Isolation of marine sediment colloids and associated polychlorinated biphenyls: An evaluation of ultrafiltration and reverse-phase chromatography

被引:27
作者
Burgess, RM
Mckinney, RA
Brown, WA
Quinn, JG
机构
[1] UNIV RHODE ISL, GRAD SCH OCEANOG, NARRAGANSETT, RI 02882 USA
[2] SCI APPLICAT INT CORP, NARRAGANSETT, RI 02882 USA
关键词
D O I
10.1021/es950620d
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Environmental colloids are suspected of having significant effects on nonpolar organic contaminant geochemistry, transport, and bioavailability. However, environmental data on colloid-contaminant interactions is limited because isolating colloids from the dissolved and particulate phases is problematic. In this study, two practical methods using ultrafiltration and reverse-phase chromatography were evaluated for isolating environmentally contaminated marine sediment interstitial water colloids and associated PCBs. In assessing each method, ultrafiltration demonstrated extensive sorption of radiolabeled nonpolar compounds (> 90%) and a re-occurring breakthrough phenomena, both of which compromise the method for accurately assessing colloid-PCB interactions. Conversely, C-18 reverse-phase chromatography, performed using laboratory-packed columns, generated reproducible organic carbon-normalized colloidal partitioning coefficients (K-coc) that agreed with literature and theoretical considerations. Evaluations of sample flow rate and prefiltration size along with potential for C-18 bed saturation indicated that these parameters have only a minor (e.g., less than a factor of 2) effect on the calculated contaminant distribution coefficients. Of the two methods evaluated, reverse-phase chromatography was the most promising for quantifying environmental colloid-PCB interactions.
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页码:1923 / 1932
页数:10
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