Kinetics of cadmium desorption from some soils of Iran
View/ Open
Author(s)
Esfandbod, Maryam
Adhami, Ebrahim
Rashti, Mehran Rezaei
Esfandbod, Malahat
Year published
2010
Metadata
Show full item recordAbstract
Cadmium (Cd) is highly toxic and therefore represents a potential threat to the environment and human health. To improve predictions of the toxicity and threat from Cd contaminated soil, knowledge of timedependent desorption behavior of these soils is crucial. Kinetics of Cd desorption from 15 Cd-spiked surface soil samples (0-30 cm) from the northern part of Iran with a wide range of physical and chemical properties, were studied. Treatments consisted of two levels of Cd (15 and 30 mg/kg as CdCl2) with two replications. Samples were incubated under 20% w/w moisture content and 25ᰃ. After 3 and 6 weeks, Cd desorption pattern ...
View more >Cadmium (Cd) is highly toxic and therefore represents a potential threat to the environment and human health. To improve predictions of the toxicity and threat from Cd contaminated soil, knowledge of timedependent desorption behavior of these soils is crucial. Kinetics of Cd desorption from 15 Cd-spiked surface soil samples (0-30 cm) from the northern part of Iran with a wide range of physical and chemical properties, were studied. Treatments consisted of two levels of Cd (15 and 30 mg/kg as CdCl2) with two replications. Samples were incubated under 20% w/w moisture content and 25ᰃ. After 3 and 6 weeks, Cd desorption pattern was investigated by DTPA (Diethylne-Triamine-Pentaacetic-Acid) extraction with shaking times from 30 to 960 min. Results showed that two-constant-rate, parabolic-diffusion and simple Elovich equations were the best fitted equations among five kinetic models used. The coefficients of kinetic equations had significant correlation with each other. Stepwise multiple regression equations indicated that pH and CEC (cation exchange capacity) were the most important soil characteristics for predicting the rate constants of the kinetic models.
View less >
View more >Cadmium (Cd) is highly toxic and therefore represents a potential threat to the environment and human health. To improve predictions of the toxicity and threat from Cd contaminated soil, knowledge of timedependent desorption behavior of these soils is crucial. Kinetics of Cd desorption from 15 Cd-spiked surface soil samples (0-30 cm) from the northern part of Iran with a wide range of physical and chemical properties, were studied. Treatments consisted of two levels of Cd (15 and 30 mg/kg as CdCl2) with two replications. Samples were incubated under 20% w/w moisture content and 25ᰃ. After 3 and 6 weeks, Cd desorption pattern was investigated by DTPA (Diethylne-Triamine-Pentaacetic-Acid) extraction with shaking times from 30 to 960 min. Results showed that two-constant-rate, parabolic-diffusion and simple Elovich equations were the best fitted equations among five kinetic models used. The coefficients of kinetic equations had significant correlation with each other. Stepwise multiple regression equations indicated that pH and CEC (cation exchange capacity) were the most important soil characteristics for predicting the rate constants of the kinetic models.
View less >
Conference Title
19th World Congress of Soil Science: Symposium: Soil and Human Culture
Publisher URI
Copyright Statement
© 2010 Australian Soil Science Society. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the conference's website for access to the definitive, published version.
Subject
Soil Chemistry (excl. Carbon Sequestration Science)