SELECTIVE REAL-TIME DETECTION OF OLEFIN GASES AND VAPORS

目前可用的有机气体个人直接读数仪器 并且蒸汽受到传感元件的不良选择性的限制 就业。测定各组分的浓度 甚至简单的混合物通常也是不可能的。因此，需要 工业卫生监测传感器技术的改进 应用.高选择性化学微传感器的研制 和相关的微仪器将大大提高我们的能力， 描述和控制职业接触有毒化学品的情况。 我们建议开发一种紧凑的原型仪器， 涂层表面声波（SAW）化学微传感器，以实现 选择性地实时测量以下每种烯烃气体 和蒸气：丙烯腈，丁二烯，β-氯丁二烯，丙烯酸乙酯， 苯乙烯、氯乙烯和偏二氯乙烯。这些目标烯烃 由于其潜在的致癌性、神经毒性和/或 对生殖健康的不利影响。对给定靶点的选择性 将通过用一种 几种有机铂试剂，设计用于与 这种烯烃。初步研究表明， 试剂中的配体导致对某些化合物的选择性反应性， 在其它烯烃和非烯烃共污染物的存在下， 此外，在彻底暴露后，原始捕获试剂 可以通过简单的化学处理原位再生， 重复使用传感器。 一种具有集成表面加热元件的双97-MHz SAW器件， 将在我们的实验室中制造总面积为0.8cm2的材料。的 原型仪器将由单板计算机构成， 修改以容纳SAW微传感器和相关电路。 该仪器将配备数据存储和数字读出 实时和时间加权平均测量能力。 仪器性能将使用动态测试大气进行评估 关于几个相关的操作参数。

Currently available personal direct-reading instruments for organic gases and vapors are limited by the poor selectivity of the sensing components employed. Determination of the concentrations of individual components of even simple mixtures is generally not possible. Thus, there is a need for improvements in sensor technology for industrial hygiene monitoring applications. The development of highly selective chemical microsensors and associated microinstrumentation would greatly improve our ability to characterize and control occupational exposures to toxic chemicals. We propose to develop a compact prototype instrument that utilizes a coated surface-acoustic-wave (SAW) chemical microsensor to achieve selective, real-time measurement of each of the following olefin gases and vapors: acrylonitrile, butadiene, beta-chloroprene, ethylacrylate, styrene, vinyl chloride, and vinylidene chloride. These target olefins were chosen due to their potential carcinogenic, neurotoxic, and/or adverse-reproductive health effects. Selectivity for a given target olefin will be achieved by coating the surface of the SAW device with one of several organoplatinum reagents designed to react specifically with that olefin. Preliminary studies have shown that subtle changes of the ligands in the reagent result in selective reactivity toward certain olefins in the presence of other olefin and non-olefin co-contaminants. Furthermore, following exhaustive exposure the original trapping reagent can be regenerated, in situ, by simple chemical treatment, permitting repeated use of the sensor. A dual 97-MHz SAW.device having an integrated surface heating element and an overall area of 0.8 cm2 will be fabricated in our laboratory. The prototype instrument will be constructed from a single-board computer, modified to accomodat the SAW microsensor and the associated circuitry. The instrument will be equipped with data-storage and digital-readout capabilities for both real-time and timeweighted-average measurements. Instrument performance will be evaluated using dynamic test atmospheres with respect to several relevant operating parameters.