AI Article Synopsis
- Tianjin has a significant issue with soil cadmium (Cd) contamination due to historical sewage irrigation in its maize production region.
- In the Baodi and Jinghai Districts, a notable percentage of soil samples exceeded risk control values for Cd, despite maize samples displaying lower levels, likely due to soil conditions such as pH and organic matter.
- The study found that the DGT method effectively correlates bioavailable Cd levels in soil with Cd accumulation in maize grains, indicating its usefulness for assessing metal release from contaminated agricultural lands.
Article Abstract
Tianjin, as an important maize production region in China, has a long history of sewage irrigation resulting in the soil cadmium (Cd) contamination. In this study, single extractions of CaCl and HNO, BCR sequential extraction and the diffusive gradients in thin films technique (DGT) were used to measure the bioavailable Cd content in soils. The Cd content in soil samples all exceeded the background values, with 14.3% and 33.3% of sites in the Baodi District (BDD) and Jinghai District (JHD) exceeding the risk control values, respectively. The average content of Cd in maize samples is lower than the pollution control values, which may be related to the higher pH (8.53) and organic matter (OM) content (15.01 g kg) in soils. Bioavailable Cd measured by DGT correlated well with Cd in maize grains (R =0.92). The DGT and DIFS model predicted the metals release from the agricultural lands, the total concentration of Cd in soil was relatively low, but the labile Cd in the soils has adequate metal release capability. This study shows that DGT is efficient in predicting Cd accumulation in grains from contaminated soils.
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| http://dx.doi.org/10.1016/j.jhazmat.2020.124837 | DOI Listing |
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