标准编号：ISO 21268-3:2019
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3部分：上向渗透试验
英文名称：Soil quality — Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil-like materials — Part 3: Up-flow percolation test
发布日期：2019-09
标准范围
This document specifies a test, which is aimed at determining the leaching behaviour of inorganic
and organic substances from a soil and soil-like materials. The method is a once-through up-flow
percolation test under standardized conditions of flow rate. The material is leached under dynamic
hydraulic conditions. The document has been developed to measure the 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 test results enable the
distinction between different release patterns, for instance wash-out and release under the influence of
interaction with the matrix, when approaching local equilibrium between material and leachant.
This test method produces eluates, which can subsequently be characterized by physical, chemical and
ecotoxicological methods in accordance with existing standard methods. The results of eluate analysis
are presented as a function of the liquid/solid (L/S) ratio. The test is not suitable for substances that are
volatile under ambient conditions.
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 also meant to include genotoxicological testing.
NOTE 5 The test is generally not suitable for soils with hydraulic conductivities below 10−8 m/s (see also
Annex B). It can be difficult to maintain the designated flow rate already in the range of saturated hydraulic
conductivity between 10−7 m/s and 10−8 m/s.
The application of this test method alone is not sufficient for the determination of the leaching
behaviour of a material under specified conditions different to those from the test procedure, since this
generally requires the application of several test methods, behavioural modelling and model validation.
This document does not address issues related to health and safety. It only determines the leaching
properties as outlined in Clause 4.
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