Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Photodegradation and Degradation Product of Piperophos

Piperophos의 광분해 및 분해생성물에 대한 연구

  • 민경진 (계명대학교 자연과학대학 공중보건학과)
  • Published : 2004.06.01
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Abstract

The present study was performed to investigate photodegradation rate constants and degradation products of piperophos by the USEPA method. The pesticide was very stable in 16 days exposure of sunlight from October 3 to 22, 2003 and humic acid had no sensitizing effect on the photolysis of each pesticide in sunlight. In the UV irradiation test, piperophos was rapidly degraded as increasing UV intensity. In case of UV irradiation with TiO$_2$ and with TiO$_2$ powder amount, degradation of piperophos was slower than UV irradiation. In order to identify photolysis product, the extracts of degradation product was analyzed by GC/MS. The mass spectrum of photolysis product of piperophos was at m/z 166. It was suggested that the photolysis products of piperophos was O, O-dipropyl phosphorodithioate.

Piperophos에 대한 광분해 실험을 수행하여 속도상수와 분해생성물을 측정하였다. 햇빛을 이용한 광분해 실험은 2003년 10월 3일부터 10월 22일 까지 하였으며 상당기간 동안 농약이 햇빛에 안정함을 확인할 수 있었고, humic acid의 광관여 효과가 없음을 알 수 있었다. 자외선을 이용한 광분해 실험에서 piperophos는 자외선을 단독 조사하였을 때 자외선의 세기가 클수록 상대적으로 빠르게 분해되었으며, 광분해 촉매제인 TiO$_2$를 첨가하였을 경우에는 첨가하지 않고 자외선만 조사한 경우보다 상대적으로 느리게 분해되었다. 또, TiO$_2$의 양을 증가시켜도 별 차이가 없었다. 광분해에 의한 분해산물을 확인하고자 UMS분석을 한 결과 piperophos의 분해생성물은 m/z=166의 O,O-dipropyl phosphorodithioate로 추정된다.

Keywords

References

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