Abstract
Chloroderivatives such as, 1,1,1-trichloroethane (C 2H 3Cl 3) carbontetrachloride (CCl 4), trichloroethylene (C 2HCl 3) and tetrachloroethylene (C 2Cl 4) in air were analyzed intermittently every half hour by ECD-gas chromatography with a programmed automatic gas inlet system for about seven weeks. The results showed a washout effect by rain related to the solubility in water. Decreases in daytime on clear days was demonstrated in the diurnal variation of C 2H 3Cl 3 from the statistical analysis, while distinct reduction of CCl 4 in daytime on clear days was not observed. On clear days, C 2HCl 3 showed the largest reduction while CCl 4 showed the least among C 2H 3Cl 3, CCl 4 and C 2HCl 3. This is compatible with conjectures from the reactivity with air pollutants such as NO,NO 2 and OH radicals in simulated photochemical chambers.
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