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Copper and zinc content in soil and their accumulation in some agricultural products in Ha Mo Co operative, Dan Phuong district, Hanoi

Copper and zinc are also toxic to humans when high levels are ingested and an excess of copper and zinc interferes with plant growth. It is important to monitor copper and zinc content in soil to avoid marketing food products which contain dangerous amounts of these heavy metals. This article presents the results of a study done to determine the copper and zinc content of soil and four agricultural products grown in Tan Lap Co-operative, Dan Phuong District, Hanoi. | JOURNAL OF SCIENCE OF HNUE Chemical and Biological Sci. 2012 Vol. 57 No. 8 pp. 66-71 This paper is available online at http stdb.hnue.edu.vn COPPER AND ZINC CONTENT IN SOIL AND THEIR ACCUMULATION IN SOME AGRICULTURAL PRODUCTS IN HA MO CO-OPERATIVE DAN PHUONG DISTRICT HANOI Vu Van Hien Faculty of Biology Hanoi National University of Education Abstract. Analytical results of Cu and Zn content in 20 soil and 20 pricipal agricultural products samples collected in Ha Mo Co-operative Dan Phuong District Hanoi in 2009 and 2010 indicate that the average total Cu content in the examined soil is 32.12 mg kg 1 and average available Cu content is 12.84 mg kg 1 . The average total Zn content is 90.18 mg kg 1 and average available Zn content is 13.01 mg kg 1 . The Cu and Zn content in the soil samples is within permissible limits of heavy metal in agricultural soils by Vietnamese standards. The amount of Cu in rice grain cabbage leaves and tomato and cucumber fruit was found to be 2.81 mg kg 1 and respectively 0.75 mg kg 1 1.13 mg kg 1 and 0.79 mg kg 1 fresh weight. The amount of Zn in rice grain cabbage leaves and tomato and cucumber fruits was found to be 20.22 mg kg 1 and respectively 1.29 mg kg 1 3.60 mg kg 1 and 1.81 mg kg 1 fresh weight. The Cu and Zn content in these four agricultural products was found to be below the limit set by FAO WHO. Keywords Copper zinc soil rice grain cabbage tomato cucumber. 1. Introduction In areas which experience a tropical climate with torrential rains and high temperatures agricultural soils have a low organic matter content due to increased mineralization of organic matter after cultivation tillage methods which physically disrupt the soil surface and erosion of top soil. Consequently these soils benefit from an application of organic matter to improve their quality and fertility. Organic fertilizers organic residues municipal refuse sewage sludge animal waste are organic materials which are commonly applied to improve the soil s physical