• Journal of Korean Society on Water Environment
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• v.21 no.4
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• pp.332-336
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• 2005

The average specific growth rate of C. reinhardtii (${\mu}$) was decreased with increase in biocide concentrations. The toxicity of biocides toward was as follows (in descending order of toxicities): herbicide 〉 pesticide 〉fungicide. $EC_{50}$ in each biocide was 0.0017 mg/L, 1.06 mg/L and 13.3 mg/L for herbicide, pesticide and fungicide respectively. When herbicide and pesticide were mixed, $EC_{50}$ was decreased by $2.7{\times}10^{-7}mg/L$. $EC_{50}$ in effective components of each biocide was 5.26 mg/L, 9.37 mg/L and 20.58 mg/L for herbicide, pesticide and fungicide respectively. Mixed main components of herbicide and pesticide caused to decrease by 3.10 mg/L.

• Analytical Science and Technology
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• v.25 no.6
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• pp.364-369
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• 2012

Isotianil is a novel fungicide which induces systemic acquired resistance in plants. It has excellent preventive effects as low dosages against rice blast which is one of the most serious diseases in rice. The Maximum Residue Limit (MRL) of Isotianil in republic of korea was set to 0.1 mg/kg in rice, so it is necessary to determine levels of Isotianil residues in agricultural commodities for controlling food safety. Therefore, The purpose of this study was to develop analytical method for the determination of isotiical residues in agricultural commodities using GC-NPD/MSD. Isotianil was extracted with acetonitrile from apple, chinese cabbage, hulled rice, mandarin, pepper, and soybean. The extract was diluted with saline water, and then dichloromethane partition was followed to recover this fungcide from the aqueous phase. A solid phase extraction with Florisil cartridge was additionally employed for final clean up. Isotianil was analyzed and quantitated by GC-NPD and confirmed by GC-MSD. Average recovery of Isotianil ranged from 70.0 to 103.9% in six representative agricultural commodities with relative standard deviations less than 10%, and limit of quantification (LOQ) was 0.05 mg/kg.