Estimating Dissolved Organic Carbon Partition Coefficients for Nonionic Organic Chemicals

详细信息    查看全文

• 作者：Lawrence P. Burkhard
• 刊名：Environmental Science & Technology
• 出版年：2000
• 出版时间：November 15, 2000
• 年：2000
• 卷：34
• 期：22
• 页码：4663 - 4668
• 全文大小：81K
• 年卷期：v.34,no.22(November 15, 2000)
• ISSN：1520-5851

文摘

A literature search was performed for dissolved organiccarbon/water partition coefficients for nonionic organicchemicals (K_DOC), and K_DOC data were taken from more than70 references. The K_DOC data were evaluated as afunction of the 1-octanol/water partition coefficients(K_OW). A predictive relationship of K_DOC = 0.08K_OW with95% confidence limits of a factor of 20 in either directionwas developed using K_DOC data based upon naturallyoccurring dissolved organic carbon. Inclusion of K_DOC datafor Aldrich humic acid, a reagent-grade organic carbon,resulted in a slightly different predictive relationship of K_DOC= 0.11K_OW with 95% confidence limits of a factor of 14in either direction. The large uncertainties in theserelationships are, in part, caused by the variability instructure and composition of dissolved organic carbon(DOC) in sediments, soils, and surface waters. This variabilityis not accounted for by the hydrophobicity parameter.For individual chemicals, ranges in K_DOC values approaching2 orders of magnitude were observed among investigationsusing Aldrich humic acid as the DOC. These largeranges of K_DOC values suggest that measurement techniquesare also, in part, responsible for the large uncertaintiesin these relationships.