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| GB/T 8308-2013 | English | 239 |
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Tea -- Determination of acid-insoluble ash content
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| GB/T 8308-2002 | English | 239 |
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Tea -- Determination of acid -- Insoluble ash content
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| GB/T 8308-1987 | English | 199 |
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Basic data
| Standard ID | GB/T 8308-2013 (GB/T8308-2013) |
| Description (Translated English) | Tea -- Determination of acid-insoluble ash content |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | X04 |
| Classification of International Standard | 67.140.10 |
| Word Count Estimation | 6,651 |
| Older Standard (superseded by this standard) | GB/T 8308-2002 |
| Quoted Standard | GB/T 8302; GB/T 8303; GB/T 8306 |
| Adopted Standard | ISO 1577-1987, MOD |
| Regulation (derived from) | National Standards Bulletin 2013 No. 27 |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This standard specifies the tea acid insoluble ash determination reagents and solutions, apparatus and appliances, and the result of the calculation method for the determination of step. This standard applies to the determination of acid-insoluble ash tea |
GB/T 8308-2013: Tea -- Determination of acid-insoluble ash content
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Tea. Determination of acid-insoluble ash content
ICS 67.140.10
X04
National Standards of People's Republic of China
Replacing GB/T 8308-2002
Tea acid insoluble ash content
(ISO 1577. 1987, Tea-Determinationofacid-insolubleash, MOD)
Issued on. 2013-12-31
2014-06-22 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard replaces GB/T 8308-2002 "tea acid insoluble ash content." This standard compared with GB/T 8308-2002, the main
Technical differences are as follows.
--- Modify the repeatability requirement. Each 100g sample shall not exceed 0.02g, revised as measured under the same conditions repeated sample obtained
Given absolute difference may not exceed 10% of the arithmetic mean.
This standard uses redrafted law revision using ISO 1577. 1987 "tea acid insoluble ash content." This standard and ISO 1575.
Compared to 1987, the main technical changes are as follows.
--- Preparation ash does not add vegetable oil;
--- When measured by the turbidity of the solution process becomes transparent, heating was continued for 5min, then washed neutral;
--- Repeatability. the difference between the results of two measurements per 100g sample of acid-insoluble ash shall not exceed 0.02g, modified to repeat
The absolute difference of the same sample obtained under the conditions of the measurement result shall not exceed 10% of the arithmetic mean;
--- Remove the ISO 1575. 1987 Chapter 9 test reports.
This standard also made the following editorial changes.
--- Remove the ISO 1575. 1987 Foreword.
The standard proposed by China Federation of Supply and Marketing Cooperatives.
This standard by the National Standardization Technical Committee of tea (SAC/TC339) centralized.
This standard was drafted. China Federation of Supply and Marketing Cooperatives Hangzhou Tea Research Institute, the National Tea Quality Supervision and Inspection Center.
The main drafters of this standard. Zhou Weilong, Xu Jianfeng, Lu Xiaolei, Wang Jin, Sha Tao.
GB/T 8308 release of the previous version of the case.
--- GB/T 8308-1987, GB/T 8308-2002.
Tea acid insoluble ash content
1 Scope
This standard specifies the tea acid insoluble ash content of reagents and solutions, apparatus and appliances, measurement methods, procedures and results calculation.
This standard applies to the determination of Tea by acid-insoluble ash.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 8302 sampling Tea (GB/T 8302-2013, ISO 1839. 1980, NEQ)
GB/T 8303 Tea grated dry matter content of the sample preparation and measurement (GB/T 8303-2013, ISO 1572. 1980,
MOD)
GB/T 8306 Tea Determination of total ash (GB/T 8306-2013, ISO 1575. 1987, MOD)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Acid insoluble ash acid-insolubleash
Under specified conditions, the remaining part of the total ash with hydrochloric acid after the treatment.
Principle 4
Total ash treated with hydrochloric acid solution, filtered, and burning the residue weighed after ignition.
5 Reagents and solutions
10% hydrochloric acid solution. 24mL AR concentrated hydrochloric acid (density 1.18g/mL, mass fraction of 37.5%) was diluted with distilled water to
100mL.
6 apparatus and appliances
6.1 Crucible. Platinum porcelain or other conditions will not be affected by the determination of the material. High type, capacity 50mL.
6.2 Electric hot plate.
6.3 high-temperature furnace. temperature 525 ℃ ± 25 ℃.
6.4 water bath.
6.5 dryer. containing more effective desiccant.
6.6 Analysis of balance. a sense of the amount of 0.001g.
...
