涂料和清漆.防虫涂料中杀虫剂释放速率的测定.第3部分:通过测定萃取物中乙烯硫脲浓度计算乙烯基双二硫代氨基甲酸锌(代森锌)的释放率

[中文适用范围]： ISO 15181 的这一部分规定了根据 ISO 15181-1 中给出的程序测定从防污涂料释放到人造海水中的代森锌量的仪器和分析方法。 代森锌以离子亚乙基双（二硫代氨基甲酸盐）的形式从防污涂料中释放出来，在海洋环境中不稳定。 ISO 15181的这一部分描述了将释放的物质转化为稳定的降解产物亚乙基硫脲并测定其在处理过的人造海水样品中的浓度的方法，并给出了在指定实验室条件下代森锌释放率的最终计算。 ISO 15181 的这一部分旨在通常允许通过分析按照以下标准生成的人造海水提取物的单独子样品，同时测定代森锌和其他杀菌剂，这些杀菌剂可以由给定的防污涂料（例如铜）释放。 ISO 15181-1 中给出的程序。 当与 ISO 15181-1 结合使用时，通过该方法定量测量释放率的实际限值为 2.9 μg·cm–2·d–1 至 500 μg·cm–2·d–1。 低于此范围的释放速率的定量测量将需要使用人造海水中亚乙基硫脲定量限低于 5.1 中规定的限值的分析方法。 [外文原描述]： ISO 15181-3:2007 specifies the apparatus and analytical method for determining the amount of zineb that has been released from an antifouling paint into artificial seawater in accordance with the procedure given in ISO 15181-1. Zineb is released from antifouling paints in the form of ionic ethylene-bis(dithiocarbamate) which is unstable in the marine environment. This part of ISO 15181 describes a method for converting the released species into a stable degradation product, ethylenethiourea, and determining its concentration in the treated artificial seawater samples, and gives the final calculation for the release rate of zineb under the specified laboratory conditions. This part of ISO 15181 is designed to generally allow the concurrent determination of zineb 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 the procedure given in ISO 15181-1. When used in conjunction with ISO 15181-1, the practical limits on the quantitative measurement of release rates by this method are from 2,9 micrograms per square centimetre per day to 500 micrograms per square centimetre per day. The quantitative measurement of release rates below this range will require the use of an analytical method with a lower limit of quantitation for ethylenethiourea.