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Abstract
In this study, 8-Hydroxyquinoline (8-HQ) strategy was utilized
to extract heavy metals in estuarine water . The concentrated
sample was then further analyzed for Cu, Cd by Graphite atomic
absorption spectrometry (GAAS). After characterized the
synthesized 8-HQ, it found that 8-HQ chelating agent possesses
high stability against the fluctuation of the pH value and it
will not lose its chelating ability while it was exposed to the
testing environment. The optimized working condition of 8-HQ for
extraction hey metals in estuarine water was determined by
factors including the flowing rate of water sample through 8-HQ
as well as the different ratio of HNO3 and HCl contracted acid.
When all these factors were determined and then combined, the
right procedure for analyzing trace metals in estuarine water
was found.
Calibrating GAAS experiment in the Zeeman back-ground, finding
the correct temperature program for detecting the amount of
heavy metals could be simply achieved by changing the
temperatures of the four steps of the heating processes(drying,
ashing, atomization, cleaning, respectively). Furthermore,
adding modifier such as Mg(NO3)2 or Pd-Mg could increase the
temperature of ashing step leading to the elimination of any
undesired materials in the sample. With these modified steps,
all metals could be detectedhile their atomization process takes
place.
The analyzing method combined GAAS and 8-HQ is not only on the
study of trace metals in estuarine water but also on the
determination in sea water. So the method provide great
potential in coastal estuarine water pollution prevention
especially in detecting the existence of heavy metals which is
harmful to human.
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