SMALL, SELECTIVE MULTIVAPOR MONITORING INSTRUMENT

一种由电池供电的小型仪器的研制 识别和量化低和亚百万分率的有机蒸气 提出了浓缩剂的概念。这台仪器的重量将不到一磅 大约是一个标准取样泵的大小。它将雇佣一名 聚合物涂覆声表面波(SAW)微传感器阵列 与微型预浓缩器相结合，用于蒸汽检测。 温度和湿度补偿也将纳入其中。这个 将使用从阵列获得的响应模式来识别 对特定蒸气进行分析，并区分混合蒸气的成分。 实验室和现场测试将展示直接测试的能力 个人呼吸区浓度的测量.大范围的 有机蒸气和蒸气混合物。它还将显示，以轻微的 改装后的仪器可以用来评估屏障 化学防护服样品的有效性。因此，它可以服务于 作为常规或常规的复杂、昂贵的分析仪的简单替代 涉及潜在接触的应急工作情况 未知的液体混合物。与刚才描述的工作相结合， 将使用多变量开发计算机化决策逻辑 统计和蒙特卡罗模拟，用于确定最优的 传感器包括在传感器阵列中，用于任何气体分析问题 从精度的角度预测仪器的性能 识别和量化。当前的个人监控 仪器不能提供多种有机物质的选择性分析 水蒸气。通过提供这些能力，拟议的文书将 提高所需的个人暴露数据的数量和质量 描述了由以下人员接收的有机蒸气暴露的分布 并确定是否符合可接受的接触限值。会的 还促进雇主努力满足OSHA规定的要求 用于记录防护服的屏障效果 预防接触性皮肤病和皮肤引起的全身影响 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.