Hanna Instruments HI 83200-01 - Manual (Page 62)

122 123 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 93731A-0 Zinc Reagent 1 packet
HI 93731B-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 128.
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
• Add the content of one packet of HI 93751-0
Indicator reagent.
• Replace the cap and shake gently for 1 minute.
• Reinsert the cuvette into the instrument.
• Press TIMER and the display will show the countdown
prior to the measurement or, alternatively, wait for
5 minutes and press READ. When the timer ends
the meter will perform the reading.
• The instrument displays concentration in mg/L of Sulfate (SO
4
2- ).
INTERFERENCES
Interferences may be caused by:
Calcium (as CaCO
3
) above 20000 mg/L
Chloride (as Cl - ) above 40000 mg/L
Magnesium (as MgCO
3
) above 10000 mg/L
Silica (as SiO
2
) above 500 mg/L
Color or suspended matter in large amounts will interfere: suspended matter should be removed by previous
filtration.
Organic matter in large amounts may impede the precipitation of barium sulfate.
Sulfate
12
3
6
9
1’