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Environmental Monitoring and Assessment

, Volume 169, Issue 1–4, pp 285–297 | Cite as

Pesticide residues in soils, sediments, and vegetables in the Red River Delta, northern Vietnam

  • Takuro Nishina
  • Chu Ngoc Kien
  • Nguyen Van Noi
  • Ha Minh Ngoc
  • Chul-Sa Kim
  • Sota Tanaka
  • Kōzō Iwasaki
Article

Abstract

This study assessed pesticide residues in soils, sediments, and vegetables in the Xuan Khe and Hop Ly communes located along the Chau Giang River in the Red River Delta, northern Vietnam. Samples were collected from agricultural areas within and outside of embankments built to prevent flooding. In Xuan Khe, the soils outside of the embankment were more clayey with higher organic matter contents compared with the inside, due to selective deposition during river flooding. Many of the soils contained significant amounts of pesticides including dichlorodiphenyltrichloroethane (DDT), dicofol, isoprothiolane, and metalaxyl although their levels were below the maximum allowable concentration set by the Vietnamese government. The spectrum of DDT derivatives found suggested that the source of DDTs was not contaminated dicofol. Soils in Hop Ly resembled soils in Xuan Khe but were relatively sandy; one field showed appreciable contents of DDT derivatives. The ratios of (p,p -dichlorodiphenyldichloroethylene + p,p -dichlorodiphenyldichloroethane)/∑DDT in the surface and subsurface soils in Hop Ly were 0.34 and 0.57, suggesting that the DDTs originated from recent application. Pesticide residues in soils were not likely to translocate into vegetable crops, except for metalaxyl. High concentrations of cypermethrins in kohlrabi leaves could be ascribed to foliar deposition.

Keywords

Pesticide residues DDTs Red River Delta Flooding Soils Vegetables 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Takuro Nishina
    • 1
  • Chu Ngoc Kien
    • 2
  • Nguyen Van Noi
    • 3
  • Ha Minh Ngoc
    • 3
  • Chul-Sa Kim
    • 1
  • Sota Tanaka
    • 4
  • Kōzō Iwasaki
    • 1
  1. 1.Faculty of AgricultureKochi UniversityNankokuJapan
  2. 2.United Graduate School of Agricultural SciencesEhime UniversityEhimeJapan
  3. 3.Faculty of ChemistryHanoi University of ScienceHanoiVietnam
  4. 4.Graduate School of Kuroshio ScienceKochi UniversityKochiJapan

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