Organic matter effects on the Cr(VI) removal efficiency and tolerance of Typha domingensis.

MUFARREGE, M. M.; SANCHEZ, G. C.; PEDRO, M. C.; HADAD, H. R.; MAINE, M. A.; DI LUCA, G. A.; CAFFARATTI, S. E.

WATER AIR AND SOIL POLLUTION

SPRINGER

Lugar: Berlin; Año: 2018 vol. 229

0049-6979

The removal efficiency and tolerance ofTypha domingensis to Cr(VI) in treatments with andwithout organic matter (OM) addition were evaluatedin microcosm-scale wetlands. Studied Cr(VI) concentrationswere 15 mg L−1, 30mg L−1, and 100mg L−1, intreatments with and without OM addition, arranged intriplicate. Controls (without neither metal nor OMaddition?without metal with OM addition) were disposed.Cr(VI) was removed efficiently from water in alltreatments. OM addition enhanced significantlyCr(VI) and total Cr removals from water. In thetreatments with OM addition, significantly higherCr concentrations were found in sediment than thetreatments without OM addition. Plants of the treatmentswithout OM addition showed significantlyhigher Cr concentrations in tissues but lower biomassincrease than the treatments with OM addition. Thehighest Cr concentrations in tissues were observed insubmerged parts of leaves, followed by roots. Accordingto SEM analysis, in the 100 mg L−1 treatments,the highest Cr accumulation was observed inthe epidermis of old leaves. Although Cr(VI) producedchanges in root morphology, the OM additionfavored the plant growth. In T. domingensis, rootmorphological plasticity is an important mechanismto improve metal tolerance and Cr uptake in wetlandsystems minimizing the environmental impact.