Evaluation of an Osmonics® spiral-wound cross-flow filtration system for sub-μm sampling of Cd, Cu and Ni in seawater
- 作者：Greenamoyer ; Jennifer M. ; Moran ; S. Bradley
- 关键词：filtration ; trace metal ; colloidal ; marine ; geochemistry
- 刊名：Marine Chemistry
- 出版年：1996
- 期刊代码：50_03044203
- 类别：env
- 出版时间：November, 1996
- 卷：55
- 期：1-2
- 页码：153-163
- 文件大小：820 K
摘要
A 1-kDa (1 kDa = 1000 daltons) Osmonics spiral-wound cross-flow filtration (CFF) membrane has been evaluated for sampling Cd, Cu and Ni in <1-kDa and >1-kDa fractions of prefiltered seawater. Size-fractionated samples were collected as part of a CFF intercomparison experiment (Buesseler et al., 1996-this issue) and in the Gulf of Maine. Mass-balance results averaged 93 ± 6%(Cd), 81 ± 19%(Cu), and 99 ± 18%(Ni) for the intercomparison experiment and 56 ± 17%(Cd), 119 ± 38%(Cu), and 91 ± 6%(Ni) for the Gulf of Maine samples. Differences in mass balance between these studies may be related, in part, to removal of sub-μm particles and associated trace metals during prefiltration. An Amicon CFF system showed higher (2-12 ×) colloidal concentrations for Cu and Ni compared to Filtron and Osmonics systems; all CFF systems showed similar Cd, Cu and Ni mass-balance results. A model based on particle impaction with a filter shows the potential for adsorption of sub-μm particles by a 1-kDa Osmonics CFF membrane and conventional (Nuclepore) filters.