Nature Environment and Pollution Technology

Jinlong Yan ¹, Guixiang Quan ¹

Affiliations
1 School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, CN

Abstract

Effects of Hg²⁺ and Cd²⁺ on the activities of urease, invertase and amylase in different periods and concentration were studied by indoor soil cultivating method. Results showed that the activities of soil urease, invertase, and amylase by heavy metals were inhibited markedly, but this inhibitory effect differed among enzymes. During the treatment of 45 days, the activities of urease, invertase and amylase were decreased with the increase of the concentrations of Hg²⁺. There were significant logarithmic correlations between the concentration of heavy metals and the inhibition ratios of the activities of these three enzymes (r² > 0.902). The inhibitory effect was also characterized in the term of ecological dose value (ED₅₀). It indicated that urease activity was more sensitive than the other two enzymes to heavy metals contamination. So, urease activity may be a suitable early warning index to be used in the characterization the soil pollution condition of heavy metals.

Keywords

Ecological Dose, Heavy Metals, Kinetic Model, Inhibition of Soil Enzymes.

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