ISO 21268-1:2019
Soil quality — Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil-like materials — Part 1: Batch test using a liquid to solid ratio of 2 l/kg dry matter
Soil quality — Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil-like materials — Part 1: Batch test using a liquid to solid ratio of 2 l/kg dry matter
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 27
- Дата публикации:
- 4 сентября 2019 г.
- Издание:
- ISO IS 21268 edition 1 version 1
- ICS:
- 13.080.05
This document specifies a test providing information on leaching of soil and soil-like materials under the experimental conditions specified hereafter, and particularly at a liquid to solid ratio of 2 l/kg dry matter. 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[6] and ISO 17616[7]. 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 optimise 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. This 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. This procedure is not applicable to materials with a dry-matter-content ratio lower than 33 %. 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 as outlined in Clause 4.
Abstract
Overview - ISO 21268-1:2019 (Soil quality: batch leaching test, L/S = 2 l/kg)
ISO 21268-1:2019 defines a standardized batch leaching procedure for assessing the release of inorganic and organic substances from soil and soil-like materials at a liquid-to-solid ratio (L/S) of 2 l/kg dry matter. The method produces eluates (leachates) suitable for subsequent chemical, ecotoxicological and genotoxicological testing and is intended mainly for routine and compliance control purposes. It is not suitable for substances volatile at ambient conditions or for materials with dry-matter content below 33%.
Key topics and technical requirements
- Scope and purpose: Produces eluates for chemical and ecotoxicological characterization under specified experimental conditions (L/S = 2 l/kg).
- Sample preparation: Laboratory/sample pretreatment, particle size (maximum grain size commonly <2 mm), and determination of dry matter content per ISO 11465.
- Leachant: Options include specified eluents; demineralized water is explicitly permitted.
- Test procedure: Preparation of the eluent, controlled contact (batch leaching), liquid/solid separation (filtration or centrifugation), and further eluate preparation for analysis.
- Analytical requirements: Chemical and ecotoxicological analyses of eluates, with blank tests and reporting requirements.
- Limitations & considerations:
- Not optimized simultaneously for all organic and inorganic groups; organic substances (especially HOCs) can require more stringent handling due to sorption and particle-bound release.
- Not applicable to low dry-matter samples (<33%).
- Careful consideration required for hydrophobic organic compounds (HOCs) and potential losses on bottles or filters.
- Annexes: Informative annexes cover factors influencing leaching, example separation procedures (for inorganic testing), and centrifugation calculation guidance.
Practical applications and users
- Environmental laboratories performing soil quality assessments, regulatory compliance and routine control testing.
- Ecotoxicologists and risk assessors who require eluates for ISO 15799 / ISO 17616 ecotoxicological or genotoxicological assays.
- Waste management, land remediation and environmental consulting firms assessing contaminant mobility and potential release from soils and soil-like materials.
- Researchers conducting comparative studies of leaching behavior under defined L/S conditions.
Related standards (useful cross-references)
- ISO 11465 - Determination of dry matter and water content (gravimetric)
- ISO 15799, ISO 17616 - Ecotoxicological testing of eluates
- ISO 3696, ISO 5667-3, ISO 7027-1, ISO 10523 - Water quality and sampling/analytical support
- EN 12457-1 / DIN 19529 - historical/validation basis
ISO 21268-1:2019 is a compliance-category leaching test designed to produce reproducible eluates for chemical and ecotoxicological evaluation. It should be used together with complementary leaching tests when a full characterization of soil leaching behavior is required.
Технические детали
- Технический комитет
- ISO/TC 190/SC 7 - Impact assessment
- SKU
- ISO 21268-1:2019
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