التفاصيل البيبلوغرافية
| العنوان: |
Diffusive Gradients in Thin Films Technique Equipped with a Mixed Binding Gel for Simultaneous Measurements of Dissolved Reactive Phosphorus and Dissolved Iron. |
| المؤلفون: |
Di Xu1, Yifei Chen2, Shiming Ding1 smding@niglas.ac.cn, Qin Sun2, Yan Wang1, Chaosheng Zhang3 |
| المصدر: |
Environmental Science & Technology. 9/17/2013, Vol. 47 Issue 18, p10477-10484. 8p. |
| مصطلحات موضوعية: |
THIN films, COLLOIDS, PHOSPHORUS, IRON, SEDIMENTS, SOLUTION (Chemistry), HYDROGEN-ion concentration, BINDING agents |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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