Camlab Lovibond MD 610, Instruction Manual

Page: 204 / 371

198
MD 610_2d 11/2019
Notes:
1. Appropriate safety precautions and a good lab technique should be used during the
whole procedure.
2. Usea funnel to add the reagent.
3. Wipe off any Persulfatereagent that may get on the lid or the tube threads.
4. Nitrogen, total LR:
Volumes for samplesand blank should always be metered by using 2 ml volumetric
pipettes (classA).
Nitrogen, total HR:
Volumes for samplesand blank should always be metered by using suitable pipettes
(class A).
5. One blank is sufficient for each set of samples.
6. The reagent may not dissolve completely.
7. It is very important to remove the vials from the reactor after exactly 30 minutes.
8. The reagent will not completely dissolve.
9. Hold the vial in a vertical position with the cap pointing up. Turn the vial upside-down.
Wait for all of the solution to flow down to the cap. Return the vial to the upright
position. Wait for all the solution to flow to the bottom of the vial. Thisprocessis one
inversion; 10 inversions = approx. 30 seconds.
10. The zero (stored in the dark) can be used for 7 days, if the measured sampleswere
prepared with the same batch of reagent.
11. Large quantities of nitrogen free, organic compounds which are included in some
water samplesmay reduce the effectiveness of the digestion by reacting with the
Persulfate reagent. Sampleswhich are well known to contents large quantities of
organic compounds must be diluted and digestion and measurement must be repeated
for checking the effectivenessof the digestion.
12. Application: for water, wastewater and seawater
13. Interferences:
Interfering substancesthat resulted in a concentration change of 10%:
Bromide more than 60 mg/l and Chloride more than 1000 mg/l produce positive
interferences.
TN = Total Nitrogen
14. N
NH
4
NH
3