SMALL, SELECTIVE MULTIVAPOR MONITORING INSTRUMENT

开发一种小型电池驱动的仪器， 识别和量化低ppm和亚ppm的有机蒸汽 提出了浓度。这台仪器的重量将不到一磅 并且大约是标准取样泵的大小。它将使用一个 聚合物涂层表面声波（SAW）微传感器阵列， 与用于蒸汽检测的微型预浓缩器结合。 温度和湿度补偿也将被纳入。的 从阵列获得的响应模式将用于识别 特定的蒸汽，并区分蒸汽混合物的成分。 实验室和现场测试”将展示直接 测量个人呼吸区浓度的范围广泛的 有机蒸气和蒸气混合物。它也将表明，与轻微 修改后的仪器可用于评估屏障 化学防护服样品的有效性。因此，它可以 作为复杂、昂贵的分析仪的简单替代品， 涉及潜在接触的应急工作情况 未知液体混合物结合上述工作， 计算机化的决策逻辑将使用多变量 统计和蒙特卡罗模拟，以确定最佳的 传感器，包括在传感器阵列中，用于任何蒸汽分析问题，以及 用于预测仪器在精度方面的性能 识别和量化。当前个人监测 仪器无法提供多种有机物的选择性分析 蒸汽 通过提供这种能力，拟议的文书将 提高所需的个人暴露数据的数量和质量， 表征有机蒸气暴露的分布， 工人和确定是否符合公认的接触限值。它将 也有助于雇主努力满足OSHA规定的要求 用于记录防护服的屏障有效性， 预防接触性皮肤病和由皮肤引起的全身效应 吸收有毒化学物质。

The development of a small, battery-operated instrument capable of identifying and quantifying organic vapors at low- and sub-ppm concentrations is proposed. The instrument will weigh less than one pound and will be about the size of a standard sampling pump. It will employ an array of polymer-coated surface-acoustic-wave (SAW) microsensors in conjunction with a miniature preconcentrator for vapor detection. Temperature and humidity compensation will also be incorporated. The patterns of responses obtained from the array will be used to identify specific vapors and to discriminate the components of vapor mixtures. Laboratory and field testing 'will demonstrate the capability for direct measurement of personal breathing-zone concentrations of a broad range of organic vapors and vapor mixtures. It will also be shown that with slight modification the instrument can be used to assess the barrier effectiveness of chemical protective clothing samples. It could thus serve as a simple alternative to complex, expensive analyzers in routine or emergency-response work situations involving potential contact with unknown liquid mixtures. In conjunction with the work just described, a computerized decision logic will be developed using multivariate statistics and Monte Carlo simulations, for determining the optimal set of sensor to include in the sensor array for any vapor analysis problem and for predicting the performance of the instrument in terms of the accuracy of identification and quantification. Current personal monitoring instrumentation cannot provide selective analysis of multiple organic vapors. By providing such capabilities, the proposed instrument will improve the quantity and quality of personal exposure data needed for characterizing the distributions of organic-vapor exposures received by workers and determining compliance with accepted exposure limits. It will also facilitate efforts by employers to meet OSHA-mandated requirements for documenting the barrier effectiveness of protective clothing used to prevent contact dermatoses and systemic effects arising from dermal absorption of toxic chemicals.