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GB/T 21855-2008: Chemicals -- Test of hydrolysis as a function of pH
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 21855-2008 | English | 369 |
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Chemicals -- Test of hydrolysis as a function of pH
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GB/T 21855-2008
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Basic data | Standard ID | GB/T 21855-2008 (GB/T21855-2008) | | Description (Translated English) | Chemicals -- Test of hydrolysis as a function of pH | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A80 | | Classification of International Standard | 13.300 | | Word Count Estimation | 16,152 | | Date of Issue | 2008-05-12 | | Date of Implementation | 2008-09-01 | | Adopted Standard | OECD No.111-2004, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards 2008 No. 8 (No. 121 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the chemical hydrolysis of pH test range, definitions of terms, test principle, the test substance information, reference material, quality control, testing methods, data and reporting, interpretation of results and evaluation. This standard applies to the determination of pH on chemical hydrolysis capabilities. This standard applies to those with sufficient accuracy and sensitivity of the analytical method compounds. For minor volatile and non -volatile compound having a sufficiently high water solubility. Not applicable to highly volatile, under the experimental conditions to be stored in an aqueous solution of the compound. On very small water-soluble substances are difficult to test. | GB/T 21855-2008: Chemicals -- Test of hydrolysis as a function of pH---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemicals.Test of hydrolysis as a function of pH
ICS 13.300
A80
National Standards of People's Republic of China
Posted 2008-05-12
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is equivalent (OECD) Chemicals Test Guidelines adopted Organisation for Economic Co-operation and Development is No. 111 (2004) "and related water pH
Solutions for action "(in English).
This standard made the following editorial changes.
--- Increasing the scope section;
--- The units of measurement to our legal units of measurement;
--- The appendix of terms and definitions content into text terms and definitions section;
--- Will test the effectiveness of content into Chapter 1. Range section.
The Standard Appendix A, Appendix B is an informative annex.
This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points.
This standard is drafted by. China Inspection and Quarantine Science Research Institute.
Participated in the drafting of this standard. Institute of Ecological Environment Research Center.
The main drafters of this standard. a new week, Falls Apart, Wang Junbing at Wen Lin, Qin Zhanfen, Zheng Minghui, Hao Nan, Wang Lifeng, Sun Xin, Wang Zheng.
This standard is the first release.
Introduction
Chemicals enter surface waters through the following channels. direct application, spray drift, drain, discharge, waste disposal, industrial, domestic or agricultural pollution
Water, and atmospheric deposition and may be transformed in the water chemicals (such as hydrolysis, oxidation), photochemical and may or microbial transformation.
This standard describes a laboratory test method to assess belongs to a normal environment (pH value 4-9) Chemicals pH of aquatic systems
Hydrolysis conversion of the existing standard based on the following guidelines. References [1], [2], [3], [4], [5], [6], [7].
The test for the determination of. the rate of hydrolysis and pH related to (1) test substance; component (2) hydrolyzate, nature and generating dissociation
Rate. In this study, the direct effects on surface water or seep through these channels is likely to chemicals in the environment assessment must enter
Row.
1 Scope
This standard specifies the scope of the information related to the chemical and pH hydrolysis tests, definitions of terms, the principle of the test, the test substance, reference
Interpretation and evaluation of substance, quality control, test methods, data and reporting the results.
This standard applies to the determination of the hydrolysis of the ability of chemicals and pH-related. This standard applies to those with sufficient accuracy and flexibility have
Compound analytical method sensitivity (not markers and markers). It applies for minor volatile and nonvolatile has sufficient water solubility
Compound. It does not apply to high volatility (e.g. fumigants, organic solvent), in aqueous solution under experimental conditions in the preserved compound.
Test substance for minimal water-soluble difficult [8].
2 Terms and definitions
The following terms and definitions apply to this standard.
2.1
The use of international standard unit under any circumstances.
2.2
Any substance, including a product of the parent compound and the corresponding transformed.
2.3
Biotic and abiotic conversion of all substances produced by the reaction of the test substance occur.
2.4
It was converted by the hydrolysis test all substances produced by the reaction.
2.5
Refers to a certain reaction center RX test substance with water, the net exchange reaction with the OH moiety which moiety X generated, see reaction formula (1).
RX + → HOH ROH + HX (1)
In this simplified process to reduce the concentration of RX, the reaction rate is as follows.
rate = K [H2O] [RX] second-order reaction
rate = K [RX] first order reaction
Depending on the rate determining step. As compared with the test substance, the water showed a large surplus, so this kind of reaction is usually described as a pseudo
Order reaction, wherein the observed rate constants see formula (2).
Kobs = K [H2O] (2)
And (3) is defined by the formula.
C0
Ct
(3)
The constant in units of reciprocal time, the half-life of the reaction (RX participating in the reaction time to 50%) see equation (4).
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