Study on the Safety Threshold of Soil Nickel in High Nickel Basalt Geological Background
Basalt is a high nickel geological body.The existing soil environmental quality standards for agricultural land are not fully applicable to land evaluation in these areas with high geological background.Based on the health risk assessment of the main crops(tea)in Xinchang basalt platform,Zhejiang Province,and combined with seed germination and nickel toxicity experiments of algae,this study explored and established the safety threshold of soil nickel in the area with high nickel geolog-ical background.The results showed that the soil classification results based on the current national standards were significant-ly inconsistent with the crop health risk assessment results.The culture experiment showed that biotoxicity appeared when Ni in water reached 0.74 mg/L.Based on the soil water content and the ratio of water-soluble Ni to active Ni,the safety threshold of available Ni and total Ni on basalt platform were estimated to be 1.73 mg/kg and 100.46 mg/kg respectively.The soil in this area was reevaluated based on the recommended Ni safety threshold,and the results are in good agreement with the actual situation.
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