Hanna Instruments HI 83208, Instruction Manual

Page: 35 / 39

68 69
Zinc
ZINC
SPECIFICATIONS
Range 0.00 to 3.00 mg/L
Resolution 0.01 mg/L
Accuracy ±0.03 mg/L ±3% of reading
Typical EMC ±0.01 mg/L
Deviation
Light Source
Tungsten lamp with narrow band interference filter @ 575 nm
Method Adaptation of the
Standard Methods for the Examination of Water and Wastewater,
18
th
edition, Zincon method. The reaction between zinc and the reagents causes an
orange to a dark violet tint in the sample.
REQUIRED REAGENT
Code Description Quantity
HI 93731 A -0 Zinc Reagent 1 packet
HI 93731 B -0 Cyclohexanone 0.5 mL
REAGENT SETS
HI 93731-01 Reagents for 100 tests
HI 93731-03 Reagents for 300 tests
For other accessories see page 73.
MEASUREMENT PROCEDURE
• Select the Zinc method using the procedure described in the
Method Selection section (see page 12).
• Fill one graduated mixing cylinder up to the 20 mL mark with
the sample.
• Add the content of one packet of HI 93731A-0 zinc reagent, close
the cylinder and invert several times to mix until completely
dissolved.
• Fill one cuvette with 10 mL of the reacted sample up to the mark.
20 mL
10 mL
Silver
• Press 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 silver.
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 completely
dissolved.
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
10 mL
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