Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM E542-01(2021)
• Năm ban hành / Publication date: 2021
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Standard Practice for Calibration of Laboratory Volumetric Apparatus
• Chỉ số phân loại Quốc tế (ICS) / By field: 17.060 - Ðo thể tích, khối lượng, tỷ khối, độ nhớt
• Số trang / Page: 8
• Phạm vi áp dụng / Scope of standard: 1.1''This practice covers procedures for use in the calibration of volumetric ware, in accordance with Specification E694 such as is in common use in chemical and clinical laboratories. It is based on the gravimetric determination of the quantity of water either contained or delivered, and the conversion of this value to true volume at the standard temperature of 20'''''C by means of suitable equations and standard tables. Calibration using mercury is excluded. Calibration may be performed using alternative gravimetric methodology, provided that it is demonstrated and documented that the results obtained are equivalent to those obtained using the methodology described herein. 1.2''This practice is intended to encompass capacity ware between the limits of 0.1 cm³ and 2000 cm³. Typical products falling within the purview of this practice are burets graduated '''to deliver''', graduated cylinders, volumetric flasks, specific gravity flasks, measuring and dilution pipets, and transfer and capacity pipets. 1.3''The procedures are not recommended for calibration of apparatus with capacities below 0.1 cm³, such as microglassware. 1.4''This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.