Dissolved organic carbon as the main carrier of phthalic acid esters in municipal landfill leachates

被引:32
作者
Bauer, MJ
Herrmann, R
机构
[1] Univ Bayreuth, Dept Hydrol, D-95440 Bayreuth, Germany
[2] Univ Bayreuth, Chair Hydrol, D-95440 Bayreuth, Germany
关键词
phthalates; facilitated transport; solubilization; DOC; suspended particles; domestic waste dumps;
D O I
10.1177/0734242X9801600507
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Various plastic materials have been disposed of in municipal waste dumps. Thus, phthalic acid esters (PAE) which are used as plasticizers can also be found in the leachates of those land fills. A number of leachates were divided into dissolved and particulate phases to determine the percentage of PAE being transported in the solution. The solutions were found to be contaminated with bis-(2-ethylhexyl) phthalate (DEHP) up to 235.9 mu g 1(-1), and dibutyl phthalate (DBP) at a maximum of 62.7 mu g 1(-1). Suspended particles contained maximum concentrations of 167.6 mu g g(-1) and 126.0 mu g g(-1) for DEHP and DBP, respectively. Approximately 85% of the total PAE and a mean of 87% of the hydrophobic DEHP was detected in the dissolved phase. The amounts of PAE, especially of DEHP, in solution was correlated to dissolved organic carbon (DOC) concentrations. Moreover, there was a negative correlation of the contents of suspended solids with PAE in dissolved form. The results indicate that in municipal landfill leachates the DOC is much more important as a transport vehicle for hydrophobic phthalate esters than the suspended particles present. Consequently, there may be a much higher mobilising potential for codisposed environmental chemicals than supposed so far.
引用
收藏
页码:446 / 454
页数:9
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