GB/T 12496.9-2015 English PDF
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GB/T 12496.9: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 12496.9-2015 | 100 | Add to Cart | Auto, 9 seconds. | Test methods of wooden activated carbon -- Determination of decolorization of caramel | Valid |
| GB/T 12496.9-1999 | 199 | Add to Cart | 2 days | Test methods of wooden activated carbon-Determination of decolorization of caramel | Obsolete |
| GB/T 12496.9-1990 | 199 | Add to Cart | 2 days | Test method of wooden activated carbon--Chloride content | Obsolete |
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GB/T 12496.9-2015: Test methods of wooden activated carbon -- Determination of decolorization of caramel
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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.020 B 73 Replacing GB/T 12496.9-1999 Test Methods of Wooden Activated Carbon - Determination of Decolorization of Caramel 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 Main Instruments... 4 5 Main Reagents... 5 6 Preparation and Identification of caramel Liquid... 5 7 Operation Procedures... 7 8 Expression of Caramel Decolorization Results... 8Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009. This Standard replaced GB/T 12496.9-1999 Test Methods of Wooden Activated Carbon - Determination of Decolorization of Caramel. Compared with GB/T 12496.9- 1999, this Standard has the major technical content changes as follows. give more accurate provisions on the operation procedures of the caramel preparation. This Standard was proposed by and under the jurisdiction of State Forestry Administration. Drafting organizations of this Standard. Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; and Nanjing Technology Development Corporation, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry. Chief drafting staffs of this Standard. Gong Jianping, Dai Weidi, Zhang Yanping, Xu Yu, Chen Chao, Jia Yujie, and Zhu Guangzhen. The historical editions replaced by this Standard are as follows. --- GB/T 12496.1-1990; --- GB/T 12496.9-1999. Test Methods of Wooden Activated Carbon - Determination of Decolorization of Caramel1 Scope
This Standard specifies the test method for the decolorization ratio of caramel pigments by wood activated carbon. This Standard is applicable to the determination of the decolorization ratio of caramel by various types of activated carbon for decolorization.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 document. GB/T 6682-2008 Water for Analytical Laboratory Use - Specification and Test Methods3 Method Summary
The sample and caramel are mixed and absorbed, then filtered; and use a spectrophotometer to measure the absorbance of the filtrate.4 Main Instruments
4.1 1000mL three-neck flask. 4.2 Electric mixer (variable speed). 4.3 Glass thermometer (scale 0°C ~ 200°C). 4.4 Temperature controlled electric furnace (or electric heating jacket 1000mL).5 Main Reagents
The water used in this standard shall comply with the specification of Grade-III water specified in GB/T 6682-2008.Unless otherwise specified, the listed reagents refer to analytically pure reagents. 5.1 Anhydrous glucose [C6H12O6] (HG 3-1094). 5.4 Potassium dichromate (GB 1259), benchmark reagent.6 Preparation and Identification of caramel Liquid
6.1 Method-A Caramel 6.1.1 Preparation of Method-A caramel stock solution Take 250g of anhydrous glucose; place it in a 1000mL three-neck flask; add 250mL of water; install an electric mixer and thermometer; and open the other neck. Place the flask in a glycerin bath (the glycerin may be heated in advance), so that the level of the sugar liquid in the flask is consistent with the level of the glycerin bath. 6.1.2 Identification of Method-A caramel stock solution Take 0.833g of caramel stock solution; add water to dissolve and make constant volume to 500mL. 6.2 Method-B caramel 6.2.1 Preparation of Method-B caramel stock solution Take 250g of anhydrous glucose; place it in a 1000mL three-neck flask; add 250mL of water; install an electric mixer and thermometer; and open the other neck. Place the flask in a glycerin bath (the glycerin may be heated in advance), so that the level of the sugar liquid in the flask is consistent with the level of the glycerin bath. 6.2.2 Identification of Method-B caramel stock solution Take 1.00g (accurate to 0.01g) of caramel stock solution; add water to dissolve and make constant volume to 500mL. Then use the spectrophotometer to measure the absorbance in a cuvette with a wavelength of 426nm and a light path length of 1cm; and the absorbance difference with the potassium dichromate color standard solution I under the same conditions shall be no greater than ±0.03.If the absorbance exceeds the above provisions, add a little water to the original solution or evaporate a little water to achieve the specified absorbance. 6.3 Potassium dichromate color standard solution 6.4 Preparation of caramel test solution Take 17.00g (accurate to 0.01g) of the certified caramel stock solution of Method A or Method B; dissolve it with water and transfer to a 500mL volumetric flask to make constant volume. After preparation, use it on the same day; or store it in the refrigerator at -1°C ~ 5°C; the period of use is 3 months. Test solution preparation may be reduced or increased in proportion.7 Operation Procedures
7.1 Method-A caramel decolorization Take 0.400g (accurate to 1mg) of the dried sample crushed to a particle size ≤71μm (through a 200-mesh sieve); place it in a 100mL conical flask with a stopper; add 25mL of caramel test solution by a pipette; and shake it slightly to wet the sample. 7.2 Method-B caramel decolorization Take 0.350 g (accurate to 1 mg) of dried sample crushed to a particle size ≤71μm (through a 200-mesh sieve); and follow the Method-A caramel decolorization procedure of specified in 7.1.8 Expression of Caramel Decolorization Results
8.1 Potassium dichromate taste standard solution (60 mg/L) Take 60mg of potassium dichromate which has been dried according to the method of 6.3; dissolve it in water; make the constant volume to 1000mL; and use a spectrophotometer to measure its absorbance at the wavelength of 426nm. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
