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  • ASTM
    D5074-90(2008) Standard Practice for Preparation of Natural-Matrix Sediment Reference Samples for Major and Trace Inorganic Constituents Analysis by Partial Extraction Procedures
    Edition: 2008
    $50.00
    Unlimited Users - 1 Loc per year

Description of ASTM-D5074 2008

ASTM D5074 - 90(2008)

Standard Practice for Preparation of Natural-Matrix Sediment Reference Samples for Major and Trace Inorganic Constituents Analysis by Partial Extraction Procedures

Active Standard ASTM D5074 | Developed by Subcommittee: D19.07

Book of Standards Volume: 11.02




ASTM D5074

Significance and Use

The objective of this practice is to provide guidelines for the preparation of stable, representative, oxidized, relatively unpolluted, aquatic natural-matrix bed-sediment reference test samples. When prepared as described, such test samples should be useful for collaborative methods testing, to evaluate the precision and bias of test methods, and to evaluate test methods performance during their development.

The availability of defined representative natural-matrix reference or test samples, closely approximating a variety of typical environmental samples, is a key requirement for the effective collaborative methods evaluation and development of test methods, and quality assurance testing. When the composition of the reference or test samples has been determined, either for operationally defined total recoverable leaching techniques, or for total analysis determined by total dissolution, the defined samples should also be suitable for analytical quality assurance testing.

Certified analyses of most rock, sediment, sludge, and soil reference samples are typically based on the total amount of each constituent of interest in the entire sample. Total chemical analysis of these samples generally requires complete decomposition or dissolution of the standard material. These are the only feasible analytical approaches if knowledge of finite concentrations for each element of interest in the entire sample is required. Certain instrumental methods, such as X-ray fluorescence or neutron activation analysis, may provide information as to the total constituent composition without sample destruction.

Partial chemical extraction of sediments, or total recoverable analyses (operationally defined procedures) for selecting constituents, frequently are useful for defining available constituent concentrations. In addition, partial chemical extractions may also provide data on partitioning, phase associations, or on how trace elements are entrained. Operationally defined extractable trace constituent concentrations are generally best obtained by using very specific reagent mixtures and extraction procedures, including method of mixing, vessel size and shape, extraction time, temperature, and so forth.

The various iron and manganese oxides and hydroxides, clay minerals, and organic solutes and particulates, that commonly occur as coatings on most oxidized sediment particles, are generally recognized as the controls governing the concentrations and distribution of most trace metals in natural water-sediment hydrologic environments. Anthropogenic sources clearly dominate in the number of sources and in total loading to most systems, although other factors may also be important. Under reducing conditions the iron and manganese oxide coatings, organic components, and associated trace metals may be resolubilized and remobilized. Migration of the reduced solubilized species, with possible subsequent formation of sulfides and so forth, and reoxidation and redeposition at some new location, may then occur. Analysis of extractable trace constituent concentrations in leachates obtained from reduced sediments thus will probably not be indicative of the trace constituent concentrations initially associated with the oxidized and coated sediment grains.

1. Scope

1.1 This practice covers uniform procedures to develop, select, collect, prepare, and use oxidized, relatively unpolluted, aquatic natural-matrix bed-sediment reference samples for the collaborative testing of chemical methods of analysis for sediments and similar materials. Reference samples prepared using this practice are intended for use as natural sediments, analyzable for major, minor, and trace elements, and general physical/organic analyses only. The samples are not designed or tested for environmental pollutants such as trace organic compounds.

1.2 Few, if any, aquatic sediment reference materials have been certified, defined, or are even available for developing or evaluating partial and sequential extraction procedures. This practice describes factors and considerations in site selection, sample characteristics, collection, and subsequent raw sample treatment needed to prepare natural-matrix bed-material sediments for use as partial or sequential extraction procedure reference test samples. The user of this practice is cautioned that in light of the many variables that may affect natural materials, neither the list of factors included for evaluation nor preparation of natural-matrix reference samples should be considered as all inclusive. It is the user's responsibility to ensure the validity and applicability of these practices for preparing specific-matrix samples appropriate for testing the constituents of interest and the operationally defined extraction procedures utilized.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1129 Terminology Relating to Water

D3974 Practices for Extraction of Trace Elements from Sediments

D3975 Practice for Development and Use (Preparation) of Samples for Collaborative Testing of Methods for Analysis of Sediments

D3976 Practice for Preparation of Sediment Samples for Chemical Analysis

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


Keywords

Aquatic natural-matrix bed-sediment reference samples; Collaborative testing; Inorganic chemical analysis--water; Inorganic compounds--water; Natural-matrix bed-sediment reference samples; Partial extraction procedures; Reference samples/specimens; Sampling water analysis applications; Sediment sampling; Specimen preparation (for testing)--water testing; Trace elements--water analysis


DOI: 10.1520/D5074-90R08

ASTM International is a member of CrossRef.

ASTM D5074

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