GB/T 12496.8-2015 PDF EnglishUS$150.00 · In stock · Download in 9 seconds
GB/T 12496.8-2015: Test methods of wooden activated carbon - Determination of iodine number Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 12496.8: Historical versions
Similar standardsGB/T 12496.8-2015: Test methods of wooden activated carbon - Determination of iodine number---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12496.8-2015GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.020 B 73 Replacing GB/T 12496.8-1999 Test methods of wooden activated carbon - Determination of iodine number Issued on: JULY 03, 2015 Implemented on: NOVEMBER 02, 2015 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Method summary ... 4 4 Instruments and reagents ... 4 5 Solution ... 5 6 Operating steps ... 7 7 Calculation of results ... 8 8 Precision and deviation ... 10ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 12496.8-1999 “Test methods of wooden activated carbon-Determination of iodine number”. The main technical changes of this standard compared with GB/T 12496.8- 1999 are as follows. - ADJUST the ratio of potassium iodide to iodine from 2.0.1 in the original standard to 1.5.1. - For the calibration of sodium thiosulfate solution, CHANGE the potassium dichromate method in the original standard to the potassium iodate method. - CHANGE the concentration of hydrochloric acid from “1 + 9” of the original standard to 5 wt%. This standard was proposed and shall be under the jurisdiction of the State Forestry Administration. Drafting organization of this standard. Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry. The main drafters of this standard. Deng Xianlun, Dai Weidi, Sun Kang, Zhu Guangzhen, Zhang Yanping. This standard replaces the standard previously issued as follows. - GB/T 12496.7-1990; - GB/T 12496.8-1999. Test methods of wooden activated carbon - Determination of iodine number1 ScopeThis standard specifies the test method for the iodine number of wooden activated carbon. This standard applies to the determination of iodine number of wooden activated carbon.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 6682 Water for analytical laboratory use - Specification and test methods3 Method summaryAfter a certain amount of the sample and the iodine solution are oscillated and adsorbed, it is filtered, the filtrate is taken, the amount of iodine remaining in the filtrate is titrated with a sodium thiosulfate solution. The amount of iodine (in milligrams) per gram of carbon adsorbed at a residual iodine concentration of 0.02 mol/L (1/2 I2) is determined as the iodine value.4 Instruments and reagentsThe water used in this standard shall comply with the grade 3 water specifications in GB/T 6682; all the reagents listed are analytical pure unless otherwise specified. 4.1 Balance, precision 0.0001 g. 4.2 Electric constant temperature drying oven. 4.3 Oscillator, frequency 240 times/min ~ 275 times/min. 4.4 Sealed sample crusher. 4.5 Stopwatch timer. 4.6 Dryer. 4.7 Conical flask with a stopper, 250 mL. 4.8 Acid burette, 10 mL, precision 0.05 mL; basic burette, 50 mL, precision 0.1 mL. 4.9 Wide-mouth conical flask, 250 mL. 4.10 Measuring cylinder, 100 mL and 1000 mL. 4.11 Volumetric flask, colorless and brown. 4.12 Beaker. 4.13 Funnel, with an inner diameter of upper opening at 100 mm. 4.14 Reagent bottle, colorless and brown. 4.15 Qualitative filter paper, GB/T 1914, medium speed (102), φ12.5 cm. 4.16 Pipette, 10 mL and 50 mL. 4.17 Concentrated hydrochloric acid (GB/T 622). 4.18 Iodine (GB/T 675). 4.19 Potassium iodide (GB/T 1272). 4.20 Sodium thiosulfate [Na2S2O3 • 5H2O] (GB/T 637). 4.21 Soluble starch (HG/T 2759). 4.22 Potassium iodate (GB 1258). 4.23 Anhydrous sodium carbonate (GB/T 639). 4.24 Color changing silica gel (HG/T 2765.4).5 Solution5.1 Iodine (1/2 I2) standard solution (0.1000 mol/L) WEIGH 19.100 g of potassium iodide, completely DISSOLVE it in a beaker containing about 30 mL of water, ADD 12.700 g of iodine whilst stirring it, so ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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