1.1 本规程涵盖使用基于硫化物或硫氰酸盐的商用现场测试试剂盒定性测定干漆膜中的铅含量。 1.2 本规程也可用作其他干涂膜（如清漆）的定性程序。 1.3 本实践提供了基于硫化物和硫氰酸盐的化学点测试试剂盒的优点和局限性列表，以允许用户在给定环境下选择适当的点测试。 1.4 本规程包含解释性注释，并非强制性要求的一部分。 1.5 本规程中描述的方法可能不符合或不符合具有管辖权的地方当局制定的要求或法规。本标准的用户有责任遵守所有此类要求和法规。 1.6 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 该技术适用于各种形式的干漆膜和清漆，包括完整的干漆膜表面、暴露所有漆层横截面的缺口或其他有角度的切割表面、漆屑和地面漆膜。 5.2 现场测试方法的响应取决于涂层基质中铅的可提取性，这可能取决于所用的测试试剂盒、测试的涂层类型和铅颜料的类型 ( 3. ) . 5.3 在某些情况下，金属和其他化学物质会干扰现场测试，导致假阴性或假阳性结果（见第节 8. ). 5.4 如果测试试剂盒的响应对在给定的预定水平（例如，监管行动水平）可靠地检测铅敏感，则可将现场测试结果用作油漆和清漆中铅含量的负屏 ( 4. ) . 5.5 本规程可与铅的定量和半定量分析方法结合使用，如阳极溶出伏安法或油漆芯片样品的光谱实验室分析，或原位油漆膜的便携式X射线荧光测试。 5.6 色盲者（主要观众）在观看红色方面有缺陷，可能很难辨别出阳性罗地松酸盐测试的粉色或红色。

1.1 This practice covers the use of commercial spot test kits based on either sulfide or rhodizonate for the qualitative determination of the presence of lead in dry paint films. 1.2 This practice may also be used as a qualitative procedure for other dry coating films such as varnishes. 1.3 This practice provides a list of the advantages and limitations of chemical spot test kits based on sulfide and rhodizonate to allow the user to choose the appropriate spot test for a given circumstance. 1.4 This practice contains notes which are explanatory and not part of mandatory requirements. 1.5 Methods described in this practice may not meet or be allowed by requirements or regulations established by local authorities having jurisdiction. It is the responsibility of the user of this standard to comply with all such requirements and regulations. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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. 1.8 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 technique is applicable to dry paint films and varnishes in a variety of forms including the intact dry paint film surface, a notched or other angular cut surface that exposes a cross section of all paint layers, a paint chip, and ground paint film. 5.2 The response of the spot test method varies depending on the extractability of lead from a coating matrix, which may differ depending on the test kit used, the coating type tested, and the type of lead pigment ( 3 ) . 5.3 In some situations, metals and other chemical species interfere with the spot tests causing false negative or false positive results (see Section 8 ). 5.4 A spot test result may be used as a negative screen for the presence of lead in paints and varnishes provided the response of the test kit is sensitive to detecting lead reliably at a given predetermined level, for example, a regulatory action level ( 4 ) . 5.5 This practice may be used in conjunction with quantitative and semi-quantitative analytical methods for lead such as anodic stripping voltammetry or spectroscopic laboratory analysis of paint chip samples, or portable X-ray fluorescence testing of in situ paint films. 5.6 Colorblind individuals (protanomalous viewers) who are deficient in viewing red colors may have difficulty in discerning the pink or red color of a positive rhodizonate test.