대기 중 유기염소계 살충제의 식물(부추)에 대한 침착 특성
Deposition Characteristics of Atmospheric Organochlorine Pesticides on Plant(Allum tuberosum)
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It was studied in this paper to investigate the deposition characteristics of atmospheric organochlorine pesticides( OCPs, heptachlor-epoxide, α/γ-chlordane, α/γ-hexachlorocyclohexane, , p,p'-DDT and p,p'-DDE) on plant(Allum tuberosum). OCPs concentrations in ambient air and plant were measured every two weeks from July to October. It was observed that the ambient air concentrations of OCPs were increased with increasing temperature and vapor pressure of OCPs, with decreasing LogKoa of chemicals. But the deposited plant concentrations of OCPs were increased with decreasing temperature, with increasing LogKoa of compounds. OCPs was deposited in plant from air since the plant-air fugacity quotients (fplant/fair) of OCPs is lower than 1 in summer. However, it was known that plant is a secondary pollution source of OCPs in air since fplant/fair of OCPs is greater than 1 in fall. Generally the trend of fplant/fair were decreased with increasing LogKoa of compounds. The slope and determination coefficient (R²) of regression line between plant-air concentration ratio[Log(Cp/Ca)] and Log(Koa) in fall were greater than those in summer. In this study, it were revealed that the relationship between plant-air fugacity quotients (fplant/fair) and LogKoa, and between plant-air concentration ratio[Log(Cp/Ca)] and LogKoa of OCPs was smaller than those of PCDD/Fs and PCBs which are homologue compounds.
Abstract
It was studied in this paper to investigate the deposition characteristics of atmospheric organochlorine pesticides( OCPs, heptachlor-epoxide, α/γ-chlordane, α/γ-hexachlorocyclohexane, , p,p'-DDT and p,p'-DDE) on plant(Allum tuberosum). OCPs concentrations in ambient air and plant were measured every two weeks from July to October. It was observed that the ambient air concentrations of OCPs were increased with increasing temperature and vapor pressure of OCPs, with decreasing LogKoa of chemicals. But the deposited plant concentrations of OCPs were increased with decreasing temperature, with increasing LogKoa of compounds. OCPs was deposited in plant from air since the plant-air fugacity quotients (fplant/fair) of OCPs is lower than 1 in summer. However, it was known that plant is a secondary pollution source of OCPs in air since fplant/fair of OCPs is greater than 1 in fall. Generally the trend of fplant/fair were decreased with increasing LogKoa of compounds. The slope and determination coefficient (R²) of regression line between plant-air concentration ratio[Log(Cp/Ca)] and Log(Koa) in fall were greater than those in summer. In this study, it were revealed that the relationship between plant-air fugacity quotients (fplant/fair) and LogKoa, and between plant-air concentration ratio[Log(Cp/Ca)] and LogKoa of OCPs was smaller than those of PCDD/Fs and PCBs which are homologue compounds.
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