1.1 本规程描述了使用复合废液取样器或“COLIWASA”对液体进行取样的程序COLIWASA是从分层或非分层液体中获取代表性样品的合适设备。其最常见的用途是对集装箱液体进行采样，如储罐、桶和圆桶。它也可用于水池和其他静止液体的开放体。 注1: COLIWASA的一个限制是，止动机构可能不允许收集大约底部2.54的水 厘米（1 英寸。）取决于塞子的结构。 1.2 COLIWASA不应用于对流动或移动的液体进行采样。 1.3 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 . 以国际单位制以外的单位报告试验结果不应视为不符合本标准。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本规程适用于液体废物和其他分层液体的取样。COLIWASA用于获得代表取样材料准确横截面的垂直液体柱。为了获得分层液体的代表性样本，COLIWASA应在两端打开，以便在缓慢降低至所需采样深度时，材料流过。 挡块就位时，不得降低COLIWASA。在管道浸没后打开塞子将导致材料仅从底层流入，从而导致该层的过度表达。 5.2 本规程适用于采集样本的人员。 5.3 本规程应与指南一起使用 D4687 包括采样计划、安全、QA、保存、去污、标签和监管链程序；实践 D5088 其中包括废物处理场使用的现场设备的去污；实践 D5283 包括环境现场作业的项目规范和实践； 和实践 D5743 其中包括滚筒取样。

1.1 This practice describes the procedure for sampling liquids with the composite liquid waste sampler, or “COLIWASA.” The COLIWASA is an appropriate device for obtaining a representative sample from stratified or unstratified liquids. Its most common use is for sampling containerized liquids, such as tanks, barrels, and drums. It may also be used for pools and other open bodies of stagnant liquid. Note 1: A limitation of the COLIWASA is that the stopper mechanism may not allow collection of approximately the bottom 2.54 cm (1 in.) of material, depending on construction of the stopper. 1.2 The COLIWASA should not be used to sample flowing or moving liquids. 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard. 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. ====== Significance And Use ====== 5.1 This practice is applicable to sampling liquid wastes and other stratified liquids. The COLIWASA is used to obtain a vertical column of liquid representing an accurate cross section of the sampled material. To obtain a representative sample of stratified liquids, the COLIWASA should be open at both ends so that material flows through it as it is slowly lowered to the desired sampling depth. The COLIWASA must not be lowered with the stopper in place. Opening the stopper after the tube is submerged will cause material to flow in from the bottom layer only, resulting in gross over-representation of that layer. 5.2 This practice is to be used by personnel acquiring samples. 5.3 This practice should be used in conjunction with Guide D4687 which covers sampling plans, safety, QA, preservation, decontamination, labeling, and chain-of-custody procedures; Practice D5088 which covers decontamination of field equipment used at waste sites; Practice D5283 which covers project specifications and practices for environmental field operations; and Practice D5743 which covers drum sampling.