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CH3041
MERCURY II
• Speciation
is important in mercury as there
are the 3 different oxidation states available.
are the 3 different oxidation states available.
• Hg2+ is the common form and often Hg2+ is
bound to sulphur or oxygen. eg. HgS, HgO
bound to sulphur or oxygen. eg. HgS, HgO
• Reduction of Hg2+ under anaerobic conditions
may form Hg metal.
• Mercury is used in batteries (30%), street
lamps, switches and fungicides.
lamps, switches and fungicides.
Mercury analyses
are difficult (cold vapour AA) atomic fluoresence spectroscopy,it is easy to
lose Hg in the vapour phase and it has a tendency to adsorb on
glass.
• Treatment in the sample container with
K2Cr2O7/HNO3 prevents container losses.
K2Cr2O7/HNO3 prevents container losses.
