Mercury
Mercury
Mercury_PP_Other_CVM_Eng_Ody.fm Page 3 of 12
9. Return the cool,
digested sample to the
cool, magnetic stirring
hot plate. Turn on the
stirrer.
10. Using a 0.5-g
measuring spoon, add
0.5 g additions of
hydroxylamine-
hydrochloride until the
purple color disappears.
Wait 30 seconds after
each addition to see if the
purple disappears. Add
hydroxylamine-
hydrochloride until all
manganese dioxide is
dissolved.
11. Remove the stir bar. 12. The digested sample
is now ready for
processing by cold vapor
separation and
preconcentration.
Proceed to Phase 2.
1. Transfer the digested
sample to the Cold Vapor
Gas Washing Bottle. (The
volume of the digested
sample should contain
0.1 to 2.5 µg Hg.)
2. Set the Gas Washing
Bottle in the support ring.
Place the top on the Gas
Washing Bottle. Wait
until step 9 to connect the
mercury absorber column
to the Gas Washing
Bottle.
3. Connect the 100-mL
Erlenmeyer flask to the
mercury absorber
column.
4. Pipet 8 mL of
HgEx Reagent B into the
Mercury Absorber
column.
10 mL
Phase 2: Cold Vapor Separation and Preconcentration of Mercury
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