Detection of organophosphate pesticides using a prototype liquid crystal monitor.
Detection of organophosphate pesticides using a prototype liquid crystal monitor.
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使用原型液晶监测仪检测有机磷农药。
DOI：
10.1039/b806954a
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Bonds,MichaelD
中科院分区：
文献类型：
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作者：
Adgate,JohnL;Bartekova,Andrea;Raynor,PeterC;Griggs,JGirard;Ryan,AndrewD;Acharya,BharatR;Volkmann,CarlaJ;Most,DarrinD;Lai,Siyi;Bonds,MichaelD
通过一系列的实验室实验，研究了一种用于测量空气中有机磷农药浓度的可穿戴式液晶监测仪（LCM）的精密度和准确度。将LCM对气相和气溶胶二嗪农的响应与使用标准参考方法（NIOSH 5600）在2至80小时的持续时间内在108至108 ppb（十亿分之一）的浓度范围内获得的浓度进行比较。改变温度（25 ° C、30 ° C和35 °C）和相对湿度（15%、50%和85%），以估计这些因素对LCM性能的影响。LCM对气相农药暴露的响应在8-20 ppb浓度范围内呈线性。然而，在暴露浓度超过1.20 ppb时，监测器响应和测量精度下降。升高的温度提高了二嗪农蒸气测量精度，而增加相对湿度降低了LCM在极端测试温度下的响应。与仅暴露于蒸汽相比，LCM对二嗪农气溶胶浓度不太敏感，但在相对较大的暴露范围（29至1190 ppb-小时）内显示出合理的精度。进一步努力描述温度和湿度效应并提高低端灵敏度，可能会为这类广泛使用的农药提供便携式个人接触监测器或环境传感器。
The precision and accuracy of a prototype wearable liquid crystal monitor (LCM) for the measurement of airborne organophosphate pesticide concentrations was explored in a series of laboratory experiments. LCM response to vapor-phase and aerosol diazinon was compared to concentrations obtained using a standard reference method (NIOSH 5600) at concentrations ranging from ∼8 to 108 ppb (parts per billion) over durations of 2 to 80 hours. Temperature (∼25, 30, and 35 °C) and relative humidity (15, 50, and 85%) were varied to estimate the effect of these factors on LCM performance. The LCM response to vapor phase pesticide exposure was linear for concentrations in the range of 8–20 ppb. At exposure concentrations above ∼20 ppb, however, there was a decline in monitor response and measurement precision. Elevated temperatures improved diazinon vapor-only measurement precision, while increased relative humidity reduced LCM response at the extremes of tested temperatures. Compared to vapor-only exposures, the LCM was less sensitive to diazinon aerosol concentrations, but displayed reasonable precision over a relatively large range of exposures (29 to 1190 ppb-hr). Further efforts to characterize temperature and humidity effects and improve low-end sensitivity would likely provide a portable personal exposure monitor or environmental sensor for this widely used class of pesticides.