The Response of Cd Chemical Fractions to Moisture Conditions and Incubation Time in Arable Land Soil

Nan Lu, Yang Wei, Zhaoxin Zhang, Yan Li, Gang Li and Jichang Han
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Nan Lu: Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an Jiaotong University, Technology Innovation Center for Land Engineering and Human Settlements, Xi’an 712000, China
Yang Wei: Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an Jiaotong University, Technology Innovation Center for Land Engineering and Human Settlements, Xi’an 712000, China
Zhaoxin Zhang: Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources, Xi’an 710075, China
Yan Li: Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an Jiaotong University, Technology Innovation Center for Land Engineering and Human Settlements, Xi’an 712000, China
Gang Li: Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an Jiaotong University, Technology Innovation Center for Land Engineering and Human Settlements, Xi’an 712000, China
Jichang Han: Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural Resources, Xi’an 710075, China

Sustainability, 2022, vol. 14, issue 10, 1-15

Abstract: Heavy metal pollution in soils is an issue of global concern, and many scholars have focused on Cadmium (Cd) because of its strong biological migration and toxicity. This study explored arable land soil, changes in external Cd contamination processes and its response to soil moisture conditions, and indoor simulation. After adding an external source of 5 mg/kg d.w., the distribution of soil Cd fractions content, EXC-Cd, CAB-Cd, FMO-Cd, OM-Cd, and RES-Cd, were continuously monitored under different water management regimes, and correlation analysis and regression equations were calculated. The results show that after external Cd entered arable land soils, the binging strength of pollutants and soil gradually increased with incubation time, and the distribution of Cd chemical forms was more stable under different water management regimes. The oversaturated water content promotes the transformation of EXC-Cd to other forms. The transformation of CAB-Cd fractions can be accelerated to other fractions by field capacity, and the active conversion period was 30–60 d. Not all Cd fractions correlated between each other, under the four water management regimes, but it seems that the reducibility of the soil environment was more conducive to external Cd fixation and stability. The response surface design method (RSM) was used to establish quantitative regimes between Cd fractions with incubation time and soil moisture, and the soil moisture content and incubation time had an obvious effect on FMO-Cd content, with R 2 = 0.9542.

Keywords: cadmium; bioavailability; moisture conditions; arable land (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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