ANALYSIS OF NATURALLY OCCURRING WATERS FOR TOXIC METALS
ANALYSIS OF NATURALLY OCCURRING WATERS FOR TOXIC METALS
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Date
2015-04-20
Authors
PAUL, UKO ANYOGO
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Abstract
c metals. The metals are cadmium, cobalt, copper, lead
manganese and zinc. The analytical technique used here is
a combination of methods recommended by APHA-AWWA-WPCF1 and
Reynolds and Aldous.2 The samples were acidified with
5.0cm3 conc. HNO3 per litre of sample, immediately after
collection. At the time of analysis, they were acidified
with 1:1 redistilled HC1 heated for a given time on a
steambath, cooled and filtered.
The analysis was done in two parts. In each case,
100.0 cm3 of samples were used. In the first part, the
metal ions were chelated with APDC and extracted into MIBK
at a given pH. The organic extracts were aspirated into
an air-acetylene flame in AAS at the resonance wavelength
of the metal. Already, analytical curves for the metals
were prepared by extracting each metal from a solution of
known concentration, determining their absorbances in AAS
and plotting the same against concentrations. From these
standard curves, the concentration of each metal in the
water samples were determined,
In the second part of that analysis, the same metals were chelated with sodium diethyldithiocarbamate and
extracted into chloroform. The absorbances of the extracts
were determined with a UV spectrophotometer and the
concentrations were again determined from their Calibration
Curves.
The results of these methods are a measure of the
extractable metals in the water samples. Finally, the
two methods of analysis are compared.
Description
A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF
THE REQUIREMENTS FOR THE AWARD OF MASTER OF
SCIENCE IN ANALYTICAL CHEMISTRY
BY
MR PAUL UKO ANYOGO B.Sc (Hons.) CHEMISTRY
DEPARTMENT OF CHEMISTRY
AHMADU BELLO UNIVERSITY
ZARIA
Keywords
ANALYSIS,, NATURALLY,, OCCURRING,, WATERS F,, TOXIC METALS