GB/T 8307-2013 English PDF

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GB/T 8307-2013: Tea -- Determination of water-soluble ash and water-insoluble ash content
Status: Obsolete

GB/T 8307: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 8307-2013	239	Add to Cart	3 days	Tea -- Determination of water-soluble ash and water-insoluble ash content	Obsolete
GB/T 8307-2002	319	Add to Cart	3 days	Tea -- Determination of water -- Soluble ash and water -- Insoluble ash content	Obsolete
GB/T 8307-1987	199	Add to Cart	2 days	Tea--Determination of water-soluble ash and water-insoluble ash content	Obsolete

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GB 7718   GB/T 5532   GB 7718   GB/T 8303   GB/T 8305   GB/T 8302   

Basic data

Standard ID: GB/T 8307-2013 (GB/T8307-2013)
Description (Translated English): Tea -- Determination of water-soluble ash and water-insoluble ash content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X04
Classification of International Standard: 67.140.10
Word Count Estimation: 6,650
Older Standard (superseded by this standard): GB/T 8307-2002
Quoted Standard: GB/T 8302; GB/T 8303; GB/T 8306
Adopted Standard: ISO 1576-1988, 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-soluble and water-insoluble ash ash measuring instruments and appliances, measurement methods and results of the calculation steps. This standard applies to the determination of tea soluble ash and water-insoluble ash.

GB/T 8307-2013: Tea -- Determination of water-soluble ash and water-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 water-soluble ash and water-insoluble ash content ICS 67.140.10 X04 National Standards of People's Republic of China Replacing GB/T 8307-2002 Tea-soluble ash and water - insoluble ash content (ISO 1576. 1988, Tea-Determinationofwater-solubleashand water-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 8307-2002 "tea-soluble ash and water - insoluble ash content." This standard and GB/T 8307- Compared to 2002, the main technical changes are as follows. --- Increased the determination of water insoluble ash retention for acid insoluble ash; --- Repeatability. the difference between the results of two determinations, soluble ash per 100g sample should not exceed 0.2g, modified to duplicate conditions The absolute difference between the measurement results of the same sample must not exceed 5% of the arithmetic mean. This standard uses redrafted law revision using ISO 1576. 1988 "tea-soluble ash and water-insoluble ash determination." The standard Aligned with the ISO 1576. 1988 as compared to the main technical differences are as follows. --- 5g sample quality measurement modify 2g, ashing process does not add vegetable oil; --- Assay filtrate and washings from 60mL volume into 150mL; --- Repeatability. the difference between the results of two determinations, soluble ash per 100g sample should not exceed 0.2g, modified to duplicate conditions The absolute difference between the measurement results of the same sample must not exceed 5% of the arithmetic mean; --- Remove the ISO 1576. 1988, Chapter 8 test reports. This standard also made the following editorial changes. --- Remove the ISO 1576. 1988 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. The previous versions of GB/T 8307 release of case. --- GB/T 8307-1987, GB/T 8307-2002. Tea-soluble ash and water - insoluble ash content

1 Scope

This standard specifies the tea soluble ash and water-insoluble ash measurement apparatus and appliances, measurement methods, procedures and results calculation. This standard applies to the determination of tea soluble ash and water-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 Soluble ash water-solubleash Under specified conditions, some of the water of the total ash dissolved. 3.2 Water-insoluble ash water-insolubleash Under specified conditions, the total ash content of the water-insoluble part. Principle 4 Total ash was extracted with hot water, the ash-free filter paper, burning, weighing the residue measured water insoluble ash; from the total ash and water-insoluble Poor quality of the ash calculation soluble ash.

5 instruments and appliances

5.1 Crucible. Platinum porcelain or other conditions will not be affected by the determination of the material. High type, capacity 30mL. 5.2 Electric hot plate. 5.3 high-temperature furnace. temperature 525 ℃ ± 25 ℃. 5.4 crucible tongs. 5.5 boiling water bath. 5.6 dryer. containing more effective desiccant. 5.7 Analysis of balance. a sense of the amount of 0.001g. ......

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