Hach DR2400 - Page 376

Mercury
Mercury
Page 4 of 12
Mercury_PP_Other_CVM_Eng_Ody.fm
5. Connect the power to
the vacuum pump and
apply vacuum to the
Mercury Absorber
Column. Draw most of
the HgEx Reagent B into
the Erlenmeyer flask.
6. Disconnect the
vacuum using the quick
disconnect when
HgEx Reagent B begins
to drip from the inner
delivery tube on the
Mercury Absorber
Column (about
10 seconds after starting
the vacuum). Do not
draw enough air through
the column to begin
drying the packing.
7. Remove the 100-mL
Erlenmeyer flask from
the Mercury Absorber
Column. Replace it with
the 10-mL Distilling
Receiver.
8. Pipet 2 mL of HgEx
Reagent C into the
Mercury Absorber
Column.
9. Connect the Mercury
Absorber column to the
Gas Washing Bottle using
the glass elbow.
10. Shake an ampule of
HgEx Reagent A to
suspend undissolved
reagent.
Open the ampule and
gently shake the contents
into the Gas Washing
Bottle through the side
neck.
11. Stopper the side neck
on the Glass Washing
Bottle.
12. Reconnect the
vacuum to the Mercury
Absorber Column using
the quick disconnect. The
vacuum will pull HgEx
Reagent C through the
Mercury Absorber
Column packing and into
the 10-mL receiver. Air
bubbles should be
produced at the gas
dispersion tube in the
Gas Washing Bottle.
Perform steps 13–14
immediately.