Artículo de revista
Released fraction of polychlorinated biphenyls from soil–biosolid system using a leaching procedure and its comparison with bioavailable fraction determined by wheat plant uptake
Fecha
2017Registro en:
Environ Sci Pollut Res (2017) 24:25092–25102
10.1007/s11356-017-0176-y
Autor
Jachero, Lourdes
Claudio, Leiva
Ahumada Torres, Aída Inés
Richter Duk, Pablo
Institución
Resumen
The bioavailability of polychlorinated biphenyls
(PCBs) in soils amended with biosolids was estimated using
an aqueous leaching process of the compounds combined with
rotating disk sorptive extraction (RDSE), and compared with
bioavailability determined through of PCB absorption in
wheat plants growing in the same soil–biosolid matrix. The
matrices consisted of soil amended with biosolids at doses of
30, 90, and 200 Mg/ha, which increase concomitantly the
organic matter content of the matrix. Considering that PCBs
were natively absent in both the biosolids and soil used, the
compounds were spiked in the biosolids and aged for 10 days.
For each biosolid dose, the aqueous leaching profile was studied
and equilibrium time was calculated to be 33 h. The
leaching fractions determined by RDSE, considering total
PCBs studied, were 12, 7, and 6% and the bioavailable fractions
absorbed by the wheat root were found to be 0.5, 0.3, and
0.2% for 30, 90, and 200 Mg/ha doses, respectively. Both
fractions leachable and bioavailable decrease with both increasing
hydrophobicity of the compound (Kow) and increasing
in the biosolid dose. It was found that both fractions
(leaching and bioavailable) correlated according to the bivariate
least squares regression, represented by a coefficient of
correlation of 0.86. Therefore, the application of the chemical
method involving a leaching procedure is an alternative to estimate the bioavailable fraction of PCBs in wheat plants in
a simpler and in a shorter time.