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| The relationship between cadmium in wheat plant and cadmium extracted by EDTA and diluted acids in soil in Huanghuaihai Plain |
| Received:July 05, 2016 |
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| KeyWord:Huanghuaihai Plain;wheat;total Cd;extractable Cd |
| Author Name | Affiliation | E-mail | | XIONG Zi | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHAO Hui-wei | The Semi-arid Agriculture Science and Technology Research Center of China, Shijiazhuang 050051, China | | | LI Ju-mei | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | lijumei@caas.cn | | MA Yi-bing | National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | |
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| Abstract: |
| The relationship between the concentrations of soil extractable cadmium(Cd) and Cd taken up by wheat plant is important to evaluate soil testing for extractability and availability of Cd in soil. In the present study, the concentrations of soil Cd extracted by 0.43 mol·L-1 HNO3, 0.1 mol·L-1 HCl and 0.05 mol·L-1 EDTA, as well as related to the concentration of Cd in wheat plant was investigated using 11 field soil samples and 24 wheat varieties collected from Huanghuaihai plain. The results showed that the percentage of extractable Cd to total Cd in soils was found in the order:58.7%(0.43 mol·L-1 HNO3) > 53.2%(0.05 mol·L-1 EDTA) > 25.9%(0.1 mol·L-1 HCl). However, the correlations between the concentrations of soil Cd extracted by the 3 extractants themselves were significant. It was also found that the correlation coefficients(r) between soil Cd extracted by these extractants and Cd in wheat plant in the order:r=0.74(0.05 mol·L-1 EDTA)>r=0.64(0.43 mol·L-1 HNO3)>r=0.49(0.1 mol·L-1 HCl), which indicated that chelating agents, such as EDTA, are better than diluted acids, such as HNO3 or HCl, because most of soils in this area are calcareous soils. In the specific area where soil pH ranged from 7.71 to 8.59 and soil total Cd ranged from 0.107 to 0.212 mg·kg-1, the regression equations of EDTA extractable Cd combined with the soil pH were developed and can be used to predict the concentrations of Cd in wheat plants very well although soil total Cd also worked well. According to the regression equations and the limits of Cd in wheat grains, the safety critical values of EDTA extractable and total Cd in soil were estimated as 0.671 mg·kg-1 and 1.02 mg·kg-1, respectively. These results are very helpful for risk assessment of Cd in soils and wheat grains in the main wheat producing area-Huanghuaihai Plain. |
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