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2018, Volume 12, Issue 2

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Frontiers of Environmental Science & Engineering >> 2018, Volume 12, Issue 2 doi: 10.1007/s11783-017-0990-y

Field evidence of decreased extractability of copper and nickel added to soils in 6-year field experiments

. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.. Colleges of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.. Departments of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China.. Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Available online: 2017-09-01
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Abstract

The phytotoxicity of added copper (Cu) and nickel (Ni) is influenced by soil properties and field aging. However, the differences in the chemical behavior between Cu and Ni are still unclear. Therefore, this study was conducted to investigate the extractability of added Cu and Ni in 6-year field experiments, as well as the link with their phytotoxicity. The results showed that the extractability of added Cu decreased by 6.63% (5.10%–7.90%), 22.5% (20.6%–23.9%), and 6.87% (0%–17.9%) on average for acidic, neutral, and alkaline soil from 1 to 6 years, although the phytotoxicity of added Cu and Ni did not change significantly from 1 to 6 years in the long term field experiment. Because of dissolution of Cu, when the pH decreased below 7.0, the extractability of Cu in alkaline soil by EDTA at pH 4.0 could not reflect the effects of aging. For Ni, the extractability decreased by 18.1% (10.1%–33.0%), 63.0% (59.2%–68.8%), and 22.0% (12.4%–31.8%) from 1 to 6 years in acidic, neutral, and alkaline soils, respectively, indicating the effects of aging on Ni were greater than on Cu. The sum of ten sequential extractions of Cu and Ni showed that added Cu was more extractable than Ni in neutral and alkaline soil, but similar in acidic soil.

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