Heavy Metal Accumulation Characteristics and Environmental Critical Values in Flowering Cabbage〔Brassica campestris L. ssp. chinensis（L.）var. utilis Tsen et Lee〕Production Area for Food Security
1Research Center for Agricultural Products Quality，Safety and Standard，Guangdong Academy of Agricultural Sciences，Guangzhou 510640，Guangdong，China|2College of Resources and Environment，Huazhong Agricultural University，Wuhan 430070，Hubei，China|3Supervision and Testing Center for Vegetable and Fruit Quality，Ministry of Agriculture，Guangzhou 510640，Guangdong，China
Abstract：Vegetable field soil in situ at the Pearl River delta was collected，and the pot experiment was conducted to study the activities of 5 heavy metals（Cd、Pb、As、Hg、Cr）in soil and the enrichment characteristics of total and available heavy metals in soil by the edible parts of flowering cabbage〔Brassica campestris L. ssp. chinensis（L.）var. utilis Tsen et Lee〕．The environment critical values of 5 heavy metals in flowering cabbage production area for food security，and the impact of soil physicochemical properties on heavy metal absorption in flowering cabbage were explored．The results show that the activity of soil heavy metals（ranked from the highest to the lowest）is Cd＞Pb＞As＞（Cr、Hg），and the heavy metals concentration（ranked from the highest to the lowest）is Cd＞Cr＞As＞Pb．Based on the national standards for maximum levels of heavy metal contaminants in foods（GB 2762-2005），the environmental critical values in the vegetable field were calculated as Cd 1.18 mg?kg-1，Pb 401.93 mg?kg-1，As 25.67 mg?kg-1，Cr 150.71 mg?kg-1，and the critical values of soil available heavy metal were calculated as Cd 0.64 mg?kg-1，As 3.05 mg?kg-1，Cr 4.93 mg?kg-1．The content of Hg in edible parts of flowering cabbage used in the experiment were lower than the criterion．
文典，刘香香，王其枫，王富华，孙芳芳. 菜薹（菜心）对土壤中重金属的富集特征及产地土壤安全临界值[J]. 中国蔬菜, 2012, 1(12): 83-90.
WEN Dian1，2，LIU Xiang-xiang1，2，WANG Qi-feng1，2，WANG Fu-hua1，3*，SUN Fang-fang1，3. Heavy Metal Accumulation Characteristics and Environmental Critical Values in Flowering Cabbage〔Brassica campestris L. ssp. chinensis（L.）var. utilis Tsen et Lee〕Production Area for Food Security. , 2012, 1(12): 83-90.
