Palmes E D, Tomczyk C
Am Ind Hyg Assoc J. 1979 Jul;40(7):588-91. doi: 10.1080/15298667991430028.
A personal sampler system for NOx (NO + NO2) and NO2 has been developed for monitoring workplace air. The NO2 sampler previously reported from this laboratory uses triethanolamine to trap NO2 which diffuses through a tube of appropriate dimensions. The NOx sampler contains the same elements as the NO2 device, but it is also fitted with a chromic acid impregnated disc; this disc converts NO to NO2 which is then trapped by the triethanolamine along with preformed NO2. The trapped NO2 in all cases is determined as nitrite colorimetrically and NO is measured by difference between the NOx and NO2 values. The NOx sampler gives accurate and reproducible results if the chromic acid disc is in place for 24 hours or less; it is necessary, therefore, to insert and remove the disc within reasonably short times before and after sampling. We believe, however, that this operation will not be a serious problem for the user.
已开发出一种用于监测工作场所空气中氮氧化物（NO + NO₂）和二氧化氮的个人采样系统。本实验室之前报道的二氧化氮采样器使用三乙醇胺来捕集通过适当尺寸的管子扩散进来的二氧化氮。氮氧化物采样器包含与二氧化氮装置相同的部件，但还装有一片浸有铬酸的圆盘；该圆盘将一氧化氮转化为二氧化氮，然后二氧化氮与预先形成的二氧化氮一起被三乙醇胺捕集。在所有情况下，捕集到的二氧化氮通过比色法测定为亚硝酸盐，一氧化氮则通过氮氧化物和二氧化氮值之间的差值来测量。如果铬酸圆盘放置24小时或更短时间，氮氧化物采样器能给出准确且可重复的结果；因此，有必要在采样前后相当短的时间内插入和取出圆盘。不过，我们认为这种操作对使用者来说不会是一个严重问题。
