User Manual

116 117
Silver
SILVER
SPECIFICATIONS
Range 0.000 to 1.000 mg/L
Resolution 0.005 mg/L
Accuracy ±0.020 mg/L ±5% of reading at 25 °C
Typical EMC ± 0.001 mg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 575 nm.
Method Adaptation of the PAN method. The reaction between silver and reagents causes an
orange tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93737A-0 Buffer Reagent A 1 mL
HI 93737B-0 Buffer Reagent B 1 mL
HI 93737C-0 Indicator Reagent C 2 mL
HI 93737D-0 Fixing Reagent D 2 mL
HI 93703-51 Dispersing Agent 4-6 drops
REAGENT SETS
HI 93737-01 Reagents for 50 tests
HI 93737-03 Reagents for 150 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
Select the
Silver
method using the procedure described in
the
Method Selection
section (see page 12).
Note: for best results perform your tests between 20-24°C.
Fill two graduated beakers with 25 mL of sample.
Add 1.0 mL of HI 93737A-0 Buffer reagent to one beaker
(the blank) and swirl gently to mix.
Silica
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 93705C-0 Amino acid reagent and shake until it is
completely dissolved.
Reinsert the cuvette into the instrument.
Press Timer and the display will show the countdown
prior to the measurement. Alternatively, wait for exactly 3
minutes and press Read. When the timer ends the meter
will perform the reading. The instrument displays
concentration in mg/L of silica (SiO
2
).
Press s or t to access the second level functions.
Press the Chem Frm key to convert the result in mg/L of Silicon (Si).
Press s or t to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
Phosphate above 60 mg/L
Phosphate above 75 mg/L
Sulfide and high concentration of iron
Eliminate color and turbidity interferences by zeroing the meter with the original water sample.
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