COMPARATIVE STUDY OF WET DIGESTION METHODS OF SAMPLE PREPARATION FOR ELEMENTAL ANALYSIS.
COMPARATIVE STUDY OF WET DIGESTION METHODS OF SAMPLE PREPARATION FOR ELEMENTAL ANALYSIS.
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Date
1984-02
Authors
AJIBOLA, VICTOR OLATUNJI
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Abstract
Nine wet digestion methods were used on two guava samples and eight
tomatoe samples for the purpose of elemental determination. These samples
"belong to the group of fruity vegetables. Acid and acid mixtures were
used to digest the samples; these include HNO3., HNO3/H2SO4, , HNO3/HC104,
HN03/HC104/H2S04 , HN03/NH4 N03, and HCl/HNO3. Selenium was used as
a catalyst in one of the procedures. Eleven metals were determined.
These are sodium, potassium, calcium, magnesium, iron, zinc, copper,
manganese, lead, cobalt, and cadmium. Atomic Absorption
spectrophotometry and flame photometry were used to determine the metals.
The reliability of each digestion method, for the determination of
each, metal in each sample was assessed, by calculating the mean and
standard deviation, and by performing the multiple range tests on the
result of each method.
It was found that, no one single method of digestion could release
all the metals of interest quantitatively and reliably from each sample.
A minimum of three digestion methods for each sample was found tt be
needed for the determination of these metals, each method being reliable
for a group of metals. Some methods such as these involving the use of
perchloric acid in the digestion mixture and those using nitric acid
alone were found to lead to partial or total losses in certain trace
elements like Co, Cd and Pb. The three most valuable digestion methods
that are recommended for the types of biological samples studied are
method A (H2SO4/HNO3), method B (modification of A), method F
(HNO3/NH4N03).
Description
A thesis submitted to the Postgraduate School,
Ahmadu Bello University, in partial fulfilment
of the requirements for the degree of MASTER
OF SCIENCE IN ANALYTICAL CHEMISTRY
Department of Chemistry
Faculty of Science,
Ahmadu Bello University,
Zaria.
Keywords
WET DIGESTION,, ELEMENTAL ANALYSIS,