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GB/T 12496.8-2015 PDF in English


GB/T 12496.8-2015 (GB/T12496.8-2015, GBT 12496.8-2015, GBT12496.8-2015)
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GB/T 12496.8-2015: PDF in English (GBT 12496.8-2015)

GB/T 12496.8-2015
GB
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 Contents
Foreword ... 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 ... 10 
Foreword
This 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 number
1 Scope
This 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 references
The 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
methods
3 Method summary
After 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 reagents
The 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 Solution
5.1 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 PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.