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GB/T 8305-2013: Tea -- Determination of water extracts content
Status: Valid GB/T 8305: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 8305-2013 | English | 149 |
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Tea -- Determination of water extracts content
| Valid |
GB/T 8305-2013
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| GB/T 8305-2002 | English | 239 |
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Tea -- Determination of water extracts content
| Obsolete |
GB/T 8305-2002
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| GB/T 8305-1987 | English | 199 |
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Tea--Determination of water extracts content
| Obsolete |
GB/T 8305-1987
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PDF similar to GB/T 8305-2013
Basic data | Standard ID | GB/T 8305-2013 (GB/T8305-2013) | | Description (Translated English) | Tea -- Determination of water extracts content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | X04 | | Classification of International Standard | 67.140.10 | | Word Count Estimation | 5,530 | | Older Standard (superseded by this standard) | GB/T 8305-2002 | | Quoted Standard | GB/T 8302; GB/T 8303 | | Adopted Standard | ISO 9768-1994, MOD | | Regulation (derived from) |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 water extract measurement instruments and appliances, methods of operation and the results of the calculation method. This standard applies to the determination of tea flooding matter. | GB/T 8305-2013: Tea -- Determination of water extracts 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 water extracts content
ICS 67.140.10
X04
National Standards of People's Republic of China
Replacing GB/T 8305-2002
Determination of tea extract
(ISO 9768.1994, Tea-Determinationofwaterextract, 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 8305-2002 "Determination of tea extract." This standard compared with GB/T 8305-2002, Technical
Changes are as follows.
--- Modify the repeatability requirement. not exceeding 0.5g per 100g sample modified to repeat the same sample obtained under the conditions of measurement
The absolute difference between the results should not exceed 2% of the arithmetic mean.
This standard uses redrafted law revision using ISO 9768.1994 "Determination of tea extract." This standard and ISO 9768.1994
Compared to the main technical differences are as follows.
--- With boiling water bath heating instead of direct heating furnace extraction, extraction in order to improve the uniformity, stability;
--- Baking dish and filter paper drying temperature 103 ℃ modified to 120 ℃ ± 2 ℃;
--- Repeatability. absolute error between two-sample test results is less than 1%, revised as measured under the same conditions repeated sample obtained
The absolute difference between the results should not exceed 2% of the arithmetic mean;
--- Removed 10.2 reproducibility;
--- Remove the ISO 9768.1994, Chapter 11 test reports;
--- Remove the ISO 9768.1994 Annex A laboratory comparison results.
This standard also made the following structural modifications.
--- International standard Chapter 6 sampling, sample preparation Chapter 7, 8, respectively, measured steps to modify this standard 6.1,6.2,6.4;
--- International standard 10.1 repetitive modify this standard 7.2.
This standard also made the following editorial changes.
--- Remove the ISO 9768.1994 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 8305 release of the previous version of the case.
--- GB/T 8305-1987, GB/T 8305-2002.
Determination of tea extract
1 Scope
This standard specifies the tea water extracts measurement instruments and equipment, methods of operation and the result of the calculation methods.
This standard applies to tea flooding Spectroscopy.
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)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Water extract waterextracts
Under specified conditions, the leaching of tea with boiling water soluble substances.
Principle 4
Extraction with boiling water reflux tea water-soluble substance, and then filtered, washed, dried, weighed tea leaves after extraction, calculate water extract
content.
5 apparatus and appliances
5.1 blast electric oven. temperature 120 ℃ ± 2 ℃.
5.2 boiling water bath.
5.3 Buchner funnel with the vacuum filtration apparatus.
5.4 Quality aluminum or glass baking dish. a cover, an inner diameter of 75mm ~ 80mm.
5.5 dryer. containing more effective desiccant.
5.6 Analysis of balance. a sense of the amount of 0.001g.
5.7 conical flask. 500mL.
5.8 mill. the material does not absorb moisture made; dead as small as possible, easy to clean; interior aperture of 3mm sieve.
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