Manual

84 85
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