BS 7755-3.9:1995 Soil quality. Part 3. Chemical methods - Section 3.9. Extraction of trace elements soluble in aqua regia
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This International Standard specifies a method for the
extraction, with aqua regia, of trace elements from
soils and similar materials, prepared according to
ISO 11464, and containing less than about 20%
(m/m) organic carbon according to ISO 10694. Ma-
terials containing more than about 20 % (m/m) organic
carbon will require treatment with additional nitric acid
(see note 8). The resulting solution is suitable for the
determination of trace elements using appropriate
atomic spectrometric techniques. With high solute
concentrations in extract solutions, spectral inter ferences
and background enhancement should be expected.
NOTE 1 Aqua regia will not totally dissolve most soils and
similar materials, and the efficiency of extraction for par-
ticular elements differs from element to element. Such ef-
ficiency might also differ for the same element in different
matrices. Users of this International Standard should carry
out a programme of analysis using reference materials to
assure themselves that the method given here is appropri-
ate for their needs. Elements extractable in aqua regia can-
not, therefore, be decribed as "totals"; conversely they
cannot be regarded as the "bio-available" fraction, as the
extraction procedure is too vigorous to represent any bio-
logical process.
Primary Item Type:
British Standard
Identifiers:
ISBN 0580246957
ICS 13.080.10 Chemical characteristics of soils
Language:
English
Subject Keywords:
Safety measures; Metals; Quality; Aqua regia; Solvent extraction methods; Soil testing; Soil science; Chemical analysis and testing; Test equipment; Soils; Trace element analysis
