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GEOGRAPHICAL RESEARCH >

2008 , Vol. 27 >Issue 6: 1340 - 1346

DOI: https://doi.org/10.11821/yj2008060013

Environment and Ecology

Concentrations and risk of heavy metals in grain of wheat grown in Beijing

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  • 1. Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101,China;
    2. School of Geographic and Biologic Sciences, Guizhou Normal University, Guiyang 550001, China;
    3. Agricultural College, Guangxi University,Nanning 540004, China;
    4. Green Port Sludge Treatment Plant, Qinhuangdao City Administrative Bureau, Qinhuangdao 066000, China

Received date: 2008-04-08

  Revised date: 2008-09-19

  Online published: 2008-11-25

Supported by

中国科学院知识创新工程重大项目(KZCX1-YW-06)

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Abstract

Soil and wheat samples in wheat-planted area in Beijing were collected for assessing the concentration and health risk of heavy metals.The results show that the average concentrations of As,Cd,Cr,Cu,Ni,Pb and Zn in the soils from wheat fields are 7.4, 0.165, 37.8, 20.3, 24.2, 14.3 and 70.1 mg/kg, respectively, which are lower than the baseline concentration of soil from Beijing. It shows that planting wheat did not definitely increase the concentrations of heavy metals in soil. The average concentrations of As, Cd, Cr, Cu, Ni, Pb and Zn in wheat are 0.032, 0.031, 0.967, 7.05, 0.293, 0.17 and 33.7 mg/kg, respectively. The concentrations of As, Cd, Cu, Ni, Pb and Zn are significantly less than the maximum levels of Food Hygiene Standards of China, and there is no significant difference between Cr concentration in wheat and the maximum Cr level of Food Hygiene Standards. Among the heavy metals, the accumulating ability of wheat for Zn is the best and that of As is the weakest.The average intake rates of As, Cd, Cr, Cu, Ni, Pb and Zn from wheat for people lived in Beijing are 0.005, 0.004, 0.136, 0.994, 0.041, 0.024 and 4.75 mg/(person day) and there is no significant risk caused by heavy metals intake for common residents in Beijing from staple and vegetables according to the average concentrations of metals and the average consumption.Among the districts of Shunyi, Fangshan, Daxing and Tongzhou, the largest wheat planted areas in Beijing, the average intake rates of Cr, Cu, Ni and Pb in wheat from Shunyi District are higher than those from the other three districts, while the average heavy metal intake rate of wheat from Fangshan is the lowest.

Key words： Beijing; health risk; heavy metal; intake; soil; wheat

Cite this article

LI Xiao-yan, CHEN Tong-bin, TAN Yong-bi, FU Ben-tian, YANG Jun, SONG Bo, YANG Su-cai, XIE Yun-feng . Concentrations and risk of heavy metals in grain of wheat grown in Beijing[J]. GEOGRAPHICAL RESEARCH, 2008 , 27(6) : 1340 -1346 . DOI: 10.11821/yj2008060013

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