Peer-Reviewed Journal Details
Mandatory Fields
Xu, D,Chen, YF,Ding, SM,Sun, Q,Wang, Y,Zhang, CS
2013
September
Environmental Science & Technology
Diffusive Gradients in Thin Films Technique Equipped with a Mixed Binding Gel for Simultaneous Measurements of Dissolved Reactive Phosphorus and Dissolved Iron
Published
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Optional Fields
IN-SITU MEASUREMENT HYDROUS ZIRCONIUM-OXIDE HIGH-RESOLUTION NATURAL-WATERS AQUEOUS-SOLUTION SHALLOW LAKES SEDIMENTS DGT PHOSPHATE FERRIHYDRITE
47
10477
10484
Developing a technique to track the release of phosphorus (P) and iron (Fe) simultaneously in sediments would be very useful in deepening our understanding of the internal loading process of P coupled with Fe cycling in aquatic systems. In this study, a new technique was established to measure simultaneously the dissolved reactive P (DRP) and dissolved Fe primarily released from sediment solids based on the diffusive gradients in thin films (DGT) theory. A mixed binding gel (ZrO-Chelex gel) used for assembling DGT was developed for simultaneous uptake of DRP and dissolved Fe(II) using amorphous zirconium hydroxide (Zr-oxide) and Chelex-100 resin as binding agents. Simultaneous measurements of DRP and dissolved Fe(II) with the ZrO-Chelex DGT were validated in solution and were independent of solution pH and ionic strength in normal environments. The capacities of the ZrO-Chelex DGT for measurements of DRP and dissolved Fe(II) were 90 mu g P cm(-2) and 75 mu g Fe cm(-2), with the latter being greater than that (45 mu g Fe cm(-2)) observed with the Chelex-100 resin DGT commonly used in DGT measurements of metals. Microcosm experiments further confirmed the feasibility of the ZrO-Chelex DGT for simultaneous measurement of P and Fe in sediments, with a higher concentration of Fe being measured due to this method's higher capacity compared with the Chelex-100 resin DGT.
DOI 10.1021/es401822x
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