Testing Samples For Total Hardness - Hach APA 6000 Operation Manual

Section 5
Repeat
steps 1-8 twice.
9. Repeat steps 1-8 twice. 10. Use the average

5.3 Testing Samples for Total Hardness

Page 24
Testing Samples for Total Hardness
Average the three
values for the titer
of Reagent 3
value for the titer of
Reagent 3.
Refer to Table 9 to choose between using a buret or a digital titrator,
depending on the sample concentration.
Use the information in
pipet size for the digital titrator procedure.
Use the information in
pipet size for the buret titration procedure.
Sample Concentration
(mg/L as CaCO
10 – 100
100 – 1000
Table 10 Required Sample Volume for Digital Titrator Procedure
Sample Concentration
(mg/L as CaCO
10 – 50
50 – 100
Table 11 Required Sample Volume for Buret Titration Procedure
Sample Concentration
(mg/L as CaCO
100 – 250
250 – 500
500 – 1000
Table 10 to determine the correct sample volume and
Table 11 to determine the correct sample volume and
Table 9 Choosing a Titration Method
)
3
)
3
)
3
Titration Method
Digital Titrator
Buret
Sample Volume (mL)
20
10
Sample Volume (mL)
100
50
20
6200018bench.fm