NOAA NST: 140.0:  Trace metals in marine sediment by GFAA

  • Summary
  • Analytes
  • Revision
  • Data and Sites
Official Method Name
Graphite furnace atomic absorption for analysis of trace metals in marine sediments.
Current Revision
March 1998
Media
SOILS/SEDIMENT
Instrumentation
Graphite Furnace-Atomic Absorption Spectrometer
Method Subcategory
Inorganic
Method Source
  NOAA NST
Citation
Sampling and Analytical Methods of the National Status and Trends Program Mussel Watch Project: 1993-1996 Update.
NOAA Technical Memorandum NOS ORCA 130. March 1998. Silver Spring, MD. 233pp.
Brief Method Summary
Sample preparation and analysis methods have been developed and refined that allow accurate and precise determination of major and trace elements in sediment samples. Sample preparation emphasizes homogenization and total digestion steps that minimize contamination. Analysis includes a full suite of quality assurance samples (emphasis on certified reference materials) in order to produce reliable data. These methods allow measurement of both background and elevated concentrations within NOAA's Status and Trends Program, permitting subtle temporal and spatial differences to be detected.
Scope and Application
This method measures trace metals (at ug / g concentrations) in marine sediments.
Applicable Concentration Range
0.1-1000.0
Interferences
Spectral interferences may be minimized by sample dilution, use of an alternate analyte wavelength, or selective volatilization of the analyte. Non-spectral interferences may be detected and compensated for using the method of standard additions.
Quality Control Requirements
The quality assurance / quality control requirements are initial calibration and continuing calibration checks, method blank analysis, surrogate compound analysis, matrix spike analysis, and reference sample analysis.
Sample Handling
Sediments are obtained with a grab sampler that collects the top 2 cm of surface sediment. Sample aliquots are weighed, freeze-dried for approximately 5 days to constant weight in 125-mL polystyrene Spex jars in a freeze dryer, and reweighed to determine percent dry weight. Approximately 3 g are ground for 5 min using a Spex ceramic ball mill.
Maximum Holding Time
6 months (frozen)
Relative Cost
$201 to $400
Sample Preparation Methods
NOAA TM #130