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首页> 外文期刊>Journal of Polymers and the Environment >Degradation of Monophenylheptamethylcyclotetrasiloxane and 2,6-cis-Diphenylhexamethylcycloterasiloxane in Londo Soil
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Degradation of Monophenylheptamethylcyclotetrasiloxane and 2,6-cis-Diphenylhexamethylcycloterasiloxane in Londo Soil

机译：伦敦土壤中单苯基七甲基环四硅氧烷和2,6-顺-二苯基六甲基环四硅氧烷的降解

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摘要

The natural degradation of monophenylheptamethylcyclotetrasiloxane and 2,6-cis-diphenylhexa-methylcyclotetrasiloxane in soil was evaluated under laboratory conditions. Both monophenyl and 2,6-cis underwent rapid degradation in dry soil generating the same products in varying proportions. During the first 24 hr, approximately 99% of the two materials underwent significant chemical transformations forming silanols of various structures, dimethyl cyclic siloxanes of the structure (Me_2SiO)x, and rearrangement products (geometrical isomers) of diphenylhexamethylcyclotetrasi-loxane. Among the silanols, the following were identified as trimethylsilyl derivatives: HOSiMe_2OH, HOSiMePhOH, HOSiMe_2OSiMe_2OH, HOSiMePhOSiMe_2OH, HOSiMePhOSiMePhOH, HOSi-Me_2OSiMe_2OSiMe_2OH, HOSiMePhOSiMe_2OSiMe_2OH, HOSiMe_2OSiMePhOSiMe_2OH, HOSi-MePhSiMe_2OSiMePhOH, HOSiMePhOSiMePhOSiMe_2OH, HOSiMePhOSiMe_2OSiMe_2OSi-Me_2OH, HOSiMe_2OSiMePhOSiMe_2OSiMe_2OH, HOSiMePhOSiMe_2OSiMePhOSiMe_2OH, HOSi-MePhOSiMePhOSiMe_2OSiMe_2OH, HOSiMePhOSiMe_2OSiMe_2OSiMePhOH, HOSiMe_2OSiMePh-OSiMePhOSiMe_2OH. Derivatization was carried out using bis(trimethylsilyl)trifluoroacetamide. Gas chromatography-mass spectrometry and liquid chromatography-mass spectrometry (atmospheric pressure chemical ionization) analyses were used to derive structures. Structures were confirmed by gas chromatography-mass spectrometry comparisons of synthetic standards. Degradation was slower in wet soil. Nevertheless, in 14 days, the chemical transformation was essentially found to be complete as soil was allowed to dry. Detection of phenol as one of the degradation products revealed the occurrence of carbon-silicon bond cleavage promoted by soil.
机译：在实验室条件下，评估了土壤中单苯基七甲基环四硅氧烷和2,6-顺式二苯基六甲基甲基环四硅氧烷的自然降解。单苯基和2,6-顺式在干燥的土壤中均迅速降解，产生不同比例的相同产物。在最初的24小时内，两种材料中约有99％经历了显着的化学转化，形成了各种结构的硅烷醇，结构（Me_2SiO）x的二甲基环硅氧烷和二苯基六甲基环四硅氧烷的重排产物（几何异构体）。在这些硅烷醇，下面分别鉴定为三甲基甲硅烷衍生物：HOSiMe_2OH，HOSiMePhOH，HOSiMe_2OSiMe_2OH，HOSiMePhOSiMe_2OH，HOSiMePhOSiMePhOH，HOSi-Me_2OSiMe_2OSiMe_2OH，HOSiMePhOSiMe_2OSiMe_2OH，HOSiMe_2OSiMePhOSiMe_2OH，HOSi-MePhSiMe_2OSiMePhOH，HOSiMePhOSiMePhOSiMe_2OH，HOSiMePhOSiMe_2OSiMe_2OSi-Me_2OH，HOSiMe_2OSiMePhOSiMe_2OSiMe_2OH，HOSiMePhOSiMe_2OSiMePhOSiMe_2OH，HOSi-MePhOSiMePhOSiMe_2OSiMe_2OH，HOSiMePhOSiMe_2OSiMe_2OSiMePhOH， HOSiMe_2OSiMePh-OSiMePhOSiMe_2OH。使用双（三甲基甲硅烷基）三氟乙酰胺进行衍生。气相色谱-质谱和液相色谱-质谱（大气压化学电离）分析被用来得出结构。通过气相色谱-质谱法对合成标准品进行比较来确认结构。在潮湿的土壤中降解速度较慢。然而，在14天之内，发现土壤干燥后化学转化基本完成。苯酚作为降解产物之一的检测揭示了土壤促进的碳-硅键裂解的发生。

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