Pedotransfer functions of potentially toxic elements in tropical soils cultivated with vegetable crops

Abstract

The anthropogenic input of potentially toxic elements (PTEs) from industry, agrochemicals, etc., into the environment are of great concern. Models derived from pedotransfer functions can provide estimates of the levels of PTEs based on soil attributes. Based on the importance of these models in studies in contaminated areas, we assessed the concentrations of the reactive contents of Ba, Cu, Cr, Ni, Pb, and Zn in soils cultivated with vegetable crops in the state of São Paulo, Brazil. We also evaluated the influence of chemical and physical soil attributes on their reactivity and availability. The reactive contents of PTEs represent the fraction of PTEs easily sorbed at the adsorptions sites of organic matter, iron hydroxides, or clay. This fraction can supply information about the PTE content that is more or less readily released into the soil solution. The reactive and available fraction was extracted with 0.43 M HNO and 0.01 M CaCl, respectively. The proportion of reactivity of metal pools decreased in the order of Ba>Zn > Cu > Pb > Ni > Cr. The empirical models were able to predict the relationship between the reactive fractions, the pseudototal content, and the soil attributes. The available concentrations of Cr, Cu, Ni, and Pb in the soils were lower than the limit of quantification, while 3% of the Ba content and 1% of the Zn content were available in the soil solution in relation to their pseudototal content, suggesting low mobility of these elements in the soil.

Cu and As(V) Adsorption and Desorption on/from Different Soils and Bio-Adsorbents

“…According to Boim et al [ 64 ], the decrease in Cu mobility as pH increases is due to the formation of insoluble complexes, and they also highlight the importance of non-crystalline Fe and Al oxy-hydroxides in the adsorption of Cu 2+ . In a study carried out on vineyard soils amended with mussel shell [ 65 ], a decrease in the available Cu was observed, which was related to the increase in soil pH, although it could also be affected by the direct adsorption of Cu onto the added mussel shell [ 66 ].…”

Pedotransfer Function to Estimate the Soil Structural “S” Index and Spatial Variability in an Oxisol Within a Livestock Farming System

“…In addition, it may be possible to estimate the S index by pedotransfer functions, as reported by Xu et al (2017); thus, the index could be determined and mapped using soil attributes that are easier to determine. In Boim et al (2018), the authors used multiple linear regression (MLR) techniques in a pedotransfer function to estimate the reactive fractions and the availability of Ca, Cr, Cu, Ni, Pb, and Zn in soils cultivated with vegetables in São Paulo, Brazil. Rodríguez-Lado & Martínez-Cortizas (2015) evaluated the performance of MLR, a random forest algorithm, and artificial neural networks for estimating the spatial variability in the soil bulk density measurements using organic carbon and soil particle size fractions.…”

Human bioaccessibility and absorption by intestinal cells of potentially harmful elements from urban environmental matrices

“…A solution of 0.43 mol L -1 HNO 3 was used to extract the reactive concentration of PHE (Rodrigues et al, 2012;Groenenberg et al, 2017;Boim et al, 2018). For this purpose, 5.0 g of soil was weighed in polypropylene flasks, and then 50 mL of 0.43 mol L -1 HNO 3 were added.…”