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  • 02월 26일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제115회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Evaluation of the consumer exposure to two isothiazolinone biocides, 5-chloro-2-methylisothiazol-3(2H)-one (CMI) and 2-methylisothiazol-3(2H)-one (MI), in a liquid air freshener

2015년 2월 25일 13시 48분 55초
ENVR.P-1295 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 15일 (수요일) 16:00~19:00
저자 및
박선경, 권정환1,*
고려대학교 환경생태공학과, Korea
1고려대학교 환경생태공학부, Korea
There exist public concerns about wide-spread use of isothoazolinone biocides added to various consumer products such as air fresheners, personal hygene products, perfumes, and deodorants.Two most-widely used isothiazolinones,5-chloro-2-methylisothiazol-3(2H)-one(CMI) and 2-methylisothiazol-3(2H)-one(MI),are suspected to undergo chemical transformation under ambient use conditions. However, there are only limited studies about their reactivity and the rate and pathways of transformation.Hydrolysis at pH 4, 7, and 9 and photolysis testsusing a 50 W three wavelengths compact fluorescent lampwere performed to evaluate their stability in liquid products.Hydrolysis and phototransformation rate constants were not quantifiable except for the hydrolysis of CMI at pH 9 with the rate constant of 0.032 day-1.To better understand human exposure to MI and CMI while using consumer products, we evaluated vaporization of MI and CMI from a selected air freshener. Specifically, the mass transfer rate constant for evaporation was evaluated in a custom-made chamber. Whereas evaporation of MI was almost negligible for 7 days, significant amount of CMI evaporated with the evaporation mass transfer coefficient of 0.0071 cm day-1 for the same test period likely due to higher Henry’s law constant. Because the volume of air freshener decreases over time due to evaporation of water, concentration of MI in the product showed noticeable increase whereas concentration of CMI remained constant due to evaporation.Exposure assessment was also conducted using an exposure scenario and measured rate constants in this study.