Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 45, Issue 22, Pages 9680-9686Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es202785p
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Funding
- CAS [KZCX2-YW-JS304]
- National Scientific Foundation of China [40730528, 40871220]
- Nanjing Institute of Geography and Limnology, CAS [NIGLAS2010KXJ01]
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Dissolved reactive phosphorus (DRP) is the most available P form in sediments and often directly controls phytoplankton blooms in aquatic systems. In this study, a novel procedure was developed for two-dimensional (2D) measurement of DRP in sediments at a spatial resolution of 0.45 mm using the diffusive gradients in thin films (DGT) technique with a revised high-capacity binding phase (Zr oxide gel). This procedure involves DGT uptake of P in sediments, 2D slicing of the binding gel on a 0.45 x 0.45-mm grid system, elution of P from each gel square with 1 MNaOH, and microcolorimetric determination of DRP in each eluted solution using 384-microwell plates. Measurements of DRP via this procedure were tested in homogeneous solutions and sediments and produced an acceptable error (<20% relative standard deviation) for the analysis once the accumulated mass of P in each gel square reached 1.2 mu g cm(-2). This method was successfully applied to produce 2D images of the DRP distribution in sediments with and without the influence of tubificid worm bioturbation, revealing a much more pronounced and localized impact from tubificid worms than that found using a one-dimensional measurement of pore water DRP concentrations at 1-cm resolution.
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