涂料和清漆.防污涂料中生物杀灭剂释放率的测定.第5部分:通过萃取物中二甲基甲苯基硫胺(DMST)和二甲基苯基硫胺(DMSA)浓度的测定计算甲苯氟磺胺苯氟磺胺的释放率

[中文适用范围]： 本部分 ISO 15181 规定了测定防污漆中托利氟胺和双氯氟胺释放到人工海水中的量的仪器和分析方法，该测定按照 ISO 15181-1 中给出的程序进行。托利氟胺和双氯氟胺在海洋环境中不稳定，会降解形成二甲托利磺酰胺 (DMST) 和二甲苯磺酰胺 (DMSA)。本部分 ISO 15181 规定了将这些释放物种转化为这些降解产物、测定其在处理过的人工海水样品中的浓度，并给出在指定实验室条件下托利氟胺和双氯氟胺释放率的最终计算方法。本部分 ISO 15181 旨在允许通过分析根据 ISO 15181-1 生成的单独人工海水提取物的子样品，同时测定给定防污漆释放的托利氟胺、双氯氟胺和其他杀生物剂（例如铜）。当与 ISO 15181-1 结合使用时，该方法测定释放率的实用限制范围为 1.3 µg·cm⁻²·d⁻¹ 至 500 µg·cm⁻²·d⁻¹。测定低于此范围的释放率需要使用对人工海水中托利氟胺、双氯氟胺或两者（视情况而定）具有更低定量限的分析方法，该定量限低于第 3 章和 5.1 中规定的方法。 [外文原描述]： ISO 15181-5:2008 specifies the apparatus and analytical method for determining the amount of tolylfluanid and dichlofluanid that has been released from an antifouling paint into artificial seawater in accordance with the procedure given in ISO 15181-1. Tolylfluanid and dichlofluanid are unstable in the marine environment and degrade to form dimethyltolylsulfamide (DMST) and dimethylphenylsulfamide (DMSA) respectively. ISO 15181-5:2008 specifies a method for converting the released species into these degradation products, quantifying their concentration in the treated artificial seawater samples, and gives the final calculation for the release rate of tolylfluanid and dichlofluanid under the specified laboratory conditions. ISO 15181-5:2008 is designed to allow the concurrent determination of tolylfluanid, dichlofluanid and other biocides that can be released by a given antifouling paint (for example, copper) through the analysis of separate sub-samples of an artificial seawater extract generated in accordance with ISO 15181-1. When used in conjunction with ISO 15181-1, the practical limits for quantifying release rates by this method are from 1,3 micrograms per square centimetre per day to 500 micrograms per square centimetre per day. The quantitation of release rates lower than this range will require the use of an analytical method with a lower limit of quantitation for tolylfluanid, dichlofluanid, or both (as appropriate) in artificial seawater