GB/T 21855-2008 English PDFUS$369.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 21855-2008: Chemicals -- Test of hydrolysis as a function of pH Status: Valid
Basic dataStandard 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 ForewordThis 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.IntroductionChemicals 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 ScopeThis 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 definitionsThe 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). ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 21855-2008_English be delivered?Answer: Upon your order, we will start to translate GB/T 21855-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 21855-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 21855-2008_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. |
