ISO/TS 21268-4:2007 Soil quality - Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil materials - Part 4: Influence of pH on leaching with initial acid/base addition
International Organization for Standardization (ISO)
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ISO/TS 21268-4:2007
Scope
This part of ISO/TS 21268 specifies a test method to obtain information on the short- and long-term leaching
behaviour and characteristic properties of materials.
It applies to the determination of the influence of pH on the leachability of inorganic and organic constituents
from soil and soil material, and the ecotoxicological effects of eluates with respect to microorganisms, fauna
and flora. The test is not suitable for constituents that are volatile under ambient conditions. The equilibrium
condition, as defined in this part of ISO/TS 21268, is established by the addition of predetermined amounts of
acid or base to reach desired final pH values.
The test procedure specified in this part of ISO/TS 21268 produces eluates that are subsequently
characterized by physical, chemical and ecotoxicological standard methods.
For the purposes of ecotoxicological tests, the relevant pH range (see 9.2) will usually be pH 5 to 9.
NOTE 1 Volatile organic constituents include the low molecular weight components in mixtures such as mineral oil.
NOTE 2 It is not always possible to optimize test conditions simultaneously for inorganic and organic constituents and
optimum test conditions may also vary between different groups of organic constituents. Test requirements for organic
constituents are generally more stringent than those for inorganic constituents. The test conditions suitable for measuring
the release of organic constituents will generally also be applicable to inorganic constituents.
NOTE 3 For ecotoxicological testing, eluates representing the release of both inorganic and organic contaminants are
needed. In this document, ecotoxicological testing is meant to include genotoxicological testing.
This test cannot be used alone to determine the total leaching behaviour of a soil. More leaching tests are
needed for that extended goal. This part of ISO/TS 21268 does not address issues related to health and
safety. It only determines the leaching properties outlined in Clause 5.
ISO/TS 21268-4:2007 history
2007ISO/TS 21268-4:2007 Soil quality - Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil materials - Part 4: Influence of pH on leaching with initial acid/base addition