Abstract

MARTINEZ ROBAINA., Alexei Yoan et al. Fractionation of heavy metals in soils grown with tobacco in Pinar del Río, Cuba. Acta Agron. [online]. 2020, vol.69, n.3, pp.203-211.  Epub Aug 24, 2021. ISSN 0120-2812.  https://doi.org/10.15446/acag.v69n3.81471.

Knowledge of heavy metals presence in agricultural soils is important to prevent accumulation in cultivated plants. The objective of this research was to evaluate the total concentrations and fractions of the heavy metals Cd, Pb, Zn, Fe, Mn, Ni, Cu, Cr and Co from Pinar del Río, Cuba, tobacco crop and their relationship with soil physicochemical properties. For the study, 59 samples of three types of soils were collected at 20 cm depth. The pseudo-total concentrations of the metals in the soils are low and lower than the prevention values registered for Cuban soils. In general, heavy metals studied have a high affinity for the most stable fractions of the soil, which means a low risk of transfer to tobacco cultivation or accumulation in groundwater. Pseudo-total concentrations of heavy metals were low, below the alert values established for soils in the region. Assessed heavy metals were mainly associated with a residual fraction, the second fraction with the highest association with metals was that linked to manganese and iron oxides. The principal component analysis showed that its main source of origin is pedogenetics and that these elements are closely related to cation exchange capacity and calcium content.

Keywords : availability; fractionation; heavy metals; soil; tobacco.

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