Hanna Instruments HI 83208-2008 - Manual (Page 18)

34 35 Iron LR
IRON LOW RANGE
SPECIFICATIONS
Range 0 to 400 µg/L
Resolution 1 µg/L
Accuracy ±10 µg/L ±8% of reading
Typical EMC ±1 µg/L
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 575 nm
Method Adaptation of the TPTZ Method. The reaction between iron and the reagent causes a
violet tint in the sample.
REQUIRED REAGENTS
Code Description Quantity
HI 93746-0 TPTZ Reagent 2 packets
REAGENT SETS
HI 93746-01 Reagents for 50 tests
HI 93746-03 Reagents for 150 tests
For other accessories see page 73.
MEASUREMENT PROCEDURE
• Select the Iron LR method using the procedure described in
the Method Selection section (see page 12).
• Fill one graduated mixing cylinder up to the 25 mL mark
with deionized water.
• Add the content of one packet of HI 93736-0 TPTZ reagent,
close the cylinder and shake vigorously for 30 seconds. This is
the blank.
• Fill a cuvette with 10 mL of the blank up to the mark and
replace the cap.
• Place the cuvette into the holder and close the lid.
12
3
6
9
30"
10 mL
25 ml
Iron HR
• Reinsert the cuvette into the instrument.
• Press TIMER and the display will show the countdown
prior to the measurement or, alternatively, wait for 3
minutes and press READ. When the timer ends the
meter will perform the reading.
• The instrument displays concentration in mg/L of iron.
INTERFERENCES
Interference may be caused by:
Molybdate Molybdenum above 50 ppm
Calcium above 10000 ppm (as CaCO
3
)
Magnesium above 100000 ppm (as CaCO
3
)
Chloride above 185000 ppm.