Use of constrained DET probe for a high-resolution determination of metals and anions distribution in the sediment pore water
Use of constrained DET probe for a high-resolution determination of metals and anions distribution in the sediment pore water
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DOI：
10.1016/s0039-9140(01)00679-8
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发表时间：
2002-04-22
期刊：
影响因子：
6.1
通讯作者：
Wartel, M
中科院分区：
文献类型：
--
作者：
Docekalová, H;Clarisse, O;Wartel, M
填充琼脂糖凝胶的约束DET（薄膜扩散平衡）探针已成功用于高分辨率（nun）测量河口沉积物中金属和阴离子的深度剖面。测试琼脂糖凝胶的平衡时间和回收率。对于锰（10 mg l(-1)），水溶液和琼脂糖凝胶之间的平衡时间在 60 分钟后达到。在腐殖酸存在的情况下，时间延长了五倍。因此，对于现场应用，部署时间为 5-24 小时。即使不混合，随后将锰洗脱到硝酸中也可在不到 10 分钟内完成。对于与 10 mg l(-1) 离子（镉、铜和锰、溴化物、氯化物、硝酸盐和硫酸盐）溶液接触的琼脂糖凝胶，获得的回收率接近 100%。 DET 探针应用于测试实验室沉积物和 Authie（法国）河口的真实沉积物。为测试实验室沉积物建立了 19 种元素（Ag、As、Ba、Bi、Cd、Co、Cr、Cu、Fe、Mn、Mo、Ni、Pb、Sb、Se、Sr、Tl、V 和 Zn）和 4 种阴离子（溴离子、氯离子、硝酸根和硫酸根）的深度剖面。在真实沉积物中，使用凝胶探针测得的铁和锰的孔隙水浓度与通过传统方法（箱芯缺氧切片然后离心）获得的结果相当。 (C) 2002 Elsevier Science B.V. 保留所有权利。
The constrained DET (diffusive equilibrium in thin films) probe filled with agarose gel was successfully used for measuring depth profiles of metals and anions in estuarine sediments at high-resolution (nun). The agarose gel was tested for equilibration times and recoveries. For manganese (10 mg l(-1)), the equilibration time between an aqueous solution and the agarose gel was reached after 60 min. In the presence of humic acids it was five times longer. As a consequence, for field applications a deployment time of 5-24 h was applied. The subsequent elution of manganese into nitric acid was completed in less than 10 min even without mixing. For agarose gel in contact with solutions of 10 mg l(-1) ions (cadmium, copper and manganese, bromide, chloride, nitrate and sulfate), recoveries obtained were close to 100%. DET probes were applied in test laboratory sediment and in real sediment in the Authie (France) estuary. Depth profiles for 19 elements (Ag, As, Ba, Bi, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Sb, Se, Sr, Tl, V, and Zn) and four anions (bromide, chloride, nitrate and sulfate) were established for the test laboratory sediment. In the real sediment, the pore water concentrations of iron and manganese using gel probes were comparable with those obtained by a conventional method (box core-anoxic slicing followed by centrifugation). (C) 2002 Elsevier Science B.V. All rights reserved.