Sorption and leaching of diuron on natural and peat-amended calcareous soil from Spain

González‐Pradas, E.; Villafranca-Sánchez, M.; Fernández-Pérez, Manuel; Socías-Viciana, M.; Ureña-Amate, M.D.

doi:10.1016/s0043-1354(98)00021-9

Cited by 45 publications

(23 citation statements)

References 18 publications

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“…Sorption coefficients normalized for organic C content (K OC ) were calculated and these are also presented in Table 1. The average K OC value across all of the soils was 723 Lkg -1 , which is higher than the average diuron K OC values reported in previous studies [13,14,18,20,22]. However, the average for the A11 horizons of 487 Lkg -1 is quite consistent with these literature values and represents a more meaningful comparison given that most literature values are for topsoils.…”

Section: Resultssupporting

confidence: 76%

“…There are also differences in the 13 C CP NMR spectra within the A11 and, especially, the A12 horizons. For example, the aryl resonances in the spectra of samples 28A12 and 30A12 are stronger than in the spectra of the other A12 horizons.…”

Section: Resultsmentioning

confidence: 98%

“…Preliminary experiments showed sorption isotherm are linear thus it is unlikely that non-linearity of sorption isotherms is the cause of the differences in sorption between soil A11 and A12 horizons. The solid-state 13 C CP NMR spectra of the soils (Figure 4) do indicate that there are differences in the chemistry of the organic matter between the soils. Consistent differences between the A11 and A12 horizons are evident -the aryl C peak at ~130 ppm is stronger for the A12 horizons and the ratio of the alkyl resonance (~30 ppm) to the O-alkyl resonance (~75 ppm) is greater for the A12 horizons.…”

Section: Resultsmentioning

confidence: 99%

“…Solid-state 13 C cross polarization (CP) NMR spectra were acquired with magic angle spinning (MAS) at a 13 C frequency of 50.3 MHz on a Varian Unity200 spectrometer. Samples were packed in a 7 mm diameter cylindrical zirconia rotor with Kel-F end-caps and spun at 5000±100 Hz in a Doty Scientific MAS probe.…”

Section: Nmr Analysismentioning

confidence: 99%

“…Previous studies have found K OC to vary less at these scales than at larger scales [11,21]. Our aim is to test whether under these restricted conditions, a relationship between K OC and organic matter chemistry as determined by solid-state 13 C NMR spectroscopy can be identified.…”

Section: Introductionmentioning

confidence: 96%

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Role of the chemistry of soil organic matter on the sorption of diuron

Ahangar¹,

Smernik²,

Kookana³

2008

WIT Transactions on Ecology and the Environment

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The influence of organic matter chemistry on the sorption of diuron to soils collected from a small (2 ha) field was investigated. Organic carbon-normalized sorption coefficients (K OC ), determined by batch sorption, varied between 405 and 598 Lkg -1 amongst 10 A11 horizons, and between 547 and 975 Lkg -1 amongst 10 matching A12 horizons. In all cases K OC was greater for the A12 horizon than the corresponding A11 horizon by 27-81%. Organic matter chemistry of the A11 and A12 horizons was determined using solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy. K OC was positively correlated with aryl C (r 2 = 0.61, significance level 0.001) and negatively correlated with O-alkyl C (r 2 = 0.88, significance level <0.001) as a single factor and as a combination of both we also propose A index (r 2 = 0.65, significance level 0.001). Little change in soil mineralogy across a very small field led to diminished organic matter and clay mineral interactions, allowing the effect of organic matter chemistry on K OC to be clearly seen.

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