The analytical method for 16 organophosphorus pesticides was developed in this study. The 16 organophosphorus pesticides were analyzed by liquid chromatography-tandem mass spectrometry (LC/MS/MS) using on-line solid phase extraction (on-line SPE) with PLRP- S cartridge. Analysis of all analytes in the MS/MS was processed in the electrospray ioni-zation (ESI) positive mode. They are Azinphos ethyl, Chlorfenvinphos, Ethion, Famphur, Phosmet, Phosphamidon, Terbufos, Aspon, Chlorpyrifos-methyl, Crotoxyphos, Dichlofenthi-on, Dicrotophos, Fonofos, Thionazin, Dimethoate and Iprobenfos. Limits of detection (LODs) and Limits of quantification(LOQs) were obtained as 0.8~2.0 ng/L and 2.6~6.4 ng/L, respectively. All compounds were not detected at the 8 sampling points of the raw water and clean water.

Abstract
 1. 서론
 2. 실험재료 및 방법
  2.1. 표준물질 및 시약
  2.2. 채수시기 및 채수방법
  2.3. 기기분석방법
 3. 결과 및 고찰
  3.1. 기기분석조건 최적화
  3.2. 시험방법에 대한 유효성 평가
  3.3. 원․정수의 유기인계 농약류 검출현황 조사
 4. 결론
 REFERENCES

• 김경아(부산광역시 상수도사업본부 수질연구소) | Gyung-A Kim (Water Quality Institute, Busan Water Authority) Corresponding author
• 송미정(부산광역시 상수도사업본부 수질연구소) | Mi-Jeong Song (Water Quality Institute, Busan Water Authority)
• 염훈식(부산광역시 상수도사업본부 수질연구소) | Hoon-Sik Yeom (Water Quality Institute, Busan Water Authority)
• 손희종(부산광역시 상수도사업본부 수질연구소) | Hee-Jong Son (Water Quality Institute, Busan Water Authority)
• 이상원(부산광역시 상수도사업본부 수질연구소) | Sang-Won Lee (Water Quality Institute, Busan Water Authority)
• 최진택(부산광역시 상수도사업본부 수질연구소) | Jin-Tack Choi (Water Quality Institute, Busan Water Authority)