Dissertation
Dissertation > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil chemistry, soil physical and chemical

Retention Characteristics of Copper and Influencing Factors of the Availability of Added Copper in Soil

Author ZhaoTianYi
Tutor LiChengHou
School Guizhou University
Course Soil
Keywords copper retention characteristics availability organic matters iron oxide pyrite soil pollution
CLC S153
Type Master's thesis
Year 2006
Downloads 95
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The effects of the soil properties on its retention characteristics were discussed. Considering the differences of soil properties, the effects of different kinds of organic matters, iron oxide and pyrite on the characteristics of copper retention or the availability of added copper under different incubating conditions (aerobic, submerged and redried) were studied. The factors of the availability of added copper in soils were discussed further. Retention characteristics of copper added in several soils were studied by the method of isothermal adsorption. The results showed that: the pH value, the Eh value, OM and oxides status are much more important factors in the effectiveness of the characteristics of copper retention or the availability of added copper.1. In the same concentration of Cu2+ standard solution, the net retention capacity of siallitic yellow soil or brunisolic soil was about 2.5 times as that of Quaternary period red clay or yellow soil. Both of vegetable soil and calcareous soil contain CaCO3, and the net retention capacity of them was about 3.0-6.5 times as that of Quaternary period red clay or yellow soil.2. The contents of available copper could be decreased obviously by reducing the Eh value. Although the Eh value became high during the redried incubation, the contents of available copper in yellow soil and calcareous soil were less than the recruitment: the contents of available copper in yellow soil and in calcareous soil were 47.0%60.0% and 3.0%4.5% of the recruitment respectively.3. Iron oxide and pyrite could provide Fe for the formation of Fe-OM complexes, so the specific adsorption of copper in soil was promoted and the contents of available copper were decreased. Under submerged, pyrite had significant effects on the reduction of the contents of available copper in yellow soil and calcareous soil.4. Organic matters could change the Eh value, the pH value and oxides status of soil by promoting the vital activity of soil microbiology to improve the characteristics of copper retention and reduce the contents of available copper. Corn straw and glucose/peptone can be easily decomposed; coal and peat contain much more stable humus. The effects of the former were more obvious than the latter.

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