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BACKGROUND:Silicon tetrachloride reactswithmoisture in the atmosphere to generate hydrogen chloride, which affects the environment. Since silicon tetrachloride and its by-products are dispersed in the atmosphere in a short time after the silicon tetrachloride release into the atmosphere, it is difficult to directly assess the extent of environmental impact. In the present study, the exposure test of silicon tetrachloride or hydrogen chloridewas examined in order to establish the criterion of the range affected by the silicon tetrachloride release, and the actual crops in the area exposed to silicon tetrachloride leakage were analyzed. METHODSANDRESULTS:For theexperiment of exposure to silicon tetrachloride or hydrogen chloride, the leaves of red-pepper and cornwere used in glass sealed containers. In the actual accident area, 59 samples from10different kinds of cropswere collected. The pretreatment of the samplewas performed by freezing and grinding, and then extracted using distilledwater. The pHand concentration of chloride (Cl) ion of the extracted solution were measured using pH meter and ion chromatograph, respectively. CONCLUSION: Exposure to silicon tetrachloride caused visible damage, increasing the concentration of chloride ion, and decreasing the pH as well as hydrochloric acid. In the actual crops of the affected area, the tendency was the same as the result of the laboratory test, and the range of influence could be estimated through the concentration of Cl ion over 2,000 mg/kg, and the correlation evaluation between the concentration of Cl and pH. Therefore, the concentration of Cl ion and the correlation betweenCl and pH would be considered as the factors to estimate the influence range of silicon tetrachloride release.

Evaluation of Exposure Indicators for Plants by Silicon Tetrachloride Release