User Guide

37
NITROGEN, TOTAL LOW RANGE
SPECIFICATIONS
Range 0.0 to 25.0 mg/L
Resolution 0.1 mg/L
Precision ±0.5 @ 15.0 mg/L
Typical EMC ±0.1 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter
@ 420 nm
Method Chromotropic acid method. A persulfate digestion
converts all forms of nitrogen to nitrate. Then the
reaction between nitrate and the reagents causes
a yellow tint in the sample.
REQUIRED REAGENTS
Code Description Q.ty/test Q.ty/set
* Digestion Vial 1 vial 50 vials
--- Deionized Water 2 mL 1 bottle
--- Potassium Persulfate 1 packet 50 packets
--- Sodium Metabisulfite 1 packet 50 packets
HI 93767-0 Total Nitrogen Reagent 1 packet 50 packets
** Reagent Vial 1 vial 50 vials
* Digestion Vial identification: N, green cap.
** Reagent Vial identification: N, white cap.
Note: Store the unused vials in their container in a cool and dark place.
REAGENT SET
HI 93767A-50 Reagents for up to 49 tests. Contains:
Box 1: HI 93767A-50 Reagent Set
Box 2: HI 93767A&B-50 Reagent Set, for both
HI 93767A and HI 93767B parameters.
For other accessories see page 77.
REQUIRED ACCESSORIES
C 9800-01 Hanna reactor (115 VAC)
C 9800-02 Hanna reactor (230 VAC)
HI 740216 test tube cooling rack (25 holes)
HI 740217 Laboratory bench safety shield
For other accessories see page 77.
Nitrogen, Total LR
44
• Replace the cap tightly and shake vigorously the vials for about
30 seconds until all the powder is completely dissolved.
• Insert the vials into the reactor and
heat them for 30 minutes at 105°C.
Note: to obtain most accurate results,
it is strongly recommended to remove
the vials frome the reactor after
exactly 30 minutes.
• At the end of the digestion place the
vials carefully in the test tube rack and
allow to cool to room temperature.
Warning: as the vials are still hot, be
careful in handling them.
• Select the program number corresponding to Total Nitrogen HR on the
secondary LCD by pressing PROGRAM t and s.
• Remove the cap from the vials and add the content of one packet
of Sodium Metabisulfite for Total Nitrogen analysis to each vial.
Replace the cap tightly and shake gently the vials for 15 seconds.
• Wait for 3 minutes (without shaking the vials)
to allow the reaction to complete.
Nitrogen, Total HR