Atrazine bound residues formation and dissipation in subtropical soil under swine wastewater application

Gonçalves, Morgana Suszek; Sampaio, Sílvio César; Coelho, Sílvia Renata Machado; Suszek, Floriano Luiz; Cordovil, C.

doi:10.1590/s0100-69162012000600017

Cited by 4 publications

(3 citation statements)

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“…Shepard diagram (Figure 2) shows that 16 of the 22 samples have a clayey texture, corroborating the results found by GONÇALVES et al (2012) and SANTOS et al (2015) in an Oxisol of western Paraná. Moreover, six samples from sites S2, S8, and S10 presented sandy clay texture.…”

Section: Resultssupporting

confidence: 88%

“…2017 566 more reliable geochemical background. For instance, JUCHEN et al (2014) sampled preserved areas (legal reserves) and used parametric statistical analysis, REIMANN et al (2005) proposed an approach composed by sampling in different locations and application of non-parametric and spatial statistical analysis, and PAYE et al (2012) sampled in areas without anthropic action and used multivariate statistics.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical Background in an Oxisol

et al. 2017

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Geochemical background establishment is indispensable to determine the actual state of contamination of soils and sediments. However, no scientific consensus exists regarding the methodology for determining these values. In this context, this study aimed to establish the geochemical background in an Oxisol (Rhodic Hapludox) by means of an integrated method that uses direct and indirect soil analyses to identify the most appropriate calculation methodology. Soil samples were collected in a permanent preservation area of the Cascavel River watershed, PR, Brazil. The elements Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn present in soil samples were quantified by flame atomic absorption spectrometry. The use of a permanent preservation area is the most effective method to establish the geochemical background in the Cascavel River watershed. However, soil chemical element concentrations have spatial variability and dependence, requiring the application of non-parametric statistical methods based on third quartile and median for establishing the geochemical background.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Geochemical Background in an Oxisol

et al. 2017

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“…The addition of cattle manure to the soils may be an alternative to avoid herbicide losses by draining or leaching due to the sorption increase, as already proven with the addition of organic compounds in the works done by Mendes et al (2016), Gonçalves et al (2012) and Briceño et al (2008). However, most desorption experiments showed higher K fd values with the increase of the manure incubated in LVAG and LVAV soils.…”

Section: (A) (B) (A) (B)mentioning

confidence: 84%

Sorption and Desorption of Diuron, Hexazinone and Mix (Diuron + Hexazinone) in Soils With Different Attributes

et al. 2018

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In Brazil, sugarcane is grown in large areas. Weed control in sugarcane fields is done by chemical method, since it is more efficient and less expensive. In this method, herbicides that persist in the environment for long periods are used, among which there are hexazinone and diuron, which are applied in mixtures marketed by the industry. This research evaluated the sorption and desorption of hexazinone and diuron applied alone and in mixture, in two samples of Red-Yellow Latosols (LVAG and LVAV) and a Organosol (OR), with and without manure. Sorption isotherms were built using the batch equilibrium method and the identification and quantification of herbicides was obtained through a high-performance liquid chromatography (HPLC) with UV-Vis detector. There were high diuron sorption coefficients (Kf) in the soils. The hexazinone Kf values found were low in LVAG and LVAV soils, and they were high ground only in OR. In all soils, diuron and hexazinone showed higher Kf values when mixed. There was a direct relation between the addition of manure to the substrate and the Kf values . Higher desorption values (Kfd) in relation to those of sorption in LVAG and LVAV soils indicate gradual release of these herbicides in the soil solution when using organic fertilizer, showing increased sorption and desorption of these molecules; this is accentuated when they are mixed. In the Organosol, desorption was very low, and cannot be quantitated by the used method. It is possible to conclude that the incubation of LVAG and LVAV soil with manure helps both the process of sorption and desorption of herbicides. However, sorption and desorption in the Organosol is high indicating very low agrochemicals such strong bonds with soil colloids.

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