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| Heavy Metal Detection and Analysis of Influence Factors in Main Taro ProductionAreas of Shandong Province |
| In this study，sampling test of heavy metals of tuber〔Colocasia esculenta（L.）Schott〕，soil and water were performed in main production areas of Shandong Province．The results indicated that As，Hg and Pb contents of 83 tuber samples did not exceed the maximum limits of GB 18406.1—2001．Cd content of 33 samples with relatively even distribution exceeded the limit of 0.05 mg·kg-1 by a very small amount．The highest value of Cd content was 0.36 mg·kg-1．According to GB/T 18407.1—2001，the As，Hg，Pb content of 83 soil samples did not exceed the maximum limits，while the Cd content of 6 soil samples exceeded the limit of 0.3 mg·kg-1（pH ＜ 7.5）with highest value 0.944 mg·kg-1．Four heavy metal contents of 31 water samples
did not exceed the maximum limits．It referred that taro production areas in Shandong Province were not polluted by the above mentioned 4 heavy metals．Further analysis revealed that the Pb and Cd contents of tubers were very significantly or significantly correlated with the Pb and Cd contents of soil，indicating that Pb and Cd in tubers mainly come from soil．The Cd content of tubers had a very significant negative correlation with pH value of soil，
and the Cd，As and Pb contents in soil were very significantly or significantly correlated with the organic substance content，which indicating that pH value and organic matter contents were the main factors influencing heavy metal accumulation．The usage of agricultural medicine and fertilizers might cause Cd accumulation in some areas of Shandong Province． |
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Abstract In this study，sampling test of heavy metals of tuber〔Colocasia esculenta（L.）Schott〕，soil and water were performed in main production areas of Shandong Province．The results indicated that As，Hg and Pb contents of 83 tuber samples did not exceed the maximum limits of GB 18406.1—2001．Cd content of 33 samples with relatively even distribution exceeded the limit of 0.05 mg·kg-1 by a very small amount．The highest value of Cd content was 0.36 mg·kg-1．According to GB/T 18407.1—2001，the As，Hg，Pb content of 83 soil samples did not exceed the maximum limits，while the Cd content of 6 soil samples exceeded the limit of 0.3 mg·kg-1（pH ＜ 7.5）with highest value 0.944 mg·kg-1．Four heavy metal contents of 31 water samples did not exceed the maximum limits．It referred that taro production areas in Shandong Province were not polluted by the above mentioned 4 heavy metals．Further analysis revealed that the Pb and Cd contents of tubers were very significantly or significantly correlated with the Pb and Cd contents of soil，indicating that Pb and Cd in tubers mainly come from soil．The Cd content of tubers had a very significant negative correlation with pH value of soil，
and the Cd，As and Pb contents in soil were very significantly or significantly correlated with the organic substance content，which indicating that pH value and organic matter contents were the main factors influencing heavy metal accumulation．The usage of agricultural medicine and fertilizers might cause Cd accumulation in some areas of Shandong Province．
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Received: 29 September 2013
Published: 22 January 2014
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