Hanna Instruments HI 83212 - Manual (Page 24)

46 47 Silver
• Press ZERO key. The display will show “-0.0-” when the meter is zeroed and ready for measurement.
• Fill a second cuvette up to the mark with 10 mL of the reacted sample.
• Insert the second cuvette into the instrument.
• Press READ to start the reading. The instrument displays
the results in mg/L of silver.
Note: a temperature above 30°C may cause turbidity. In this case, before zeroing and taking readings,
add 2-3 drops of Dispersing agent (HI 93703-51) to each cuvette and swirl until turbidity is completely
dissolved.
INTERFERENCES
Interference may be caused by:
Al
3+ above 30 mg/L Fe 2+ above 1.5 mg/L
Ca 2+ above 1000 mg/L as CaCO
3
Fe 3+ above 10 mg/L
Cd 2+ above 20 mg/L K + above 500 mg/L
Cl - above 8000 mg/L Mn 2+ above 25 mg/L
Co 2+ above 1.5 mg/L Mg 2+ above 1000 mg/L as CaCO
3
Cr 3+ above 20 mg/L Na + above 5000 mg/L
Cr 6+ above 40 mg/L Ni 2+ above 1.5 mg/L
Cu 2+ above 15 mg/L Pb 2+ above 20 mg/L
F - above 20 mg/L Zn 2+ above 30 mg/L
10 mL
# 2
# 2
Silver
• Add exactly 1.0 mL of HI 93737B-0 Buffer reagent to the second beaker
(the sample) and swirl gently to mix.
• Press TIMER and the display will show the countdown prior to adding reagent C or, alternatively, wait
for 2 minutes. Then add exactly 1.0 mL of HI 93737C-0 Indicator reagent to each beaker and swirl.
• Press TIMER or, alternatively, wait for 2 minutes. Then, in both cases, add 1.0 mL of HI 93737D-0
Fixing reagent to each beaker and swirl.
• Then press TIMER or, alternatively, wait for 2 minutes to allow reaction to complete.
• Fill one cuvette up to the mark with 10 mL of the blank.
• Place the cuvette into the holder and close the lid.
# 2
# 2 # 1
# 2
10 mL
# 1
# 1
# 1
10 mL