YSI pHotoFlex Series - Manual (Page 20)

20 ba76126e01 03/2013
Note: Before using the test with your photometer for the first time, determine the reagent blank
value.
YSI model no.: NH4-1 TP
Category: RT (reagent test)
Cell: 28 mm
Measuring range: 0.01 - 0.50 mg/l NH
4
-N
0.01 - 0.64 mg/l NH
4
Display in mmol/l possible
Pipette 10.0 ml of sample
into the empty cell. Add the contents of a
VARIO AMMONIA
Salicylate F10 powder
pack and close the cell
with the screw cap. Allow to react for 3
minutes (reaction time). Add the contents of a
VARIO AMMONIA
Cyanurate F10 powder
pack and close the cell
with the screw cap. Shake the cell vigorously
to dissolve solids.
Allow to react for 15
minutes (reaction time). Insert the cell in the
photometer cell shaft
and start measurement.
Notes:
• We recommend to determine a new reagent blank value (deionized water instead of sample) for each test package started.
• If NH
4
-N is present in the sample, the solution becomes green after VARIO AMMONIA Cyanurate F10 was added.
• If chlorine is present, sodium thiosulfate has to be added to the sample immediately after sampling. Add 1 drop of a 0.1
mol/l sodium thiosulfate solution per 0.3 mg/l chlorine to 1 liter sample.
3:00
15:00
Ammonium vario
Program no.
324
*RN324*