淮南潘一矿塌陷水域沉积物中磷的赋存和迁移转化特征

采用改进的Pesnner分级提取方法,选取淮南潘一矿杨庄塌陷水域为研究对象,对其沉积物磷的剖面赋存形态进行分析,并结合磷的形态组成、有机质(OM)、总氮(TN)和铁锰氧化物等分布特征,研究了塌陷水域沉积物中磷的迁移转化特征.结果表明,在淹水农业耕作层上,湖泊沉积相累积明显,自表层而下,各形态磷含量均呈逐渐减少的趋势,总磷(TP)在各层次均值为204.9~343.7mg/kg,其中以无机磷(IP)为主,其含量为163.9~257.2mg/kg,占TP比例达73.3%~81.5%.NaOH-P(85.0~100.1mg/kg,28.6%~41.3%)和HCl-P (63.6~95.9mg/kg,27.4%~30.9%)所占比例较大.根据相关性结果分析,部分HCl-P和有机磷(OP)有向NaOH-P转化的趋势.

Phosphorus fractions and migration in the sediments of a subsided water area in Panyi coal mine of Huainan

Phosphorus content and fractions in the sediments of one water area from subsided land were analyzed using the modified Pesnner’s extraction method. The migration processes of phosphorus from the submerged agricultural soils were further pursued through the relationship between phosphorus and organic matters (OM), total nitrogen (TN), and Fe oxides of free and amorphous forms. There was an obvious surface layer of lake sediments phase, which covered on the surface of submerged soils. Contents of various phosphorus species were decreasing with the deeper layers of the sediments. TP had an average content of 204.9mg/kg in the bottom layer, which increased to 343.7mg/kg in the surface layers. Inorganic phosphorus (IP) was the main forms of TP, varied at a range of 163.9~257.2mg/kg with a proportion of 73.3%~81.5% to TP. The phosphorus combined with hydrous oxides (NaOH-P) and calcium compounds (HCl-P) ranges were 85.0~100.1mg/kg and 63.6~95.9mg/kg, taking the 28.6%~41.3% and 27.4%~30.9% of TP, respectively. Parts of HCl-P or organic phosphorus (OP) was probably transformed to NaOH-P.