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首页> 外文期刊>Environmental Science & Technology >Laboratory Setup for Long-Term Monitoring of the Volatilization of Hazardous Materials: Preliminary Tests of O-Ethyl S-2-N,N-Diisopropylamino)ethyl Methylphosphonothiolate on Asphalt
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Laboratory Setup for Long-Term Monitoring of the Volatilization of Hazardous Materials: Preliminary Tests of O-Ethyl S-2-N,N-Diisopropylamino)ethyl Methylphosphonothiolate on Asphalt

机译：长期监控有害物质挥发的实验室设置：硫代磷酸O-乙基S-2-N，N-二异丙氨基氨基）乙酯甲基膦酸酯的初步测试

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摘要

Contrary to commonly used pesticides, the rate of volatilization of extremely toxic chemicals such as the nerve agent 0-ethyl S-2-(N,N-diisopropylamino)ethyl methylphosphonothiolate (VX) cannot be readily obtained under environmental conditions due to its high mammalian toxicity that would require extraordinary precautions, An alternative is a laboratory setup that would be used to obtain environmentally relevant data required for risk assessment studies. In this paper we describe a newly designed climatic hood that enables control of temperature, humidity, and air velocity within less than ±0.5% fluctuations during continuous operation. The performance of the evaporation system together with the sampling and analytical procedures produced a meaningful concentration profile of vapors obtained from a 15 mg sample of VX dispersed as small droplets over a 10×16 cm piece of asphalt road. The released vapors amounted to approximately 30% of the applied mass, and its time course was best fitted to a triexponential curve with rate constants changing overtime from 2.2 to 0.03 h{sup}(-1). The asphalt enhanced a specific degradation pathway of VX that is relatively minor in aqueous solutions. Results provide the first data on the volatilization of VX from samples of asphalt road, and offer an insight into VX behavior in the environment.
机译：与常用农药相反，由于其哺乳动物高，因此在环境条件下无法轻易获得毒性极强的化学药品的挥发速率，例如神经毒剂0-乙基S-2-（N，N-二异丙基氨基）乙基甲基硫代磷酸酯（VX）毒性，需要采取特殊的预防措施，另一种方法是使用实​​验室设置，以获取风险评估研究所需的与环境相关的数据。在本文中，我们描述了一种新设计的气候罩，该罩能够在连续运行期间将温度，湿度和空气速度控制在小于±0.5％的波动范围内。蒸发系统的性能以及采样和分析程序产生了有意义的蒸气浓度分布图，该蒸气分布是从15 mg VX样品以小滴形式分散在10×16 cm的柏油路上获得的。释放的蒸气约占所施加质量的30％，其时间过程最适合三指数曲线，其速率常数随时间从2.2变为0.03 h {sup}（-1）。沥青增强了VX的特定降解途径，该途径在水溶液中相对较少。结果提供了有关沥青路面样品中VX挥发的第一个数据，并提供了对VX在环境中行为的了解。

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