Cadmium Adsorption by a Humic Acid
Even though there have been a number of studies on interaction between heavy metals and humic substances,however,investigations on the interaction between humic acid and cadmium have been few in calcareous conditions,if any.In this study,humic acid was extracted from commercial humic fertilizer.Adsorption of cadmium by humic acid was determined as a function of pH and different concentrations of background electrolyte.In all levels of pH (5.7; 8.6),cadmium adsorption by humic acid declined tremendously by increasing of concentration of background electrolyte.Cadmium adsorption by humic acid increased significantly from pH 5 to 8.6 in low,intermediate; high electrolyte concentrations.Adsorption was greatest at high pH and low electrolyte concentration.The data fit well the Langrnuir model at all pH and electrolyte concentration values.Maximum sorption capacity (BL) from Langrnuir equations indicated that data in pH =8.6 had the greatest Cd sorption capacity in all electrolyte concentrations (Ⅰ) (I=6,12; 25 mmol/L).It can be explained by increasing solubility of humic acid in high pHs.
Humic acid (HA) Cadmium (Cd) Adsorption Background electrolyte pH Langmiur
Sara Mola Ali Abasiyan Hassan Tofighi
Ph.D.student and associate professor,respectively,Department of soil science,University College of Agriculture and Natural Resources,University of Tehran,Karaj 31587-77871,Iran
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
370-372
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）