Lake water samples were collected in polypropylene bottles
from Lake Furnas, Minas Gerais State, Brazil. In order to preserve
the sample, three drops of concentrated nitric acid were added for
each 100 mL of water. Afterwards, the samples were filtered under
vacuum using 0.45 m cellulose acetate membranes and 10.0 mL
of sample was added into the electrochemical cell and the volume
was made up to 10.75 mL after adding 750 L of 4.0 mol L−1 acetate
buffer solution at pH 3.6. Aqueous effluent samples were collected
from a textile industry located at Alfenas, Minas Gerais State, Brazil.
Aliquots of 100 mL of samples were collected in polypropylene bottles
at the outlet of the Parshall Gutter from the effluent treatment
plant. A total of 10 aliquots were taken in order to guarantee the
representation of the samples. These collected samples were acidified,
stored in a freezer and analysed in similar way to lake water,
but without the filtering procedure.
Lake water samples were collected in polypropylene bottlesfrom Lake Furnas, Minas Gerais State, Brazil. In order to preservethe sample, three drops of concentrated nitric acid were added foreach 100 mL of water. Afterwards, the samples were filtered undervacuum using 0.45 m cellulose acetate membranes and 10.0 mLof sample was added into the electrochemical cell and the volumewas made up to 10.75 mL after adding 750 L of 4.0 mol L−1 acetatebuffer solution at pH 3.6. Aqueous effluent samples were collectedfrom a textile industry located at Alfenas, Minas Gerais State, Brazil.Aliquots of 100 mL of samples were collected in polypropylene bottlesat the outlet of the Parshall Gutter from the effluent treatmentplant. A total of 10 aliquots were taken in order to guarantee therepresentation of the samples. These collected samples were acidified,stored in a freezer and analysed in similar way to lake water,but without the filtering procedure.
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