Hanna Instruments HI 83208-2008 - Manual (Page 19)

36 37 Iron LR
INTERFERENCES
Interference may be caused by:
Cadmium above 4.0 mg/L
Chromium 3+ above 0.25 mg/L
Chromium 6+ above 1.2 mg/L
Cobalt above 0.05 mg/L
Copper above 0.6 mg/L
Cyanide above 2.8 mg/L
Manganese above 50.0 mg/L
Mercury above 0.4 mg/L
Molybdenum above 4.0 mg/L
Nickel above 1.0 mg/L
Nitrite ion above 0.8 mg/L
Sample pH should be between 3 and 4 to avoid developed color to fade or turbidity formation.
Iron LR
• Press ZERO key. The display will show “-0.0-” when the meter is zeroed and ready for measurement.
• Remove the cuvette.
• Fill another graduated mixing cylinder up to the 25 mL mark
with the sample.
• Add the content of one packet of HI 93746-0 TPTZ reagent,
close the cylinder and shake vigorously for 30 seconds. This is the
reacted sample.
• Fill a cuvette with 10 mL of the reacted sample up to the mark
and replace the cap.
• Insert the sample into the instrument.
• Press TIMER and the display will show the countdown
prior to the measurement or, alternatively, wait for 30
seconds and press READ. When the timer ends the
meter will perform the reading. The instrument displays
concentration in µg/L of iron.
25 ml
10 mL
12
3
6
9
30"