GB/T 8303-2002 in English

《GB/T 8303-2002茶 磨碎试样的制备及其干物质含量测定》由442（中华全国供销合作总社）归口，主管部门为中华全国供销合作总社。
本标准规定了制备茶叶磨碎试样和测定其干物质含量的方法。本标准适用于干态表示结果的分析测定。

Scope

The National Standard of the People's Republic of China Tea Grind Sample Preparation and Determination of Dry Matter Content GB/T 8303—2002eqv IS0 1572:1980Tea--Preparati. N. F gr. und sample and determinati. N replaces GB/T 8303-1987 of dry matter content1 Scope This standard specifies the method for preparing ground tea samples and determining their dry matter content. This standard applies to analytical determinations that express results in a dry state. 2 Referenced standards The clauses contained in the following standards constitute the clauses of this standard by citing them in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest editions of the standards listed below. GB/T 8302-2002 Tea Sampling GB/T 8304--2002 Tea Moisture Determination 3 Definitions This standard adopts the following definitions. In the material dry matter grind the sample at the specified temperature and heat it to constant weight, the remaining material. 4 Principle Grind the sample, and at the specified temperature, heat it with an electric heating constant temperature drying oven to remove moisture to a constant weight, and weigh it. 5 Instruments and Utensils Laboratory routine instruments and the following items: 5.1 Grinding machine: made of materials that do not absorb moisture; the dead angle is as small as possible and easy to clean; the ground sample can completely pass through the aperture with a diameter of 600 mm to 1 000 mm Hiroshi's sieve. 5.2 Sample container: Brown glass sample bottle or metal sample box can be used. It should be clean, dry, and airtight; it should be made of materials that do not react with the sample; it should be of a size that can fill the ground sample. 5.3 Aluminum baking dish: with a cover, with an inner diameter of 75 mm to 80 mm. 5.4 Blast electric heating constant temperature drying oven: can automatically control the temperature ± 2 C. 5.5 Dryer: Built-in effective desiccant. 5.6 Analytical balance: Sensitivity 0.0019. Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on 2002-06-17 and implemented on 2002-12-011