YSI pHotoFlex Series - Manual (Page 60)

60 ba76126e01 03/2013
Note: Before using the test with your photometer for the first time, determine the reagent blank
value.
YSI model no.: Si-1 TP (LR)
Category: RT (reagent test)
Cell: 28 mm
Measuring range: 0.01 - 1.60 mg/l SiO
2
0.005 - 0.748 mg/l Si
Display in mmol/l possible
Pipette 10.0 ml of sample
into the empty cell. Add 15 drops of Vario
Molybdate 3 Reagent
Solution and close the
cell with the screw cap. Mix the contents by
carefully swaying the
cell. Allow to react for 4
minutes (temperature
dependence, see note). Add the contents of a
VARIO Silica Citric
Acid F10 powder pack
and close the cell with
the screw cap.
Mix the contents by
carefully swaying the
cell. Allow to react for 1
minute (temperature
dependence, see note). Add the contents of a
VARIO LR Silica Amino
Acid F F10 powder
pack, close the cell with
the screw cap and mix. Allow to react for 2
minutes. If SiO
2
is
present in the sample,
the solution becomes
blue.
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.
• The above mentioned reaction times are valid at room temperature (20 °C). At 10 °C the reaction time has to be doubled,
at 30 °C it has to be halved.
1:00 2:00
Silica LR vario
Program no.
321
*RN321*