title: Interaction of Cd and citric acid, EDTA in red soil.
abstract: Adsorption and desorption process of cadmium in red soil (Ferrisols) as well as the influence by media's pH were investigated in detail with and without citric acid and EDTA. Experimental results clearly showed that Cd adsorption in red soil was affected significantly by the coexisted organic chemicals. In the presence of citric acid and EDTA, Cd adsorption in red soil increased with pH in acid media but decreased in high pH one. Further studies placed stress on the adsorbed Cd in red soil which was found to be existed mainly as exchangeable one at pH < 5.5, and desorption rate by 0.10 mol/L NaNO3 gave a peak-shaped curve due to the difference of specifically and nonspecifically adsorbed Cd with pH's change.
authors.affiliation: Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: D M
authors.initials: DM
authors.lastname: Zhou
authors.forename: S Q
authors.initials: SQ
authors.lastname: Wang
authors.forename: H M
authors.initials: HM
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000032:analysis; D002104:Cadmium / Q000737:chemistry*; D002412:Cations / Q000032:analysis; D019343:Citric Acid / Q000737:chemistry*; D004347:Drug Interactions; D004492:Edetic Acid / Q000737:chemistry*; D005290:Ferric Compounds / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D017895:Manganese Compounds / Q000032:analysis; D009566:Nitrates / Q000494:pharmacology; D010087:Oxides / Q000032:analysis; D012822:Silicon Dioxide / Q000032:analysis; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants
chemical_list: D002412:Cations; D005290:Ferric Compounds; D017895:Manganese Compounds; D009566:Nitrates; D010087:Oxides; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; C000499:ferric oxide; D019343:Citric Acid; D012822:Silicon Dioxide; C031618:sodium nitrate; D004492:Edetic Acid; D000537:Aluminum Oxide; C016552:manganese dioxide