User Manual

88 89
Nitrate
SPECIFICATIONS
Range 0.0 to 30.0 mg/L
Resolution 0.1 mg/L
Accuracy ±0.5 mg/L ±10% of reading at 25 °C
Typical EMC ±0.1 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 525 nm
Method Adaptation of the cadmium reduction method. The reaction between nitrate and the
reagent causes an amber tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93728-0 Powder reagent 1 packet
REAGENT SETS
HI 93728-01 Reagents for 100 tests
HI 93728-03 Reagents for 300 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
Select the
Nitrate
method using the procedure described in the
Method Selection
section (see page 12).
Using the pipette, fill the cuvette with 6 ml of sample, up to
half of its height, and replace the cap.
Place the cuvette into the holder and close the lid.
Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
Remove the cuvette and add the content of one packet of HI 93728-0
reagent.
NITRATE
INTERFERENCES
Interference may be caused by:
Co
2+
must not be present
Fe
2+
must not be present
Al
3+
above 32 mg/L
Ca
2+
above 1000 mg/L (as CaCO
3
)
Cd
2+
above 20 mg/L
Cl¯ above 8000 mg/L
Cr
3+
above 20 mg/L
Cr
6+
above 40 mg/L
Cu
2+
above 15 mg/L
F¯ above 20 mg/L
Fe
3+
above 10 mg/L
K
+
above 500 mg/L
Mg
2+
above 400 mg/L
Mn
2+
above 25 mg/L
Mo
6+
above 60 mg/L
Na
+
above 5000 mg/L
Pb
2+
above 20 mg/L
Zn
2+
above 30 mg/L
Nickel LR
6 mL