Bioavailability and solubility equilibria of heavy metals in soils | Dynamics of cadmium, lead and zinc

Gloria Egwu

ISBN 10: 3844382615 / ISBN 13: 9783844382617

Published by LAP LAMBERT Academic Publishing, 2011

About this Item

Bioavailability and solubility equilibria of heavy metals in soils | Dynamics of cadmium, lead and zinc | Gloria Egwu | Taschenbuch | 116 S. | Englisch | 2011 | LAP LAMBERT Academic Publishing | EAN 9783844382617 | Verantwortliche Person für die EU: BoD - Books on Demand, In de Tarpen 42, 22848 Norderstedt, info[at]bod[dot]de | Anbieter: preigu.

Seller Inventory # 106960547

Bibliographic Details

• Title: Bioavailability and solubility equilibria of heavy metals in soils | Dynamics of cadmium, lead and zinc
• Publisher: LAP LAMBERT Academic Publishing
• Publication Date: 2011
• Language: English
• ISBN 10: 3844382615
• ISBN 13: 9783844382617
• Binding: Taschenbuch
• Condition: Neu
• Dimensions: 220W x 150H x 7D millimeters 220 millimeters width by 150 millimeters height by 7 millimeters depth
• Weight: 191 grams
• Seller catalogs:
  • Bücher

About this title

Synopsis

Metal adsorption by garden soils as a function of soil solution pH, indicated increasing metal adsorption with pH. At pH >5.0 more Pb was adsorbed than Zn or Cd. Soluble Zn, Pb and Cd concentrations in soils after 600 hours of reactions decreased almost linearly with pH. This was attributed to increasing charge density of the soils and the hydrolysis of metal cations. At pH below 6.5, the likely control on Zn2+ activities in soil solution was Franklinite (ZnFe2O4), but between pH 7 and 9, Zn2+ activities in soil solution approached the solubility isotherm of Hopeite (Zn3(PO4)2. The log Pb2+ - pH activity isotherms indicated that at pH < 6, Pb2+ activities in soil solution were close to chloropyromorphite [Pb5(PO4)3Cl] solubility, but as pH increased from 6 to 8, the activities of Pb2+ approached the solubility isotherm of Cerrusite (PbCO3). The log Cd2+-pH activity isotherms indicated that below pH 6.8, Cd2+ activities were either in equilibrium with or slightly oversaturated to Cd3(PO4)2 solubility. The dominant inorganic Zn complex was ZnSO4o followed by ZnOH+, ZnCl+ and Zn(OH)2o in that order.

About the Author

Dr. (Mrs.)Gloria is a lecturer at the Federal College of Education, Zaria, Nigeria. She studied at Ahmadu Bello University, Nigeria where she obtained her first, second and doctorate degree. She has special interest in soil and environmental chemistry. She is happily married with children to Chief Pius Egwu.