Hanna Instruments HI 83099 - Manual (Page 43)

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INTERFERENCES
Interference may be caused by:
Co
2+ must not be present
Fe 2+ must not be present
Al 3+ above 32 mg/L
Ca 2+ above 1000 mg/L (as CaCO
3
)
Cd 2+ above 20 mg/L
Cl¯ above 8000 mg/L
Cr
3+ above 20 mg/L
Cr 6+ above 40 mg/L
Cu 2+ above 15 mg/L
F¯ above 20 mg/L
Fe
3+ above 10 mg/L
K + above 500 mg/L
Mg 2+ above 400 mg/L
Mn 2+ above 25 mg/L
Mo 6+ above 60 mg/L
Na + above 5000 mg/L
Pb 2+ above 20 mg/L
Zn 2+ above 30 mg/L
Nickel LR Nickel LR
• Press Timer and the display will show a countdown prior to adding reagent C or, alternatively, wait
for 15 minutes. Add one packet of HI 93740C-0 EDTA reagent to each beaker, cap and swirl to mix
until completely dissolved.
• Fill one cuvette up to the mark with 10 mL of the blank.
• Place the cuvette into the holder and close the lid.
• 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.
• Insert the second cuvette into the instrument.
• Press Read to start the reading. The instrument displays the results in mg/L of nickel.
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 removed.
10 mL
10 mL