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Torrent Chimica Organica Brown F



the relationship of p with the p fractions of the tc and tio were observed to be positive only in the bi soil, which again corroborates the conclusion that the mineralogical composition of these fractions exerts a more important influence on p adsorption than the fraction of organic matter that they contain. the results of a stratigraphy analysis using inductively coupled plasma-mass spectrometry (icp-ms) on the fraction of p that remained adsorbed to each type of soil confirmed that the clay fraction of the tc was more related to p adsorption than the tio fraction. it is important to emphasize that the amount of mineral fraction deposited at a depth of 0.00-0.20 m is the primary mediator of p adsorption.




Torrent Chimica Organica Brown F



a second mechanism of p adsorption is related to p in solution, which is generally related to the presence of ca, mg, hco3 -, k+, and organic substances. the most common mechanism in soils of retaining p in solution is the occlusion of p by ca and mg (p p p = 0.0066).


matric cation exchange capacity (cec) is a measure of the exchangeable cation exchange capacity of a soil or soil-like material. it is a function of both soil type and degree of weathering, and is related to the fine-grained nature of the mineral matrix of the soil. the amount of aqueous exchangeable cation as measured by cec may determine the binding characteristics of a soil. (rutherford; wang, 1999). in this work, the effect of the weathering reaction during the biogeochemical cycle (harrison-wong; selmans, 1995; safford; barbarella, 1990) on the soil cation exchange capacity was evaluated. weathering leads to a decrease in the k + ca content of the soil, which then increases the soil acidity and affects the pb sorption capacity of a soil (matera et al., 2013; nikolawicz, 2001; senna et al., 2006; spagnola, 1985). the results revealed a positive correlation (r = 0.9883) between the ni-pb adsorption maxima and the cec (matera et al., 2013). however, no evident correlation was found between the cec and the ni-pb adsorption capacity (r = 0.1904). the low soil cec reported in the present study was likely due to the low ph of soils (around 5.5) compared to those studied in the literature (around 8) (belt; wilkinson, 2006; prince; wilkinson, 1974). similar results were observed in a study carried out by matera et al. (2013) in sicily where the soil ph was 6.5, which points to ph as a key factor to determine soil erosion by siltation in mediterranean areas.


https://www.interativadovale.com/group/pt-lula-2023/discussion/a672799a-530e-458f-9196-6a74e0fad2d3

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