摘要
为研究胶州湾北部沉积物汞吸附的特征,于2012年5月中旬在位于胶州湾北部的红岛贝类养殖滩涂采集沉积物样品,选取两种理化性质差异较大的沉积物。采用F732-V型冷原子吸收测汞仪对沉积物中的总汞质量比进行测定。结果表明,在两种汞质量浓度条件下,有机质质量比和CEC值较高的沉积物最大汞吸附量与有机质质量比和CEC值较低的沉积物最大汞吸附量的比值在106%-143%。用Langmuir、Freundlich、Temkin等温吸附方程对试验数据进行拟合,其中Freundlich（r=0.917-0.945）、Temkin（r=0.909-0.932）等温吸附方程的拟合程度较高。pH值对两种沉积物的汞吸附量有明显影响,当pH值约为7时,两种沉积物的汞吸附量均最大;pH〈7时,两种沉积物的汞吸附量随pH值增加而递增;pH〉7时,两种沉积物的汞吸附量随pH值增加而减小。
The essay attempts to present a report of its study of mercury adsorption properties on the sediments in the north area of Jiaozhou Bay. It has been found that there are two kinds of sediments with different physical and chemical absorptive behavior, the samples were collected from the shellfish aquaculture tidal flats in the Red Island in the said bay in the middle may, 2012, which we have chosen as study samples for study. They were then been sent fm testing and experiments for their mercury content inside with a Model F732 - V cold vapor atomic absorption spectrophotometer. The results of our experiments with the mercury adsorption kinetics prove that the ratio of the maximal adsorptive power of the sediment samples with higher content of organic substance and CEC with that of the sediment samples with lower ratio of organic matter and CEC stands from 106% to 143 %, under the condition of lower mercury content and higher mercury concentration in the sediment samples. At the same time, we have found that as a kind of competitive ions, SO2- had little impact on the mercury adsorption in the sediments, due to its lower content in the tested sediments. On the other hand, since the initial mercury concentrations in the solution is an important factor that may affect the mercury adsorption in the sediments, that is to say, the ：aaercury adsorptive power tends to increase with the increase of the initial mer- cury concentrations in the solution. In the isothermal adsorption experiments, the fitting results show that the isotherm equation of the Freundlich （ r = 0.917 - 0.945） and Temkin （ r = 0.909 - 0.932） enjoy a higher fitting behavior for the isothermal fitting tendency to the two sediment samples. What＇s more, pH value also serws as an im： portant factor that may affect the mercury adsorption. The maximum mercury adsorption power turns to appear at the point when pH value is 7 for the both sediment samples. And it is at this moment that the mercury adsorption tends to increase with the increase of the pH value （that is pH 〈 7）. Conversely, the mercury adsorptive power is likely to decrease with the increase of the pH value on the condition when pH〉 7.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第5期191-195,共5页
Journal of Safety and Environment
基金
国家自然科学基金项目(41101094)
关键词
环境学
吸附
沉积物
汞
北部胶州湾
environmentalology
adsorption
sediments
mercury
north of the Jiaozhou Bay
