Hanna Instruments HI 83099 User Manual
Page 64
127
126
Zinc
ZINC
SPECIFICATIONS
Range
0.00 to 3.00 mg/L
Resolution
0.01 mg/L
Accuracy
±0.03 mg/L ±3% of reading at 25 °C
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 132.
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 invert gently to mix
for 1 minute (about 30 inversions).
• 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