Diffusive Gradients in Thin Films Technique Equipped with a Mixed Binding Gel for Simultaneous Measurements of Dissolved Reactive Phosphorus and Dissolved Iron

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 simul...

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Bibliographic Details
Published in:Environmental science & technology 2013-09, Vol.47 (18), p.10477-10484
Main Authors: Xu, Di, Chen, Yifei, Ding, Shiming, Sun, Qin, Wang, Yan, Zhang, Chaosheng
Format: Article
Language:English
Subjects:
Analysis methods
Applied sciences
Aquatic ecology
Exact sciences and technology
Gels
Geologic Sediments - chemistry
Iron
Iron - analysis
Iron - chemistry
Phosphorus
Phosphorus - analysis
Phosphorus - chemistry
Pollution
Resins, Synthetic - chemistry
Sediments
Soil and sediments pollution
Thin films
Zirconium - chemistry
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Summary: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 μg P cm–2 and 75 μg Fe cm–2, with the latter being greater than that (45 μg 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.
ISSN:0013-936X
1520-5851
DOI:10.1021/es401822x