GB/T 8304-2002 in English

《GB/T 8304-2002茶 水分测定》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。
本标准规定了对茶叶中水分含量测定的原理、仪器与用具、操作方法及结果计算方法。本标准适用于茶叶中水分的测定。

Scope

National Standard of the People's Republic of China Tea—Determination of moisture content GB/T 8304—2002eqv IS0 1573:1980 replaces GB/T 8304--19871 Scope This standard specifies the principles, instruments and utensils for the determination of moisture content in tea, Methods of operation and calculation of results. This standard applies to the determination of moisture in tea. 2 Referenced Standards The clauses contained in the following standards constitute the clauses of this standard by being quoted 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 8303--2002 Preparation of Ground Tea Sample and Determination of Dry Matter Content 3 Definitions This standard adopts the following definitions. Moisture molsture C0ntent Under normal pressure conditions, the mass loss when the sample is heated to a constant weight at a specified temperature. 4 Principle The sample is heated to constant weight in an electric heating constant temperature drying oven at 103°C ± 2°C, and weighed. 5 Instruments and Utensils Routine laboratory instruments and the following items: 5.1 Aluminum baking dish: with a cover, with an inner diameter of 75 mm to 80 mm. 5.2 Blowing wind electric heating constant temperature drying oven: can automatically control the temperature ± 2 ℃. 5.3 Dryer: It contains an effective desiccant. 5.4 Analytical balance: Sensitivity 0.001 9.6 Operation method 6.1 Sampling According to GB/T 8302 regulations. 6.2 Sample preparation The pressed tea shall be prepared according to the provisions in 6.2.2 of GB/T 8303--2002. Squeeze the tea other than tea, take the sample according to 6.1, and mix the sample evenly. 6.3 Preparation of aluminum baking dish Put the clean baking dish together with the cover in a drying oven at 103°C±2°C, heat it for 1 hour, cover it, take it out, and cool it to room temperature in the desiccator, which is called the National Quality Supervision and Inspection of the People's Republic of China. General Administration of Quarantine 2002-06-17 Approved 2002-12-01 Implementation 1