GB/T 21845-2008 English PDFUS$194.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 21845-2008: Chemicals -- Water solubility test Status: Valid
Basic dataStandard ID: GB/T 21845-2008 (GB/T21845-2008)Description (Translated English): Chemicals -- Water solubility test Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A80 Classification of International Standard: 13.300 Word Count Estimation: 10,116 Date of Issue: 2008-05-12 Date of Implementation: 2008-09-01 Adopted Standard: OECD No.105-1995, 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 water solubility test scope, definitions and units, reference, test methods, data and reports. This standard applies to the determination of the water solubility of chemicals. GB/T 21845-2008: Chemicals -- Water solubility test---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. Water solubility test ICS 13.300 A80 National Standards of People's Republic of China Chemical water solubility 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 identical with the Organisation for Economic Co-operation and Development (OECD) Guidelines for the Testing of Chemicals 105 (1995), "Water solubility" (in English). This standard made the following editorial changes. --- Increasing the scope section; --- The units of measurement to our legal units of measurement. 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. The main drafters of this standard. a new week, Falls Apart, Wang Junbing at Wen Lin, Wang Lifeng, Hao Nan, Sun Xin, Wang Zheng. This standard is the first release. OECD Introduction This standard is a revised version of the 1981 original OECD105 methods. The new 1981 edition on chemical substances not the difference. The main format is changed. This version is also based on EC method "Water solubility" [1] was modified. The water solubility of the material is greatly affected by impurities. This method is a method for measuring the water solubility of the pure substance, the substance shall be in the water Stable and less volatile. Prior to the determination of water solubility, some preliminary information obtained compounds are useful, for example, structural formula, the vapor Pressure, the dissociation constant and the hydrolysis under pH conditions. This standard describes two methods. Column elution method and the flask method, in this standard, applicable to their respective solubility of less than and greater than 10-2g/L of chemicals. This standard also describes a simple preliminary test. In the final step when the pre-test tests using sample sizes of The number is rough, but also make the solution reached saturation takes time. Chemical water solubility test1 ScopeThis standard specifies the scope of the water solubility test chemicals, definitions and units, reference, test methods, data and reports. This standard applies to the determination of the water solubility of chemicals.2 Terms and definitionsThe following terms and definitions apply to this standard. 2.1 The water solubility of a substance at a given temperature, the saturation concentration in water. Solubility in water per unit volume of the solute in the solution The quality of said standard units of kg/m3, but the unit is usually g/L.3 referenceThis standard does not require reference. Test Method 4 4.1 Test conditions The test shall be at 20 ℃ ± 0.5 ℃ shall be carried out so that the relevant portion of all devices are in constant fix a lower temperature. 4.2 Pre-test At room temperature, the sample was added to about 0.1g in 10mL grinding mouth with a glass stopper graduated cylinder (solids must be pulverized End), increasing the volume of water, in a quantity of water after each addition, the mixture was stirred 10min, was visually checked whether there is an insoluble sample. If you add water, 10mL, the sample or when certain parts are still solvent, the test should be continued in 100mL graduated cylinder. In Table 1 is Approximate Solubility (g/L) sample occurs when the whole solution. When the solubility of small, it takes a long time to dissolve the sample, allow at least 24h. If 24h After the substance has not dissolved, it allows for longer (up to 96h) or try to continue to explain and determine whether to adopt the column elution method or flask method. Table 1 Preliminary test substance to approximate solubility table In the "x0" ml of water was dissolved 0.1g sample 0.1 0.5 1210100 > 100 Approximate solubility/(g/L)> 1000 1000 ~ 200 200 ~ 100 100 ~ 50 50 ~ 10 10 ~ 1 < 1 4.3 column elution method 4.3.1 Principle In a mini-column packed with an excess of test substance previously covered with a carrier, the reference column is washed with water from a micro-column test was mentioned, With the change of time [2], when the mass concentration of the eluent outflow reaches a stable value, that is, the water solubility. 4.3.2 means Means for holding constant micro column (Fig. 1), both coupled to a reflux pump (Fig. 2), and a regulator coupled to the horizontal plane Container (Fig. 3). Micro column containing an inert carrier and fixed in a glass wool plug for filtering particulates. Used as a carrier substance Glass spheres may be, may be diatomaceous earth or other inert material. Micro Column 1, mounted on the backwash pump, which has a stigma volume space provides five samples of the bed (not at start of test By volume) and five samples (test sample used in the analysis). If water is added to the test system will replace the initial five bed samples, To remove impurities, then you can reduce the size of the micro column. Micro column and the pipe made of inert material is connected to the return pump, flow rates can be achieved ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 21845-2008_English be delivered?Answer: Upon your order, we will start to translate GB/T 21845-2008_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 21845-2008_English with my colleagues?Answer: Yes. 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