct
Current Revision
1985
Media
WATER
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
Suspended recoverable iron is calculated by subtracting dissolved iron from total recoverable iron.
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 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.
Maximum Holding Time
180 days
Relative Cost
Less than $50
Sample Preparation Methods