194
MD 610_2d 11/2019
Nitrogen, total LR
with Vario Tube Test
0.5 – 25 mg/l N
Insert the adapter for 16 mm Ø vials.
1.
Open two TN Hydroxide LRdigestion vials
and add
the contentsof
one Vario TN Persulfate Rgt. Powder
Pack
(Note 2, 3).
2.
Add
2 ml deionised water
to the preparedvial (thisis
the blank, Note 4, 5).
3.
Add
2 ml of the water sample
to theother preparedvial
(this is the sample).
4. Close the vials with
the caps and shake to mix the
contents (at least 30 seconds, Note 6).
5.
Heat the vialsfor
30 minutes
in the preheated reactor
at a temperature of
100°C
(Note 7).
6. After
30 minutes remove the vials from the reactor.
(CAUTION: The vials are hot!)
Allow the vials to cool to room temperature.
7.
Open the cooled digestion vialsand add the contentsof
one
Vario TN Reagent A Powder Pack
to each vial (Note 2).
8. Close the vials with
the caps and shake to mix the
contents (at least 15 seconds).
9. Press
[
]
key.
Wait for a
reaction period of 3 minutes.
After the reaction period is finished proceed as follows:
10. Open the digestion vials and add the contents of
one
Vario TN Reagent B Powder Pack
to each vial (Note 2).
11. Close the vials with the caps and shake to mix the
contents (at least 15 seconds, Note 8).
Countdown
3:00
start:
1
2
3
4
Ø 16 mm
8
0
2
Summary of Contents for Lovibond MD 610
Page 14: ...8 MD 610_2d 11 2019...
Page 15: ...9 MD 610_2d 11 2019 Part 1 Methods...
Page 87: ...81 MD 610_2d 11 2019...
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Page 306: ...300 MD 610_2d 11 2019...
Page 307: ...301 MD 610_2d 11 2019 Part 2 Instrument Manual...
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