Residue Analysis of Copper 8-quinolinolate by Derivative Spectrophotometry

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  • 微分スペクトル法による作物中のオキシン銅の残留分析
  • 微分スペクトル法における作物中のオキシン銅の残留分析
  • ビブン スペクトルホウ ニ オケル サクモツチュウ ノ オキシン ドウ ノ ザ

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Application of derivative spectrophotometry to residue analysis of copper 8-quinolinolate in crops was investigated. The result showed that the derivative spectrophotometry was more suitable than colorimetry, atomic absorption spectrometry and high performance liquid chromatography which were already published. Copper 8-quinolinolate was extracted with acidic methanol from crops. After addition of 1% sodium chloride solution to the methanol extract, the mixture was washed with n-hexane. After neutralizing, the aqueous methanol solution was extracted with dichloromethane. Finally, the pesticide in the dichloromethane solution was re-extracted with 1N hydrochloric acid. Fourth derivative spectrum of the acidic solution was recorded by a Hitachi spectrophotometer type 330. The amount of copper 8-quinolinolate was proportional to the difference absorbance (ΔA=A252-A261) within the range of 0-0.3ppm. The detectable limit of copper 8-quinolinolate was 0.04ppm when 50g of sample was used. Average recovery was about 95%.

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