PRELIMINARY ESSAY ON THE EFFECT OF ENVIRONMENTAL FACTORS ON Cr (VI) REMOVAL BY Salvinia minima IN A LONG-TERM TREATMENT

CHOCOBAR PONCE, SILVANA; PRADO, CAROLINA; MADRID, SOFIA; PRADO, FERNANDO; ROSA, MARIANA

Tucumán

Jornada; XXXIV Jornadas Científicas Asociación de Biología de Tucumán; 2017

ABT

Environmental contamination by heavy metals is an often studied problem due to the toxicity of those metals. One option for the cleaningof polluted environments is the use of heavy-metal-resistant plants, so their study is necessary to achieve efficient, economical andenvironmentally friendly removal technologies. The objective of this work was to evaluate the removal of Cr(VI) by Salvinia minima in along-term treatment under uncontrolled conditions. The essay was conducted outdoors for one month. S. minima plants were placed undercontrol conditions in running water and with 20 mg / L of K2CrO7. The remaining Cr in water was determined every 2 days using DFC.The pH and temperature of the treatment solution were measured and tissue damage was estimated on day 31.The results showed that untilday 4 the removal of more than 40% of the metal took place, after which the process slowed down and at the end of the test it showed 60%removal. Plants subjected to Cr(VI) showed greater tissue damage than control plants and an evident deterioration. The pH followed apattern similar to the remaining Cr in the solution and in the controls. Temperature gradually declined throughout the treatment. It isconcluded that S. minima can remove most of the Cr from the solution in 4 days of treatment, but temperature decrease slows down thisprocess. The presence of S. minima alone and in combination with C(VI) altered the pH in the medium, which could be a consequence ofthe decrease of Cr in the solution and / or some process mediated by the laciniae.