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为了更好地减少和避免磷化氢熏蒸散气时较高尾气浓度的危害风险,研究了紫外光和温湿度条件对磷化氢降解的影响。结果为:在温度25℃、相对湿度75%条件下,经过80 h后,黑暗条件下起始浓度100 mL/m3的磷化氢浓度下降至91.50 mL/m3,而采用波长365 nm和254 nm的紫外光连续照射后,其浓度分别下降至37.50 mL/m3和14.25 mL/m3;波长365 nm和254 nm紫外光连续照射磷化氢的浓度半衰期分别为48 h和24 h;在相对湿度75%,254 nm波长紫外光对起始浓度100 mL/m3的连续处理80 h后,温度分别为20℃、25℃和30℃时装置内磷化氢降解幅度分别为81.00%、86.25%和90.00%,说明温度升高可加快紫外光对磷化氢降解速率;55%和75%相对湿度对254 nm波长紫外光降解磷化氢的影响不明显。
In order to reduce and avoid the risk of high tailing concentration when phosphine was fumigated, the effects of UV light and temperature and humidity on the degradation of phosphine were studied. The results showed that under the conditions of 25 ℃ and 75% relative humidity, the concentration of phosphine with the initial concentration of 100 mL / m3 decreased to 91.50 mL / m3 after 80 h under dark conditions, but the wavelength was 365 nm and 254 nm The concentration of phosphine decreased to 37.50 mL / m3 and 14.25 mL / m3, respectively. The half-lives of phosphine at 365 nm and 254 nm UV irradiation were 48 h and 24 h respectively. When the relative humidity was 75 % And 254 nm wavelength ultraviolet light on the initial concentration of 100 mL / m3 for 80 h, the degradation of phosphine in the device was 81.00%, 86.25% and 90.00 respectively at 20 ℃, 25 ℃ and 30 ℃ %, Indicating that the temperature increase can speed up the UV degradation rate of phosphine; 55% and 75% relative humidity on 254 nm UV degradation of phosphine has no obvious effect.