GB/T 12496.9-2015 PDF English
US$100.00 · In stock · Download in 9 secondsGB/T 12496.9-2015: Test methods of wooden activated carbon -- Determination of decolorization of caramel Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 12496.9: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12496.9-2015 | English | 100 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test methods of wooden activated carbon -- Determination of decolorization of caramel
| Valid |
| GB/T 12496.9-1999 | English | 199 |
Add to Cart
|
2 days
|
Test methods of wooden activated carbon-Determination of decolorization of caramel
| Obsolete |
| GB/T 12496.9-1990 | English | 199 |
Add to Cart
|
2 days
|
Test method of wooden activated carbon--Chloride content
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 12496.9-2015
GB/T 12496.9-2015: Test methods of wooden activated carbon -- Determination of decolorization of caramel
---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/GBT12496.9-2015
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... 8
Foreword
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 Caramel
1 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
Methods
3 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.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 12496.9-2015 be delivered?Answer: The full copy PDF of English version of GB/T 12496.9-2015 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 12496.9-2015_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 12496.9-2015_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 12496.9-2015 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 12496.9-2015?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12496.9-2015 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 12496.9-2015?A step-by-step guide to download PDF of GB/T 12496.9-2015_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 12496.9-2015".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|