Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China.
Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
Sci Rep. 2020 May 20;10(1):8351. doi: 10.1038/s41598-020-65430-1.
Mercury (Hg) exposure poses serious health risks to humans, resulting in extensive investigations examining Hg accumulation, biotransformation and uptake in crops. In this investigation, Hg accumulation in potato tubers due to bioaccumulation processes was determined and bioconcentration factors affecting bioaccumulation were identified using a greenhouse experiment. Our results showed that the percentage of available Hg concentrations from total Hg in soil samples were less than 1.2%, indicating that soils used in our experiment exhibited a high binding strength for Hg, with alkaline soil recording the lowest available Hg/total Hg ratio. Results indicated that soil type and Hg treatment, as well as their interactions, significantly affected Hg accumulation in potato tubers (P < 0.01). Importantly, our results also indicated that potatoes grown in soil with a Hg concentration two times higher than the Chinese Environmental Quality Standard exhibited no obvious toxic effects on humans; Bioconcentration factors (BCF) values (<0.04) suggested that potatoes can be considered as a low Hg accumulating species and suitable for human consumption. Potato yields in acidic soil were lower than those in neutral or alkaline soils, making this medium unsuitable for growth.
汞 (Hg) 暴露对人类健康构成严重威胁，因此人们广泛研究了汞在作物中的积累、生物转化和摄取。本研究通过温室试验，确定了由于生物累积过程导致马铃薯块茎中汞的积累情况，并确定了影响生物累积的生物浓缩系数。结果表明，土壤样品中总汞的可利用汞浓度百分比小于 1.2%，表明实验中使用的土壤对汞具有很强的结合力，碱性土壤的可利用汞/总汞比值最低。结果表明，土壤类型和汞处理及其相互作用显著影响马铃薯块茎中汞的积累（P<0.01）。重要的是，我们的结果还表明，在汞浓度比中国环境质量标准高两倍的土壤中种植的马铃薯对人体没有明显的毒性作用；生物浓缩系数（BCF）值（<0.04）表明，马铃薯可以被认为是一种低汞积累物种，适合人类食用。在酸性土壤中，马铃薯的产量低于中性或碱性土壤，因此这种土壤不适合生长。
