INQUISAL   20936
INSTITUTO DE QUIMICA DE SAN LUIS "DR. ROBERTO ANTONIO OLSINA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
ALKALINE AND ACID PHOSPHATASE ACTIVITY IN SOIL TREATED WITH MINING LEACHING SOLUTIONS
Autor/es:
CARRERA, S. E.; MESSINA, G. A.; MARCHEVSKY, E; STEGE, P. W.
Lugar:
Potrero de los Funes
Reunión:
Congreso; XXX Reunión Anual de la Sociedad de Biología de Cuyo; 2012
Resumen:
Mine leaching involves the use of cyanide usually in gold, silver,
and copper ores, which merits great attention because of the serious
environmental and public safety impact. Nowadays, two compounds
capable of complex gold have been proposed to be used in
the leaching process. Those compounds are thiourea and thiocyanate,
which are used mostly as moisture. Phosphatases (phosphoric
monoester hydrolases) are required to mineralize organic P to release
it as specie available for the plants. Microbial phosphatases
are found to be more efficient in hydrolysis of organic P compounds
than the phosphatases of plants. Among the hydrolases, acid phosphomonoesterase
activity is the most frequently used enzyme for
estimating changes in soil quality. These enzymes are classified as
acid phosphatase (AcP) and alkaline phosphatase (AlP) according
to their optimum pH. This enzyme is an important index of the
quality and quantity of organic matter in the soil. The aim was to
measure the changes in the activity of phosphatases exposed to different
concentration of the cyanide, thiourea and tiocianate compounds
at concentration using in a real mining process. Results
were evaluated using c2 test. The AcP and AlP activities were higher
in soils affected by tiourea compared with tiocianate. In soils treated
with cyanide both enzyme activities suffer a significantly decrease.
In all the studies a positive control were represented by a soil with
any disturbance.