Abstract:The response of phosphorus fraction in the sediments from Lake Nanhu in Wuhan to the input of sulfate was investigated based on the indoor simulation experiments. It showed that sulfate input improved the mobility of phosphorus in sediments, resulting in the increase of concentrations of total phosphorus (TP) and soluble reactive phosphorus (SRP) in the overlying water. Higher external sulfate concentration experienced greater increase of phosphorus contents in the overlying water. The contents of acid volatile sulfur (AVS) in the sediments initially increased and then fell, while the chromium reducible sulfur kept the trend of increase. It indicated that the AVS in the sediments was produced after the sulfate penetrated to the sediments, followed by the transformation of AVS to chromium reducible sulfur. pH increased and Eh decreased due to the reduction of sulfate in the sediments. The effect of sulfate input was much different for the different fractions of phosphorus in the sediments. The contents of Ca2-P increased with the increase of sulfate concentration. The Fe-P with the highest content in the sediments (51.4%~56.6 % of total phosphorus), was significantly influenced by the sulfate (P<0.01). It released from sediments to overlying water, and the soluble iron in the overlying water had positive correlation with the TP and SRP. The O-Fe-P was also affected by the external sulfate and showed release mobility from the sediments.
袁探, 华玉妹, 朱端卫, 丁敏, 蔡建波. 外源硫酸盐对武汉南湖表层沉积物磷形态的作用[J]. 中国环境科学, 2012, 32(4): 666-673.
YUAN Tan, HUA Yu-Mei, ZHU Duan-Wei, DING Min, CAI Jian-Bo. Effect of external sulfate on fraction of phosphorus in the surface sediment from Lake Nanhu in Wuhan. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(4): 666-673.