显脉旋覆花中重金属及硝酸盐、亚硝酸盐污染的研究

Evaluation of the veined inula contaminated by heavy metals.nitrate and nitrite

测定了云南显脉旋覆花中重金属、硝酸盐和亚硝酸盐的含量。结果表明:根据食品污染物限量标准GB2762-2005,显脉旋覆花的根除重金属Cr符合标准外,其他重金属元素Cd、Pb、Hg、As含量均超标;茎叶除重金属Cr、Cd符合标准外,Pb、Hg、As含量均超标,有潜在污染风险;而根据药用植物及制剂外经贸绿色行业标准WM/T2-2004,显脉旋覆花的根茎叶中所有重金属元素含量均符合标准,无污染风险;亚硝酸盐含量低于世界卫生组织(WHO)和联合国粮农组织1973年规定的标准值,同时也符合中国制定的无公害蔬菜亚硝酸盐含量的限量标准。根据硝酸盐分级评价标准,显脉旋覆花属于一级蔬菜。

The contents of heavy metals, nitrate and nitrite in the veined inula from Yunnan were determined. The results showed that the Cd,Pb,Hg and As contents of the veined inula roots exceeded the amount-limiting standard of food contaminants GB2762-2005 except Cr, and the Pb, Hg and As contents of the stem leaves exceeded the standard GB2762-2005 except Cr and Cd,indicating that there was a potential contamination risk. However, according to the green industry standards for foreign trade in medicinal plants and their preparations WM/T2-2004,all the heavy metal contents were up to the standards without a potential contamination risk. The nitrite content was below the standard value set in 1973 by the World Health Organization and the United Nations Food and Agriculture Organiza- tion and also met the nitrite-limiting standards of green vegetables in China. Besides,the veined inula was a first-grade vegetable according to the grading standard of nitrate.