标准编号：ISO 21268-4:2019
中文名称：土壤质量 土壤和类土材料的后续化学和生态毒理学试验的浸出程序 第4部分：初始酸碱添加对pH值的影响
英文名称：Soil quality — Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil-like materials — Part 4: Influence of pH on leaching with initial acid/base addition
发布日期：2019-10
标准范围
This document specifies a test to obtain information on the short- and long-term leaching behaviour
and characteristic properties of materials.
The document has been developed to measure the pH-dependent release of inorganic and organic
substances from soil and soil-like material as well as to produce eluates for subsequent ecotoxicological
testing. For ecotoxicological testing, see ISO 15799 and ISO 17616. The equilibrium condition, as defined
in this document, is established by the addition of predetermined amounts of acid or base to reach
desired final pH values.
NOTE 1 Volatile organic substances include the low molecular weight substances in mixtures such as mineral oil.
NOTE 2 It is not always possible to optimize test conditions simultaneously for inorganic and organic
substances and optimum test conditions can also vary between different groups of organic substances. Test
requirements for organic substances are generally more stringent than those for inorganic substances. The test
conditions suitable for measuring the release of organic substances will generally also be applicable to inorganic
substances.
NOTE 3 Within the category of organic substances, a significant difference in behaviour exists between the
more polar, relatively water-soluble compounds and apolar, hydrophobic organic substances (HOCs). In the latter
case, mechanisms of release (e.g. particle-bound or dissolved organic carbon-bound) can be more crucial as well
as sorption losses of soluble HOCs on different materials with which they come in contact (e.g. bottles, filters).
The test and the results should be used for leaching of organic substances only with thorough consideration of
the specific properties of the substances in question and the associated potential problems.
NOTE 4 For ecotoxicological testing, eluates representing the release of both inorganic and organic substances
are needed. In this document, ecotoxicological testing is meant to include genotoxicological testing.
The test method produces eluates, which can subsequently be characterized by physical, chemical and
ecotoxicological methods in accordance with existing standard methods. The test is not suitable for
substances that are volatile under ambient conditions.
For the purposes of ecotoxicological tests, the relevant pH range (see 8.2) will usually be pH 5 to pH 9.
This test is mainly aimed at being used for routine and control purposes, and it cannot be used alone
to describe all leaching properties of a soil. Additional leaching tests are needed for that extended goal.
This document does not address issues related to health and safety. It only determines the leaching
properties outlined in Clause 5.
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