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However, some environmental conditions which will affect the results and conclusions are omitted in this experiment. For example, dissolve oxygen at sediment-water interface will affect the content of ferric and ferrous which further will affect the orthophosphate concentration in overlying water, since biological activities will affect DO at water-sediment interface and further affect P fraction concentration. In addition, SO4 in sediment and overlying water will play key role in P mineralization and also will affect the experimental results. These parameters should be measured during the experiment and the effect on the results should be addressed in discussion section. For their findings, the authors seem fail to give a broader meaning.

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