【亚磷酸可能是磷在太湖生物地球化学循环中的重要介质】Chao Han † Jinju Geng †* Hongqiang Ren † Shixiang Gao † Xianchuan Xie ‡ and Xiaorong Wang † Phosphite in Sedimentary Interstitial Water of Lake Taihu a Large Eutrophic Shallow Lake in China. Environ. Sci. Technol. 2013 47 (11) pp 5679–5685

The seasonal occurrence and distribution of phosphite (HPO₃^2- P) in sedimentary interstitial water from Lake Taihu was monitored from 2011 to 2012 to better understand its possible link to P cycle in the eutrophic shallow lake. Phosphite concentrations ranged from < MDL to 14.32 ± 0.19 μg P-kg with a mean concentration of 1.58 ± 0.33 μg P-kg which accounts for 5.51% total soluble P (TSP_s) in surficial sediments (0–20 cm). Spatially the concentrations of sedimentary phosphite in the lake’s northern areas were relatively higher than those in the southern areas. Higher phosphite concentrations were always observed in seriously polluted sites. Generally phosphite in the deeper layers (20–40 cm and 40–60 cm) showed minor fluctuations compared to that in the surficial sediments which may be associated with the frequent exchange at the sediment–water interface. Phosphite concentrations in surficial or core sediments decreased as spring > autumn > summer > winter. Higher phosphite levels occurred in the areas with lower redox (Eh) higher P contents and particularly when metal bonded with P to form