本powerpoint演示介绍了马萨诸塞州水资源管理局（MWRA）在臭氧处理过的水样中氰化物的检测中遇到的问题。MWRA开展了一项研究，以确定样本中是否真的含有氰化物，或者是否含有氰化物 在样品容器中形成 在保存和储存期间。文献检索发现 越来越多的证据表明，尤其是在互联网上 废水方面，氰化物可以在 瓶子陈述中的假设是 保存中断了一系列的 化学反应 甲醛，臭氧消毒副产品（DBP），以及 通常情况下 将甲醛转化为CN-to 氯化氰（CNCl）和 无毒氰酸盐（CNO-）。介绍了实验室规模的实验和结果，结果表明:未标样和加标样形成 2至10天内可检测到氰化物 储存量； 这两种硫代硫酸盐都发生了 抗坏血酸脱氯；和 硫代硫酸盐的命中率是原来的两倍， 而且比 抗坏血酸。介绍了使用微差管进行的现场实验，结果表明，只有在 传统的方法已经被检测到 氰化物的含量。这些研究得出的结论: 氰化物可以在保存的容器中形成 饮用水样本； 甲醛似乎会刺激皮肤 氰化物形成；和 微区稳定样品 现场安装试管，不升高至pH值 12似乎可以避免氰化物 组成包括数字。

This powerpoint presentation looks at a problem that the Massachusetts Water Resources Authority (MWRA) had with how hits for cyanide in ozone-treated water samples. MWRA set up a study on whether cyanide was really in the samples, or was it forming in the sample container during preservation and storage. A literature search found that there is growing evidence, especially on the wastewater side, that cyanide can form in the bottle. The hypothesis as stated in the presentation was that preservation interrupts a series of chemical reactions between formaldehyde, an ozone disinfection byproduct (DBP), and chlorine/chloramines that normally convert formaldehyde into CN- to cyanogen chloride (CNCl), and on to non-toxic cyanate (CNO-). A bench-scale experiment and results are presented, that showed: unspiked and spiked samples formed detectable cyanide over 2 to 10 days of storage; this happened with both Thiosulfate and Ascorbic acid dechlorination; and, Thiosulfate had twice as many hits, and higher concentration hits, than Ascorbic Acid. The on-site experiment is presented, using a Micro Dist Tube, with results indicating that only the samples handled in the conventional way had detectable amounts of cyanide. Conclusion from these studies: cyanide can form in preserved drinking water samples; formaldehyde appears to stimulate cyanide formation; and, stabilizing samples in MICRO DIST tubes on-site, without raising to pH 12 appears to avoid cyanide formation. Includes figures.