天然水体生物膜中汞的蓄积因素及汞的存在形态

Effect Factors for Mercury Accumulation to Natural Surface Coatings and Analysis Its Forms of Occurrence

为了探讨生物膜对汞的蓄积因素，研究了不同深度、不同培养时间、不同季节等条件对黄浦江生物膜中汞元素含量的影响，并对其存在形态进行分析．结果表明，生物膜中有机质含量较高（7．5％～14．5％）；生长时间，水深，季节都是影响生物膜中汞元素蓄积的重要因素；光照越强，温度越高，生长时间越长，生物膜中汞元素含量越高；生物膜中残渣态（41．98％）和有机质结合态（27．89％）的汞含量比较高，碳酸盐结合态（10．17％）和铁锰氧化物结合态（5．33％）的汞含量相对较少．

In order to probe to the factors for mercury accumulation to natural surface coating, we study the concentration of mercury in Huangpu River surface coatings developed for different depth, different grown days and different seasons and analysis mercury forms of occurrence. The result show the organic matter in biofilm is much high（7.5 % - 14.5 % ）. Growth time, depth and seasons are all important factors for mercury accumulation to surface coating. Illumination and temperature was stronger and the growth day was longer, The concentration of mercury in biofilm was higher. The mercury forms of occurrence in surface coating were mainly residual matter bound mercury（41.98 % ） and organic acids bound mercury（27.89 % ）. The percentage of carbonate bound mercury （ 10.17 % ） and ion exchangeable mercury（5.33 % ） was little.