Hanna Instruments HI 83200C - Manual (Page 59)

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 93737 A-0 Buffer Reagent A 1 mL
HI 93737 B-0 Buffer Reagent B 1 mL
HI 93737 C-0 Indicator Reagent C 2 mL
HI 93737 D-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 ▲ or ▼ to access the second level functions.
• Press the
Chem Frm key to convert the result in mg/L of Silicon (Si).
• Press ▲ or ▼ 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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