中文摘要：

通过扫描电子显微镜、能量分析谱、红外光谱和悬浮酵母菌的动电电位等分析手段，研究了悬浮酵母菌对Hg（Ⅱ）的吸附机理。由扫描电镜图像及能量分析谱可以看出，悬浮酵母菌吸附Hg（Ⅱ）后形态发生变化，悬浮酵母菌对Hg（Ⅱ）的吸附存在离子交换吸附；动电电位及pH曲线分析表明，悬浮酵母菌的零电点为pH=3．7，pH值是影响吸附效果的重要因素，溶液pH值为4．33时，吸附效果最好，去除率为99．95％；溶液pH〈4．0时，静电作用为主要的吸附机理；从吸附等温线可以得出，在溶液中Hg（Ⅱ）的初始质量浓度为601．8mg／L，菌质量浓度为20g／T．时，吸附达到饱和，此时的负载量为1024mg／g；红外光潜分析表明，悬浮酵母菌剥Hg（Ⅱ）的主要吸附位点为-OH、-NH，C=0、P=0和S=0。

英文摘要：

The present paper is to introduce the authors＇ research into the mechanism of Hg（Ⅱ） biosorption by saccharomyces eerevisiae while applying modern analysis means, such as SME, electron spectrum, FT-IR analysis, and zeta potential apparatus. The contrasted resuhs of SME and electron spectrum show that the form of saccharomyces cerevisiae has changed as the result of the biosorption on Hg^2＋ . The other findings of our research can be stated as follows. （l） An obvious hydronium commutation in the course of saccharomyces cerevisiae biosorption on Hg^2＋ ; （2） The isoelectric point of saceharomyces cerevisiae proves at pH = 3.7 as the result of zeta potential and pH curve＇s analysis; （3） As an important affecting factor, the pH value is 4.33 ; （4） When the value of pH is under 4.33, i.e. on the ideal adsorbing condition, the removal rate can reach 99.95%, with the biosorption of Hg（ Ⅱ ） by saccharomyces cerevisiae being the main static biosorption. From the absorbing isotherm, it can be found that, when the initial concentration of Hg solution is 601.8 mg/L, the concentration of the germ will be 20 g/L, with the biosorption reaching saturation, and the loading quantity will be 10.24 mg/g. Thus, the FF-IR analyses indicate that the mainly adsorbing positions of saccharomyces cerevisiae to Hg（ Ⅱ ） are --OH, --NH2, C = O, P = O, and S = O.