A COMPARISON OF WATER SOLUBILITY ENHANCEMENTS OF ORGANIC SOLUTES BY AQUATIC HUMIC MATERIALS AND COMMERCIAL HUMIC ACIDS
A COMPARISON OF WATER SOLUBILITY ENHANCEMENTS OF ORGANIC SOLUTES BY AQUATIC HUMIC MATERIALS AND COMMERCIAL HUMIC ACIDS
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DOI：
10.1021/es00165a012
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发表时间：
1987-12-01
影响因子：
11.4
通讯作者：
MACCARTHY, P
中科院分区：
文献类型：
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作者：
CHIOU, CT;KILE, DE;MACCARTHY, P
用以下样品研究了溶解有机物对1,1-二（对氯苯）-2,2,2-三氯乙烷（p,p " -DDT）、2,4,5,2 ",5 " -五氯联苯（2,4,5,5 ",5 " -PCB）和2,4,4 " -三氯联苯（2,4,4 " -PCB）的水溶性增强作用：(1)来自美国佐治亚州苏万尼河和美国佛罗里达州Sopchoppy河的酸性水样；(2)美国路易斯安那州Calcasieu河中pH值接近中性的腐殖质提取物；(3)来自Aldrich Chemical Co.和Fluka-Tridom Chemical Corp.的商业腐植酸。利用水样和水生腐植酸提取物计算有机溶质在溶解有机碳基础上的分配系数（Kdoc），本研究和早期的研究表明，增强效果随水生腐植酸材料的分子组成而变化。然而，水和水生腐殖质样品的Kdoc值远低于用两种商业样品观测到的Kdoc值，约为4-20倍。鉴于这一发现，在以商用腐植酸的使用为基础来解释溶解有机物对有机可溶物溶解度增强的影响时应谨慎。
Water solubility enhancements of 1,1-bis(p-chlorophenyl)-2,2,2-trichloroethane (p,p''-DDT), 2,4,5,2'',5''-pentachlorobiphenyl (2,4,5,5'',5''-PCB), and 2,4,4''-trichlorobiphenyl (2,4,4''-PCB) by dissolved organic matter have been studied with the following samples: (1) acidic water samples from the Suwannee River, Georgia [USA], and the Sopchoppy River, Florida [USA]; (2) a humic extract of nearly neutral pH water from the Calcasieu River, Louisiana [USA]; (3) commercial humic acids from the Aldrich Chemical Co. and Fluka-Tridom Chemical Corp. The calculated partition coefficients on a dissolved organic carbon basis (Kdoc) for organic solutes with water samples and aquatic humic extracts this and earlier studies indicate that the enhancement effect varies with molecular composition of the aquatic humic materials. The Kdoc values with water and aquatic humic samples are, however, far less than the observed Kdoc values obtained with the two commercial samples, by factors of about 4-20. In view of this finding, one should be cautious in interpreting the effects of the dissolved organic matter on solubility enhancement of organic solubles on the basis of the use of commercial humic acids.