Hanna Instruments HI 83214 - Manual (Page 22)

22
Ammonia HR
AMMONIA HIGH RANGE
SPECIFICATIONS
Range 0 to 100 mg/L (as NH
3
-N)
Resolution 1 mg/L
Accuracy ±1 mg/L or ±5 % of reading @ 25 °C, whichever is greater
Light Source Tungsten lamp with narrow band interference filter @ 420 nm
Method Adaptation of the ASTM Manual of Water and Environmental Technology, D1426-92,
Nessler method. The reaction between ammonia and reagents causes a yellow tint in
the sample.
REQUIRED REAGENTS
Code Description Q.ty/test Q.ty/set
HI 93764B-0* Reagent Vial 1 vial 25 vials
HI 93764-0 Nessler Reagent 4 drops 1 bottle
* Reagent Vial identification: A HR, green label.
Note: Store the unused vials in their container in a cool and dark place.
REAGENT SET
HI 93764B-25 Reagents for 25 tests
For other accessories see page 68.
MEASUREMENT PROCEDURE
• Select Ammonia HR method following one of the procedures described in the “Method Selection” section
(see page 15).
• Remove the cap from a Reagent Vial.
• Add exactly 1.0 mL of sample to the vial, while keeping the
vial at a 45-degree angle.
• Replace the cap and mix by inverting the vial a couple of times. This is the blank.
• Place the vial into the holder and push it completely down.