To further support implementation of monitoring by passive sampling, robust sampler–water partition coefficients (K_pw) are required to transfer data from passive sampler into aqueous phase concentrations. In this work silicone–water partition coefficients were determined for ∼80 hydrophobic organic contaminants using the cosolvent method. Partition coefficients (K_pm) were measured in pure water and water-methanol mixtures up to a methanol mole fraction of 0.3 (50% v/v). Subsequently, logK_pw in pure water was determined as the intercept of linear regression of the logK_pm with the corresponding methanol mole fractions. LogK_pw were determined for phthalates, musks, organo phosphorus flame-retardants, chlorobenzenes, pesticides, some PCBs and a number of miscellaneous compounds. LogK_pw Within compounds The median standard error and 95% confidence interval of the measured logK_pw was 0.06 and 0.13, respectively. The overall relationship between K_pw and K_ow seems insufficient to predict K_pw for unknown compounds. Prediction may work within a group of compounds with similar nature, e.g. homologues but HCH isomers having the same K_ow exhibit K_pw ranging over an order of magnitude. Long alkyl-chain phthalates and tris(2-ethylhexyl) phosphate; all having a molecular volume >400 ų, deviated the most from the K_pw–K_ow relationship.

为了进一步支持通过被动采样进行监控，需要强大的采样器-水分配系数（K _pw）才能将数据从被动采样器转换为水相浓度。在这项工作中，使用助溶剂方法确定了约80种疏水性有机污染物的硅水分配系数。在纯水和水-甲醇混合物中测量的分配系数（K _pm）高达0.3（50％v / v）的甲醇摩尔分数。随后，将纯水中的log K _pw确定为log K _pm与相应的甲醇摩尔分数的线性回归的截距。日志K _pw对邻苯二甲酸盐，麝香，有机磷阻燃剂，氯苯，农药，某些多氯联苯和许多其他化合物进行了测定。化合物内的Log K _pw测得的log K _pw的中位标准误差和95％置信区间分别为0.06和0.13。K _pw和K _ow之间的整体关系似乎不足以预测未知化合物的K _pw。预测可以一组具有相同的具有类似性质的化合物，例如同系物但HCH异构体的内工作ķ_流展览ķ _PW范围超过一个数量级。长烷基链邻苯二甲酸酯和磷酸三（2-乙基己基）酯；所有具有分子体积> 400埃³，偏离从最ķ _PW - ķ_流关系。