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Sorption of atrazine and ametryn by carbonatic and non-carbonatic soils of varied origin

Kasozi , G.N. ; Nkedi-Kizza , P. ; Li , Y. ; Zimmerman , A.R.

Environmental pollution, 2012, Vol.169, pp.12-19 [Tạp chí có phản biện]

ISSN: 0269-7491

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  • Nhan đề:
    Sorption of atrazine and ametryn by carbonatic and non-carbonatic soils of varied origin
  • Tác giả: Kasozi , G.N. ; Nkedi-Kizza , P. ; Li , Y. ; Zimmerman , A.R.
  • Chủ đề: Oxisols ; Sodium Hypochlorite ; Histosols ; Sorption ; Atrazine ; Carbon ; Hydrogen Peroxide ; Ametryn ; Organic Matter ; Spodosols
  • Là 1 phần của: Environmental pollution, 2012, Vol.169, pp.12-19
  • Mô tả: Sorption of two s-triazines, atrazine and ametryn, by carbonatic soils, Histosols, Spodosols and Oxisols was examined. Linear isotherms were observed and sorption coefficients (Kd) of both compounds were significantly lower (α = 0.05) onto carbonatic soils compared to non-carbonatic soils. Furthermore, among carbonatic soil types, the marl-carbonatic soils had the lowest sorption affinities. Kd and organic carbon content were highly correlated, suggesting predominant influence of organic carbon in the sorption of the s-triazine, except in Oxisols and Spodosols where variations suggest other factors. Upon removal of organic matter (OM) using sodium hypochlorite and hydrogen peroxide, the Kd values were reduced by ∼90%, indicating minimal contribution of mineral surfaces. Thus OM compositional differences likely explain the large variation in s-triazine sorption within and between soil orders. This study highlights the need to consider OM composition in addition to quantity when determining pesticide applications rates, particularly for carbonatic soils. ; p. 12-19.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0269-7491

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