Abstract
A novel method of dimethoate degradation using the fungus Aspergillus niger wasproposed. In addition, calcium phosphate was obtained as a byproduct from the organophosphate pesticide by inductive synthesis. The method involves culturing A. nigerin a modified Czapek liquid medium with glass powder, CaCl2, and dimethoate. Gas chromatography was subsequently used to analyze the degradation effect of A. niger on the dimethoate and X-ray diffraction was used to identify the components of the mineral particles wrapped in mycelial pellets. The results indicate that A. niger can effectively degrade the pesticide in the modified Czapek medium and, under the conditions used, induce the formation of calcium phosphate from the phosphorus released in the degradation products and the calcium ions available in the liquid medium. The research highlights the microbial degradation of organophosphate pesticides and the inductive synthesis of bio-mineralization. Thus, a new technology for environmental bio-remediationwas proposed. Key words: Aspergillus niger, organophosphate pesticides, dimethoate, degradation, calcium phosphate, bio-mineralization.
Highlights
Organophosphate pesticides are a widely used and effective group of insecticides developed shortly after organochlorine pesticides
The results indicate that A. niger can effectively degrade the pesticide in the modified Czapek medium and, under the conditions used, induce the formation of calcium phosphate from the phosphorus released in the degradation products and the calcium ions available in the liquid medium
The research highlights the microbial degradation of organophosphate pesticides and the inductive synthesis of bio-mineralization
Summary
Organophosphate pesticides are a widely used and effective group of insecticides developed shortly after organochlorine pesticides. There are more than 150 different types and they play an important role in agricultural production (Dai, 2008). Their use will contaminate soil, underground water, and surface water following prolonged or excessive use. It is essential that an effective way of eliminating organophosphate contamination is found. Detoxification and degradation of residual pesticide using microbes is becoming an effective method of controlling and treating environmental contamination especially in the case of pesticides (Aislabie and Lloyd-Jones, 1995). Eliminating pesticide contamination using microbes has several advantages, such as the large variety of microbes available, high mutation speeds, and convenience in culturing
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