Open AccessLaboratory study on heterogeneous degradation of methyl chloroform (CH 3 CCl 3 ) on aluminosilica clay minerals as its potential tropospheric sink
Author(s) -
Kutsuna Shuzo,
Takeuchi Koji,
Ibusuki Takashi
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/1999jd901072
Subject(s) - allophane , halloysite , chloroform , chemistry , sink (geography) , degradation (telecommunications) , clay minerals , partition coefficient , relative humidity , nuclear chemistry , environmental chemistry , mineralogy , materials science , organic chemistry , physics , thermodynamics , telecommunications , cartography , computer science , composite material , geography
Heterogeneous reactions of methyl chloroform (1,1,1‐trichloroethane, CH 3 CCl 3 ) with alminosilica clay particles were examined between 288 and 313 K as a potential sink. Allophane and halloysite particles exhibited the activity to transform CH 3 CCl 3 to 1,1‐dichloroethene (CH 2 = CCl 2 ). The dependence of the reaction rate on the pretreatment, temperature, and relative humidity suggested that the reaction could proceed under environmental conditions. Illumination of light with wavelength longer than 300 nm did not affect CH 3 CCl 3 decay but caused heterogeneous degradation of CH 2 = CCl 2 on clay particles. The lower limit of overall sticking coefficient for fresh allophane and halloysite particles was estimated to be 6×10 −9 and 1.1×10 −8 , respectively. Heterogeneous degradation of CH 3 CCl 3 on mineral aerosols and/or soils is worth taking into consideration in deriving tropospheric OH concentrations from global budget concentrations of CH 3 CCl 3 .