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ASTM D3370-2008 从关闭水管中的抽取水样的标准实施规程

ASTM D3370-2008 从关闭水管中的抽取水样的标准实施规程

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资料描述

【英文标准名称】: Standard Practices for Sampling Water from Closed Conduits
【原文标准名称】: 从关闭水管中的抽取水样的标准实施规程
【标准号】: ASTM D3370-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: D19.03
【标准类型】: (Practice)
【标准水平】: ()
【中文主题词】:
【英文主题词】: back pressure regulator; pressure reducer; sample cooler; sampling; sampling equipment; variable rod-in-tube orifice; water; Back pressure regulator; Chelation; Closed conduits; Equipment (for sampling water); Field testing--water; Graphite furnace a
【摘要】: The goal of sampling is to obtain for analysis a portion of the main body of water that is representative. The most critical factors necessary to achieve this are points of sampling, and materials selection, system design, time of sampling, frequency of sampling, and proper procedures to maintain the integrity of the sample prior to analysis. Homogeneity of the process to be sampled is frequently lacking, necessitating multiple-point sampling. If it is impractical to utilize a most-representative sampling point, it may be practical to determine and understand interrelationships so that results obtained at a minimum number of points may be used to characterize the system. Samples collected from a single point in a system are always recognized as being non-representative to some degree. For this reason, total representativeness of samples cannot be a prerequisite to the selection of a sampling point. The degree of representativeness of the sample shall be assessed and the assessment made a part of the permanent record. This will prevent an artificial degree of accuracy from being assigned to the data derived from tests on the sample. The samples shall be of sufficient volume and shall be taken frequently enough to permit reproducibility of testing requisite for the desired objective, as required by the method of analysis to be used. Laboratories or facilities conducting water sampling should be in compliance with Guide D 3856.1.1 These practices cover the equipment and methods for sampling water from closed conduits such as process streams at power stations for chemical, physical, microbiological, and radiological analyses. It does not cover specialized equipment required for and unique to a specific test or method of analysis. The following are included:
Sections
Practice Ax2014;Grab Samples
9 to 17
Practice Bx2014;Composite Samples
18 to 23
Practice Cx2014;Continual Sampling
24 to 29

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