Yan Xiu-Lan, Liao Xiao-Yong, Yu Bing-Bing, Zhang Wen-Bin
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Huan Jing Ke Xue. 2011 Mar;32(3):880-5.
Panax notoginseng is a valued traditional Chinese medical herb. In this study, the arsenic (As) contamination of soil in P. notoginseng plantation area in Wenshan (Yunnan, China) was investigated; the absorption and accumulation of soil As by the P. notoginseng was revealed; and the associated health risk was evaluated. The results revealed that the soil As concentrations ranged between 6.9-242.0 mg x kg(-1). Arsenic concentrations in 48% of the total soil samples were > 40 mg x kg(-1). The As concentrations in 24% of main root samples, 81% of fibrous root samples, 14% of stem samples, 57% of leaf samples, and 44% of flower/fruit samples were greater than the regulation concentration of 2.0 mg x kg(-1). Arsenic accumulation in the main root increased with the soil As concentration at soil As concentrations < 100 mg x kg(-1), but sharply decreased with the soil As concentration at soil As concentrations > 100 mg x kg(-1). With increasing soil As concentration, the total biomass of P. notoginseng and the main root biomass decreased. Calculating with the As concentration in different parts of Sanqi P. notoginseng plants, percent of the average ingestion rates of As with ADI regulated by FAO/WHO showed fibrous root > leave > flower/fruit > main root > stem. Based on the As concentration in the main root, the daily As intake accounted for a mean fraction of 12.83% (maximum 45.87%) of the acceptable daily intake specified by FAO/WHO,and the ratio increased with the increasing of soil As concentration. Arsenic contamination of soil and P. notoginseng at the plantation area of Wenshan should not be neglected, and effective strategies should be adopt to reduce As accumulation in the plant and human health risk.
三七是一种珍贵的传统中药材。本研究对中国云南文山三七种植区土壤中的砷（As）污染情况进行了调查；揭示了三七对土壤中砷的吸收和积累情况；并评估了相关的健康风险。结果表明，土壤中砷的浓度范围为6.9 - 242.0 mg·kg⁻¹。48%的土壤样本中砷浓度大于40 mg·kg⁻¹。24%的主根样本、81%的须根样本、14%的茎样本、57%的叶样本和44%的花/果样本中的砷浓度高于2.0 mg·kg⁻¹的规定浓度。在土壤砷浓度<100 mg·kg⁻¹时，主根中的砷积累量随土壤砷浓度增加而增加，但在土壤砷浓度>100 mg·kg⁻¹时，随土壤砷浓度急剧下降。随着土壤砷浓度的增加，三七的总生物量和主根生物量下降。根据三七植株不同部位的砷浓度计算，按粮农组织/世界卫生组织规定的每日允许摄入量（ADI）计算，砷的平均摄入率百分比显示须根>叶>花/果>主根>茎。以主根中的砷浓度计算，每日砷摄入量平均占粮农组织/世界卫生组织规定的每日允许摄入量的12.83%（最高45.87%），且该比例随土壤砷浓度的增加而增加。文山种植区土壤和三七的砷污染不容忽视，应采取有效策略降低植物中的砷积累和人类健康风险。
