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首页> 外文期刊>Environmental toxicology and chemistry >SEDIMENT SORPTION COEFFICIENT MEASUREMENTS FOR FOUR PHTHALATE ESTERS: EXPERIMENTAL RESULTS AND MODEL THEORY
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SEDIMENT SORPTION COEFFICIENT MEASUREMENTS FOR FOUR PHTHALATE ESTERS: EXPERIMENTAL RESULTS AND MODEL THEORY

机译：四种邻苯二甲酸酯的沉积物吸收系数的测量：实验结果和模型理论

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Sediment partition coefficients were measured for four commercial phthalate esters: dihexyl phthalate (DHP), di(2-ethylhexyl) phthalate (DEHP), diisodecyl phthalate (DIDP), and ditridecyl phthalate (DTDP). The experimental procedure was based on the U.S. Environmental Protection Agency (EPA) Test Guideline 796.2750, "Sediment and Soil Adsorption Isotherm." Three sediments were used: EPA 8 (0.15% organic carbon), EPA 18 (0.66% organic carbon), and EPA 21 (1.88% organic carbon). The Freundlich equation was used to calculate organic carbon-normalized sediment/water partition coefficients (K_(oc)), which averaged 5.26 x 10~4 ± 4.54 x 10~3; 4.82 x 10~5 ± 3.52 X 10~5; 2.86 X 10~5 ± 2.74 X 10~5; and 1.82 x 10~6 ± 1.05 x 10~6 for DHP, DEHP, DIDP, and DTDP, respectively. In general, these K_(oc) values did not correlate well to either sediment or chemical properties. This lack of correlation suggested that the measured K_(oc) values are suppressed, potentially as a function of experimental conditions. On the basis of these data, it was decided to investigate the dependence of K_(oc) on sediment solids concentration and dissolved organic carbon. Analysis of these and earlier reported partition coefficient data indicated that measured K_(oc) values for phthalate esters obtained in shake-flask experiments exhibited an inverse dependence on solids concentration. These results were consistent with partitioning models that are discussed. Depending on compound hydropho-bicity, the particle-corrected K_(oc) values were from one to three orders of magnitude higher than the measured K_(oc) values. Therefore, if partition coefficient values obtained by using Test Guideline 796.2750 or similar shake-flask procedures are not corrected for solids effect, the estimates of the sediment pore-water concentration of the chemical is likely to be overestimated.
机译：测量了四种商用邻苯二甲酸酯的沉积物分配系数：邻苯二甲酸二己酯（DHP），邻苯二甲酸二（2-乙基己基）酯（DEHP），邻苯二甲酸二异癸基酯（DIDP）和邻苯二甲酸二十三烷基酯（DTDP）。实验程序基于美国环境保护署（EPA）测试指南796.2750，“沉积物和土壤吸附等温线”。使用了三种沉积物：EPA 8（有机碳含量为0.15％），EPA 18（有机碳含量为0.66％）和EPA 21（有机碳含量为1.88％）。 Freundlich方程用于计算有机碳归一化沉积物/水分配系数（K_（oc）），平均值为5.26 x 10〜4±4.54 x 10〜3； 4.82 x 10〜5±3.52 X 10〜5; 2.86 X 10〜5±2.74 X 10〜5;对于DHP，DEHP，DIDP和DTDP，分别为1.82 x 10〜6±1.05 x 10〜6。通常，这些K_（oc）值与沉积物或化学性质都没有很好的相关性。这种缺乏相关性表明，测得的K_（oc）值受到抑制，可能是实验条件的函数。根据这些数据，决定研究K_（oc）对沉积物固体浓度和溶解有机碳的依赖性。对这些和先前报道的分配系数数据的分析表明，在摇瓶实验中获得的邻苯二甲酸酯的K_（oc）值测量值与固体浓度呈反比关系。这些结果与讨论的分区模型一致。根据化合物的疏水性，颗粒校正后的K_（oc）值比测得的K_（oc）值高1至3个数量级。因此，如果未通过测试指南796.2750或类似的摇瓶程序获得的分配系数值对固体影响进行校正，则该化学品的沉积物孔隙水浓度估计值可能会被高估。

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