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- Title
Estimation and sensitivity analysis on cadmium desorption rates in soils under influence of cadmium complex sorption.
- Authors
Lin, Zhongbing; Huang, Shuang; Zou, Xingying
- Abstract
Cadmium (Cd) desorption rate is important in studying Cd leaching and phytoextraction in soils. This study estimated Cd desorption rates in soils and analyzed the sensitivity to soil properties under the influence of Cd complex sorption. The concentrations of Cd2+, Cd complex, and total Cd in 27 soils leached by DTPA and EDTA were analyzed, respectively. Kinetic models were used to fit desorption data to obtain the desorption rates of total Cd and Cd2+, respectively. The sensitivity of desorption rates to soil properties were analyzed. Results showed that, if omitting sorption of Cd complex, apparent desorption rates of total Cd varied between 1.9 and 9.2 × 10–2 min−1, and if considering sorption of Cd complex, desorption rates of Cd2+ varied between − 1.6 and 13.9 × 10–2 min−1. The relative differences between desorption rates of Cd2+ and apparent desorption rates varied between − 180% and 346%. Under maximum sorption level of Cd complex, there were about 62% DTPA experiments whose Cd2+ desorption rates were higher, whereas about 75% EDTA experiments whose Cd2+ desorption rates were lower, compared with the apparent desorption rates. The sensitivity of Cd2+ desorption rates were quite different from the sensitivity of apparent desorption rates to soil properties; moreover, the influence of soil properties on desorption rates became more nonlinear. This study demonstrated that sorbed Cd complex should be excluded from total Cd in investigating desorption rates of Cd2+ in soils leached by chelators.
- Subjects
CADMIUM compounds; DESORPTION; SOIL leaching; SORPTION; SENSITIVITY analysis; CADMIUM
- Publication
Environmental Earth Sciences, 2023, Vol 82, Issue 17, p1
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-023-11096-7