The aims of this study were to investigate and confirm the occurrence and distribution patterns of iodinated X-ray contrast media (iopromide) in Nakdong river basin (mainstream and its tributaries). Iopromide was detected in 16 sampling sites. The concentration levels of iopromide on February 2011 and on October 2011 in surface water samples ranged from not detected (ND) to 1481.1 ng/L and ND to 1168.2 ng/L, respectively. The highest concentration level of iopromide in the mainstream and tributaries in Nakdong river were Goryeong and Jincheon-cheon, respectively. The sewage treatment plants (STPs) along the river affect the iopromide levels in river and the iopromide levels decreased with downstream because of dilution effects.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. Iopromide
  2.2. 낙동강 수계 시료채수 지점 및 채수
  2.3. 시료수 전처리
  2.4. Iopromide 분석
 3. 결과 및 고찰
  3.1. 낙동강 본류에서의 iopromide 분포 특성
 4. 결 론
 참 고 문 헌

• 염훈식(부산광역시 상수도사업본부 수질연구소) | Hoon-Sik Yoom (Water Quality Institute, Busan Water Authority)
• 손희종(부산광역시 상수도사업본부 수질연구소) | Hee-Jong Son (Water Quality Institute, Busan Water Authority) Corresponding author
• 류동춘(부산광역시 상수도사업본부 수질연구소) | Dong-Choon Ryu (Water Quality Institute, Busan Water Authority)
• 장성호(부산대학교 지역환경시스템공학과) | Seung-Ho Jang (Department of Environment System Engineering, Pusan National University)