GB/T 21851-2008 English PDFUS$879.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 21851-2008: Chemicals -- Adsorption / desorption using a batch equilibrium method Status: Valid
Basic dataStandard ID: GB/T 21851-2008 (GB/T21851-2008)Description (Translated English): Chemicals -- Adsorption / desorption using a batch equilibrium method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A80 Classification of International Standard: 13.300 Word Count Estimation: 40,484 Date of Issue: 2008-05-12 Date of Implementation: 2008-09-01 Quoted Standard: ISO 10381-6; ISO 10390-1 Adopted Standard: OECD No.106-1998, 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 equilibrium assay batch adsorption/desorption test range, definitions and units test principle, the test substance information suitability test, test method, adsorption/desorption tests necessary for the test procedure, data and reports. This standard applies to using the batch equilibrium method detects chemicals in the soil adsorption/desorption behavior. GB/T 21851-2008: Chemicals -- Adsorption / desorption using a batch equilibrium method---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. Adsorption. Desorption using a batch equilibrium method ICS 13.300 A80 National Standards of People's Republic of China Batch equilibrium chemical assay Adsorption/desorption test 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. 106 (1998) "Batch equilibrium assay suck Attached/desorption test "(in English). This standard made the following editorial changes. --- Increased Normative References section, the file referenced from the standard text mentioned. --- "The Guidelines" be replaced by "of this standard." --- The units of measurement to our legal units of measurement. This standard appendix A ~ Appendix G 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. OECD Introduction This standard is based on the proposal submitted by the European Commission in 1993, and considering the comments submitted by Member States on the proposal. To open Hair assay, the EU carried out several activities, including a the German Federal Environmental Protection Agency [UBA], Kiel University and the Council of Europe and Its Joint Research Centre in Ispra, Italy completed an extensive survey of co-operation [1], [2]. 1988, UBA organized a ring test Inspection, EU member states have 27 laboratories participated in the test [3]. 1995 Italy Belgirate convened an economic cooperation Seminars and Development Soil choose the topic [4]. Thematic agreed the latest "OECD Test Guideline 106," the main content for suction Attached/desorption tests, especially the agreement using the feature selection and soil types in the test. Other guide for adsorption/desorption exist only at the national level, and are mainly considered in pesticide testing [5] to [11]. In the development The criteria to consider these documents and the associated large number of documents. Adsorption/desorption studies to obtain information about the mobility of chemicals and their distribution in the biosphere constitute the soil, water and air, and the like Necessary information helpful [12] to [21]. This information can predict and estimate the availability of chemical degradation [22], [23], the conversion of the organism and suck Closed [24]; soil permeability [16], [18], [19], [21], [25] to [28]; volatile in soil [21], [29], [30] ; as well as soil erosion rate [18], [31], [32] manipulation use. Adsorption data can also be used for modeling and comparing [19], [33] - [35]. Chemical distribution between soil and aqueous phases is a complex process, depends on many different factors. the chemical nature of this substance Quality [12], [36] - [40], properties of the soil [4], [12] to [14], [41] - [49] as well as climatic factors (such as rainfall, temperature, sunlight and wind). Thus, in many Soil adsorption phenomena and mechanisms of certain chemicals involved in the process not to be entirely through a simplified laboratory models (such as the legacy of OECD Guidelines) definition. However, even if this attempt can not cover all possible environmental conditions, but also provides information on a chemical substance Valuable information related to environmental quality adsorption. The standard for estimating soil adsorption of certain substances/desorption behavior established. The aim is to predict a usable in a variety of Adsorption values \u200b\u200bused under environmental conditions; to this end, chemical equilibrium in a variety of soil adsorption coefficient is defined as a function of soil characteristics (for example, For example, the amount of organic carbon, clay content and soil texture and pH). In order to cover the widest possible interactions of a given substance and natural soil must Use different soil types. In this standard, the adsorption process represents a chemical substance adsorbed to the surface of the soil; it does not distinguish between different adsorption processes (physical and chemical Adsorption) and catalytic surface degradation, physical adsorption or chemical reactions and other processes. By the soil colloidal particles (diameter less than 0.2μm) produced suck Attached not be counted. For adsorption has the most important influence of soil parameters are. organic carbon content [3], [4], [12] to [14], [41], [43] - [48]; clay content and soil quality To [3], [4], [41] - [48]; pH and ionic compounds [3], [4], [42]. Likely to affect the substance of a particular soil adsorption/desorption The parameters are. the actual cation exchange capacity [ECEC], the content of amorphous Fe and Al oxides, particularly volcanic and tropical soils [4], as well as some special The surface of the soil [49]. This standard is used to estimate the amount of organic carbon, clay content and soil texture and pH range of different situations, a chemical substance in different Adsorbed on the soil type. It consists of three steps. Step 1. Preliminary study in order to determine. --- Soil/solution ratio; --- Adsorption equilibrium time and the amount of test substance adsorbed at equilibrium; Adsorption of the test substance on the surface of the test vessel --- as well as the stability of the test substance during the test. Step 2. Screening test. a single concentration of adsorption kinetics, adsorption studies in five different soil types, and measuring the distribution system Number Kd and Koc. Step 3. Determination of Freundlich adsorption isotherm, determine the effect of concentration on soil adsorption. Desorption study (Appendix A) by desorption kinetics/Freundlich desorption isotherm. Batch equilibrium chemical assay Adsorption/desorption test1 ScopeThis standard specifies the/desorption test to detect a range of chemicals batch adsorption equilibrium method, definitions and units, the test principle, test substances information Test the applicability of the test method, the necessary conditions for the adsorption/desorption tests, test procedures and data reporting. This standard applies to the use of chemical assay batch equilibrium adsorption/desorption behavior in soil.2 Normative referencesThe following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. ISO 10381-6 Soil sampling - Part 1. Sampling Method Design Guide ISO 10390-1 Soil quality - Determination of pH value3 DEFINITIONS AND UNITSDefinitions and units defined in Chapter 10 and Appendix B, respectively. The soil sample quality standards referred to in the equation refers to the quality of drying.4 Test principleAlready know the dry weight, and with 0.01mol/L calcium chloride solution to balance the soil sample, a known volume of unlabelled or labeled Remember the test substance, and is known for its concentration 0.01mol/L calcium chloride solution. The mixture was stirred for a certain time. Then divide by centrifugation Suspension from the soil, if desired, the aqueous phase was filtered and analyzed. The amount of test substance adsorbed on the soil sample, is equal to the initial test substance in solution Difference (indirect method) the amount and the amount remaining at the end of the experiment between. Another option, the amount of adsorption of the test substance to be measured directly (direct method) by soil analysis. Although this makes the analysis process becomes More complicated, involves stepwise soil extraction with appropriate solvent, is recommended in the concentration of the test substance can not be accurately measured was the difference between love Under conditions before using this method. Such as the following. the test substance adsorbed on the surface of the test vessel, the test substance is unstable in the experiment, in a solvent Produced little change in the concentration of weak adsorption solution; and generating strong adsorption can not be accurately determined in a low concentration. If you are using radiolabeled Hutchison was possible because of combustion and liquid scintillation counting phase analysis of the soil without further soil extraction. However, a liquid scintillation counting Species uncertain technology, unable to test chemical and its transformation products to distinguish; therefore only the test substance is stable during the study period Time, this method should be used.5 test substance informationUse analytical grade chemicals. We recommend using unlabeled test substance (known in its composition, purity of at least 95%), or has been put to use Radioactive labeled test substance (known to component and radiological purity). If the half-life tracers, decay should be amended. Before the adsorption/desorption tests, should have the following information about the test substance. a) Solubility in water [OECD105]; b) vapor pressure [OECD104] and (or) Henry's constant; Hydrolysis c) associated with the pH [OECD111]; d) n-octanol/water partition coefficient [OECD107 and 117]; ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 21851-2008_English be delivered?Answer: Upon your order, we will start to translate GB/T 21851-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 21851-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 21851-2008_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. 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