利用向海自然保护区一苇塘培养的生物膜在不同 p H值条件下进行铅、镉的吸附 ,通过 Freundlich和 L angmuir等温吸附曲线描述生物膜吸附铅、镉的热力学过程 .实验结果表明 ,不同 p H条件下 ,铅、镉在湿地水环境中培养的生物膜吸附热力...利用向海自然保护区一苇塘培养的生物膜在不同 p H值条件下进行铅、镉的吸附 ,通过 Freundlich和 L angmuir等温吸附曲线描述生物膜吸附铅、镉的热力学过程 .实验结果表明 ,不同 p H条件下 ,铅、镉在湿地水环境中培养的生物膜吸附热力学数据均与 Freundlich和 Langmuir等温吸附曲线显著性相关 ( n=5,p<0 .0 1 ) ,生物膜吸附铅的能力比吸附镉的能力约大一个数量级 ,吸附溶液中的 p H值与铅、镉的最大吸附量呈正比 。展开更多
Adsorption of Cd and Pb to components of surface coatings developed in five natural waters(Jilin Province, China) was carried out. The result indicates that the content of Fe oxides on surface coatings is much higher ...Adsorption of Cd and Pb to components of surface coatings developed in five natural waters(Jilin Province, China) was carried out. The result indicates that the content of Fe oxides on surface coatings is much higher than that of Mn oxides. Langmuir isotherm is more suitable to describe the adsorption of Cd and Pb onto surface coatings. The maximum adsorption of Pb and Cd to surface coatings is directly proportional to the contents of Mn oxides and Fe oxides on surface coatings with significant correlation( n=5, α =0.01), respectively, and to the content of aluminum oxides with significant correlation (n=5, α =0.05), highlighting the relative importance of metal oxide fraction for Pb and Cd adsorption to the surface coatings developed in the five natural waters. The result agrees with that previously obtained by selective extraction technique for the relative importance of Fe and Mn oxides and organic materials in controlling Cd and Pb adsorption to surface coatings developed in Cayuga Lake(New York, USA)展开更多
Surface coatings developed in three lakes and a river in Jilin Province, P. R. China were used to study the role of the composition of natural surface coatings in controlling Pb adsorption. Extraction techniques were ...Surface coatings developed in three lakes and a river in Jilin Province, P. R. China were used to study the role of the composition of natural surface coatings in controlling Pb adsorption. Extraction techniques were used to remove one or more chemical components from surface coatings. Pb adsorption to the extracted and unextracted surface coatings was measured. The observed Pb adsorption to the extracted and unextracted surface coatings were analyzed using nonlinear least squares fitting(NLSF) to estimate the relative contribution of chemical components to the total Pb adsorption of surface coatings. In different waters, the contribution to Pb adsorption for each chemical component was different, but in all the waters studied here, metal oxides(Fe oxides and Mn oxides) contributed the most, with a relative small contribution of organic phase.展开更多
Surface coatings are mainly composed of metal oxides(iron oxides, manganese oxides and aluminum oxides etc .), organic materials and little associated minerals according to environmental chemistry. Analytical results ...Surface coatings are mainly composed of metal oxides(iron oxides, manganese oxides and aluminum oxides etc .), organic materials and little associated minerals according to environmental chemistry. Analytical results indicate that the composition of surface coatings developed in different natural waters differ significantly, with Fe and Al oxides being dominative in the surface coatings, while manganese oxides next to them. It was also found that the content of Fe oxides was much higher than that of Mn oxides. Moreover, there is a significant correlation relationship between contents of metal oxides, organic materials on the surface coatings and those in natural waters.展开更多
The distribution of Fe and Mn oxides in surface coatings developed in natural waters in Jilin province of China has been investigated. The results indicate that the amounts of iron oxides and manganese oxides differ s...The distribution of Fe and Mn oxides in surface coatings developed in natural waters in Jilin province of China has been investigated. The results indicate that the amounts of iron oxides and manganese oxides differ significantly with the former being much higher and there is a correlative relationship between contents of Fe and Mn oxides and depths at which surface coatings were collected. The same phenumenon was also observed between contents of Fe and Mn oxides and developing period of surface coatings.展开更多
文摘Adsorption of Cd and Pb to components of surface coatings developed in five natural waters(Jilin Province, China) was carried out. The result indicates that the content of Fe oxides on surface coatings is much higher than that of Mn oxides. Langmuir isotherm is more suitable to describe the adsorption of Cd and Pb onto surface coatings. The maximum adsorption of Pb and Cd to surface coatings is directly proportional to the contents of Mn oxides and Fe oxides on surface coatings with significant correlation( n=5, α =0.01), respectively, and to the content of aluminum oxides with significant correlation (n=5, α =0.05), highlighting the relative importance of metal oxide fraction for Pb and Cd adsorption to the surface coatings developed in the five natural waters. The result agrees with that previously obtained by selective extraction technique for the relative importance of Fe and Mn oxides and organic materials in controlling Cd and Pb adsorption to surface coatings developed in Cayuga Lake(New York, USA)
文摘Surface coatings developed in three lakes and a river in Jilin Province, P. R. China were used to study the role of the composition of natural surface coatings in controlling Pb adsorption. Extraction techniques were used to remove one or more chemical components from surface coatings. Pb adsorption to the extracted and unextracted surface coatings was measured. The observed Pb adsorption to the extracted and unextracted surface coatings were analyzed using nonlinear least squares fitting(NLSF) to estimate the relative contribution of chemical components to the total Pb adsorption of surface coatings. In different waters, the contribution to Pb adsorption for each chemical component was different, but in all the waters studied here, metal oxides(Fe oxides and Mn oxides) contributed the most, with a relative small contribution of organic phase.
文摘Surface coatings are mainly composed of metal oxides(iron oxides, manganese oxides and aluminum oxides etc .), organic materials and little associated minerals according to environmental chemistry. Analytical results indicate that the composition of surface coatings developed in different natural waters differ significantly, with Fe and Al oxides being dominative in the surface coatings, while manganese oxides next to them. It was also found that the content of Fe oxides was much higher than that of Mn oxides. Moreover, there is a significant correlation relationship between contents of metal oxides, organic materials on the surface coatings and those in natural waters.
文摘The distribution of Fe and Mn oxides in surface coatings developed in natural waters in Jilin province of China has been investigated. The results indicate that the amounts of iron oxides and manganese oxides differ significantly with the former being much higher and there is a correlative relationship between contents of Fe and Mn oxides and depths at which surface coatings were collected. The same phenumenon was also observed between contents of Fe and Mn oxides and developing period of surface coatings.
