02380naa a2200337 a 450000100080000000500110000800800410001902200140006002400590007410000170013324501440015026000090029452013870030365000190169065000180170965000230172765000180175065000160176865000190178465000200180365000180182365000220184165300170186365300190188070000220189970000220192170000220194370000160196570000200198177300410200120808782022-08-10       2018    bl uuuu     u00u1 u    #d  a0045-65357 ahttps://doi.org/10.1016/j.chemosphere.2017.10.1122DOI1 aBORBA, R. P.  aIon leaching and soil solution acidification in a vadose zone under soil treated with sewage sludge for agriculture.h[electronic resource]  c2018  aIn this study, we performed monitoring of the soil solution (SS) over 10 years on a loamy/clayey-textured Dark Red Dystroferric Oxisol that received sewage sludge for agricultural purposes. The SS was obtained by lysimeters installed along the walls of a well at 1 m, 2 m, 3 m, 4 m and 5 m in depth. The major ions found in the SS were NO3-, SO42-, Cl-, Ca2+, Mg2+, Al3+, Pb2+, Cd2+ and Zn2+, and the pH level ranged from 4 to 6.5 along the profile. Throughout the first three years of monitoring, the pH to a 3-m depth became more acidic, and in the last year, this trend reached 5 m. At the 5-m depth, the pH decreased from 6.5 to 4.5 from the first to the last monitoring. The SS acidification was provoked by both nitrite oxidation and ion leaching. The leaching of H+ or the possible ion exchange/desorption of H+ due to the leached cations (Ca2+ and Mg2+) at the 4-m and 5-m depth caused the pH decrease. The ionic strength (IS) of the solution controlled the ion leaching. The sludge application increased the IS to 3 m, increasing the density of the soil charges and its ability to absorb ions. After the sludge application was completed, there was a decrease in IS of the SS as well as a decrease in ion absorption and retention abilities, which promoted leaching to greater depths. During the entire monitoring process, NO3-, Cd and Pb remained above the potability limit.  aIonic strength  aSewage sludge  aSoil acidification  aSoil solution  aVadose zone  aAcidificação  aAdubo de esgoto  aLodo residual  aSolução do solo  aIon leaching  aLodo de esgoto1 aRIBEIRINHO, V. S.1 aCAMARGO, O. A. de1 aANDRADE, C. A. de1 aKIRA, C. S.1 aCOSCIONE, A. R.  tChemospheregv. 192, p. 81-89, 2018.