Determination of octanol-air partition coefficients and supercooled liquid vapor pressures of organochlorine pesticides
Determination of octanol-air partition coefficients and supercooled liquid vapor pressures of organochlorine pesticides
复制标题
DOI：
10.1080/03601230903163590
复制
发表时间：
2009-09
期刊：
影响因子：
--
通讯作者：
N. Zhang;Yu Yang;Yu Liu;S. Tao
中科院分区：
文献类型：
--
作者：
N. Zhang;Yu Yang;Yu Liu;S. Tao
采用气相色谱保留时间法测定了p，p′-DDE、p，p ′-DDD、o，p′-DDT、o，p ′-DDE、o，p′-DDD、α-HCH、β-HCH、γ-HCH、δ-HCH等9种有机氯农药（OCPs）的辛醇-空气分配系数（KOA）和过冷液体蒸气压（PL）随温度的变化。其中首次测定了邻，p′-DDE和邻，p′-DDD的KOA和邻，p ′-DDE、邻，p′-DDD、β-HCH和δ-HCH的PL。在25°C下，所研究化合物的KOA和PL值分别为3.14 × 107（α-HCH）至3.76×109（p，p′-DDD）和8.95×10− 4 Pa（p，p′-DDD）至1.08×10− 1 Pa（α-HCH）。KOA和PL数据与已发表的数据进行了比较。在25°C下，o，p′-DDT的KOA值为3.23×109，高于o，p′-DDE（1.02×109）和o，p′-DDD（2.01×109），表明o，p′-DDT比其代谢产物更易在土壤中分配。o，p′-DDE和o，p ′-DDD与p，p′-同分异构体相比，KOA值较低，PL值较高，导致这些异构体的行为和归宿存在潜在差异。不同化学品间的差异较大，表现为KOA值依次增大，PL值依次减小，α-HCH> γ-HCH> β-HCH> δ-HCH> o，p′-DDE> p，p′-DDE> o，p′-DDD> o，p′-DDT> p，p′-DDD。对于每种化合物，LogKOA与绝对温度的倒数呈线性下降，而LogPL与绝对温度的倒数呈显著正相关。本研究表明，气相色谱保留时间法是测定多种有机氯农药的KOA和PL的合适方法。
Octanol-air partition coefficients (KOA) and supercooled liquid vapor pressures (PL) of nine organochlorine pesticides (OCPs) including p,p′-DDE, p,p′-DDD, o,p′-DDT, o,p′-DDE, o,p′-DDD, α-HCH, β-HCH, γ-HCH, δ-HCH were determined as functions of temperature using a gas chromatographic retention time method. Among them, the KOA of o,p′-DDE and o,p′-DDD and the PL of o,p′-DDE, o,p′-DDD, β-HCH and δ-HCH were determined for the first time. The determined KOA and PL values of investigated compounds at 25°C ranged from 3.14 × 107 (α-HCH) to 3.76×109 (p,p′-DDD), and 8.95×10− 4 Pa (p,p′-DDD) to 1.08×10− 1 Pa (α-HCH), respectively. The KOA and PL data were compared with published data. The KOA values of o,p′-DDT at 25°C were 3.23×109, higher than o,p′-DDE (1.02×109) and o,p′-DDD (2.01×109), indicating o,p′-DDT were more preferred to partition in soil compared with the metabolites. The KOA values were lower and PL values were higher for o,p′-DDE and o,p′-DDD, compared with their p,p′-isomeric counterparts, leading to a potential difference in behavior and fate of these isomers. The discrepancies among chemicals are obvious, which reflected in the increasing KOA and decreasing PL values in order of α-HCH, γ-HCH, β-HCH, δ-HCH, o,p′-DDE, p,p′-DDE, o,p′-DDD, o,p′-DDT, p,p′-DDD. For each compound, the LogKOA decreased linearly with reciprocal absolute temperature, while LogPL had a significant positive correlation with the inverse absolute temperature. The present study suggested that the method of gas chromatographic retention time was appropriate to measure the KOA and PL of a number of OCPs.