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首页> 外文期刊>Environmental Science & Technology >Trace metal speciation in brackish water using diffusive gradients in thin films and ultrafiltration: Comparison of techniques
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Trace metal speciation in brackish water using diffusive gradients in thin films and ultrafiltration: Comparison of techniques

机译：使用薄膜中的扩散梯度和超滤在微咸水中痕量金属形态：技术比较

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Diffusive gradients in thin films ( DGT) and ultrafiltration were used to measure trace metal concentrations in the Baltic Sea. The results provide the first comparison of these two fundamentally different speciation methods for trace metals. Cd, Cu, Mn, Ni, and Zn were measured at two sites with different total trace metal concentrations. DGT units prepared with APA-gel as diffusive layer and Chelex 100 resin as binding agent were used throughout the study. The ultrafiltration was performed with Millipore Prep/Scale modules with cutoffs of 1 and 10 kDa. Concentration levels of Mn, Zn, and Cd measured by DGT agreed with the concentrations measured in 1 kDa ultrafiltered samples. For Cu and Ni the ultrafiltered concentrations exceeded the DGT-labile concentrations. The ability of DGT to preconcentrate metals was found to be an analytical advantage compared with ultrafiltration. DGT appears to be a good alternative to 1 kDa ultrafiltration for measurement of truly dissolved Mn, Cd, and Zn in the Baltic Sea.
机译：薄膜中的扩散梯度（DGT）和超滤用于测量波罗的海中的痕量金属浓度。结果提供了这两种根本不同的痕量金属形态分析方法的首次比较。在总痕量金属浓度不同的两个位置测量了Cd，Cu，Mn，Ni和Zn。在整个研究过程中，均使用以APA凝胶作为扩散层和Chelex 100树脂作为粘合剂制备的DGT单元。用截止值为1和10 kDa的Millipore Prep / Scale模块进行超滤。用DGT测量的Mn，Zn和Cd浓度与1 kDa超滤样品中测得的浓度一致。对于铜和镍，超滤浓度超过了DGT不稳定浓度。与超滤相比，发现DGT预浓缩金属的能力具有分析优势。对于测量波罗的海中真正溶解的Mn，Cd和Zn，DGT似乎是1 kDa超滤的良好替代方法。

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