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Photometric Determination Of Nitrate; Photometric Determination Of Nitrite; Photometric Determination Of Ammonium - MACHEREY-NAGEL VISOCOLOR Manual

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Manual VISOCOLOR

3.3 Photometric determination of nitrate

Procedure with PF-3:
Measurement of nitrate nitrogen with reagent set VISOCOLOR
ECO nitrate and the PF-3:
Zero measurement with sample. Rinse test tube (51) and add
5 mL water sample using the plastic syringe (13). Add 5 drops
NO
-1 (45) seal the glass and shake. Add 1 level measuring
3
spoon of NO
-2 (46), seal the glass and shake well for 1 min.
3
Clean outside of test tube and measure after 5 min with the PF-3
(40).
1
2
3
4
5
ml
NO
-1
3
51
13
45
Preprogrammed submethods:
Wavelength:
450 nm
Method 5411
1.0–14.0 mg/L NO
Method 5412
4–60 mg/L NO
Method 5416
2–28 mg N/kg soil
Measurement of nitrate nitrogen with reagent set NANOCOLOR
Nitrate 50 (REF 985064) and the PF-3:
Follow the instructions enclosed in the reagent set. In case of col-
ored or turbid solutions prepare a blank value by adding 0.5 mL
soil extract AF and 0.5 mL dist. water to a test tube.
Preprogrammed submethods:
Wavelength:
365 nm
Method 0641
0.3–22.0 mg/L NO
Method 0642
2–100 mg/L NO
Method 0644
1–44 mg N/kg soil
Procedure with further NANOCOLOR
Measurement of nitrate nitrogen with reagent set NANOCOLOR
Nitrate 50 (REF 985064):
Follow the instructions enclosed in the reagent set. In case of
colored or turbid solutions prepare a correction value by adding
0.5 mL soil extract AF and 0.5 mL dist. water to an empty test
tube and use the correction value function in the NANOCOLOR
photometer (see manual).
Preprogrammed NANOCOLOR
® UV
UV
NANOCOLOR
/
,
/
VIS
VIS
Plus
PF-12
, PF-12
Wavelength
365 / 385 nm
Method
0644 1–44 mg N/kg soil
Method
0645 4.5–200 kg N/ha soil
Other photometers
Wavelength
365 / 385 nm
Multiply displayed result in mg/L with 2:
1–44 mg N/kg soil
Multiply displayed result in mg/L with 9:
4.5–200 kg N/ha soil
28
®
reagent case for soil analysis
NO
-2
3
Neumann-Neander-Str.6–8·52355Düren
Germany·Tel.:+492421969-0
46
40
-N
3
3
-N
3
3
®
photometers
®
photometers
II, VIS, VIS II, 500 D, 400 D,

3.4 Photometric determination of nitrite

Measurement of nitrite nitrogen with reagent set NANOCOLOR
Nitrite 2 (REF 985068):
®
Follow the instructions enclosed in the reagent set.
Preprogrammed photometers
® UV
NANOCOLOR
/
VIS
Plus
PF-12
, PF-12
Wavelength
Method (0)683
Other photometers
Wavelength
Multiply displayed result in mg/L N with 2:

3.5 Photometric determination of ammonium

Procedure with PF-3:
Measurement of ammonium with reagent set VISOCOLOR
ECO Ammonium 3 and the PF-3:
Zero measurement with sample. Rinse test tube (51) and add
5 mL water sample using the plastic syringe (13). Add 10 drops
NH
-1 (42) seal the glass and shake. Add 1 level measuring
4
spoon of NH
-2 (43) seal the glass and shake the mixture until
4
the powder has dissolved.Wait for 5 min. Add 4 drops NH
Seal the glass and shake. Clean outside of test tube and mea-
sure after 5 min with the PF-3 (40).
®
1
2
3
4
5
ml
N H
- 1 N H
4
51
13
42
Preprogrammed submethods:
Wavelength:
®
Method 5081
Method 5082
Method 5086
Measurement of ammonium nitrogen with the reagent sets
®
NANOCOLOR
Ammonium 3 / 10 / 50 (REF 985003 / 985004 /
®
985005) and the PF-3:
Follow the instructions enclosed in the reagent set. If soil extract
AF is turbid, it must be filtered with a 0.45 μm membrane filter
(REF 91650) prior to analysis. The selection of the test depends
on the ammonium content to be expected. For higher contents,
use the test 0–05, for lower levels test 0–04.
®
Manual VISOCOLOR
reagent case for soil analysis 02.19
UV
,
/
II, VIS, VIS II, 500 D, 400 D,
VIS
540 nm
0.02–0.9 mg N/kg soil
540 nm
0.02–0.9 mg N/kg soil
- 2 N H
- 3
4
4
43
44
40
660 nm
0.1–2.0 mg/L NH
-N
4
0.1–2.5 mg/L NH
4
0.2–4.0 mg N/kg soil
®
®
-3 (44).
4

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