Hanna Instruments HI 83200C - Manual (Page 60)

118 119 Silver
• Press the 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.
• Add 3 drops of Dispersing Agent (HI 93703-51),
replace the cap and invert gently to mix for about 10
seconds.
• Insert the second cuvette into the instrument.
• Press Read to start the reading. The instrument displays the results in mg/L of silver.
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
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. Press Timer or, alternatively, wait for
2 minutes.
• Fill one cuvette up to the mark with 10 mL of the blank.
• Add 3 drops of Dispersing Agent (HI 93703-51), replace the cap
and invert gently to mix for about 10 seconds.
• Place the cuvette into the holder and close the lid.
# 2
# 2 # 1
# 2 # 1
# 1
# 1
10 mL
10 mL
# 2
# 2