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GB/T 12496.8-2015 (GBT12496.8-2015)

GB/T 12496.8-2015_English: PDF (GBT 12496.8-2015, GBT12496.8-2015)
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GB/T 12496.8-2015English150 Add to Cart 0--9 seconds. Auto-delivery Test methods of wooden activated carbon -- Determination of iodine number Valid GB/T 12496.8-2015

Standard ID GB/T 12496.8-2015 (GB/T12496.8-2015)
Description (Translated English) Test methods of wooden activated carbon -- Determination of iodine number
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard B73
Classification of International Standard 65.020
Word Count Estimation 8,868
Date of Issue 2015-07-03
Date of Implementation 2015-11-02
Older Standard (superseded by this standard) GB/T 12496.8-1999
Quoted Standard GB/T 6682
Drafting Organization Chinese Academy of Forestry Forest Research Institute of Chemical Industry
Administrative Organization State Forestry Administration
Regulation (derived from) National Standard Announcement 2015 No.22
Proposing organization State Forestry Administration
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This Standard specifies the test method for wood activated carbon iodine adsorption. This Standard applies to the determination of wood activated carbon iodine adsorption.

Standards related to: GB/T 12496.8-2015

GB/T 12496.8-2015
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
Issued by. General Administration of Quality Supervision, Inspection and
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 
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
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
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