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ASTM D1253-2008 水中残余氯的标准试验方法

ASTM D1253-2008 水中残余氯的标准试验方法

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【英文标准名称】: Standard Test Method for Residual Chlorine in Water
【原文标准名称】: 水中残余氯的标准试验方法
【标准号】: ASTM D1253-2008
【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】: D19.05
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: amperometric; analysis; chlorine; water; Chlorine content--water; Inorganic chemical analysis--water; Inorganic compounds--water; Residual chlorine
【摘要】: Chlorine is used to destroy or deactivate a variety of unwanted chemicals and microorganisms in water and wastewater. An uncontrolled excess of chlorine in water, whether free available or combined, can adversely affect the subsequent use of the water.1.1 This test method covers the determination of residual chlorine in water by direct amperometric titration. 1.2 Within the constraints specified in Section 6, this test method is not subject to commonly encountered interferences and is applicable to most waters. Some waters, however, can exert an iodine demand, usually because of organic material, making less iodine available for measurement by this test method. Thus, it is possible to obtain falsely low chlorine readings, even though the test method is working properly, without the user''s knowledge. 1.3 Precision data for this test method were obtained on estuary, inland main stem river, fresh lake, open ocean, and fresh cooling tower blowdown water. Bias data could not be determined because of the instability of solutions of chlorine in water. It is the user''s responsibility to ensure the validity of the test method for untested types of water. 1.4 In the testing by which this standard was validated, the direct and back starch-iodide titrations and the amperometric back titration, formerly part of this standard, were found to be unworkable and were discontinued in 1986. Historical information is presented in Appendix X1. Note 18212;Orthotolidine test methods have been omitted because of poor precision and accuracy. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.
【中国标准分类号】: Z16
【国际标准分类号】: 13_060_50
【页数】: 5P.;A4
【正文语种】: 英语

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