Method Performance - Hach POCKET COLORIMETER II Instruction Manual

Chloramine (Mono),
7. Calculate the amount of Chlorine Solution to be added to the ammonia
standard using the following equation:
mL chlorine solution required
8. Open an ampule and use a glass Mohr pipet to add the calculated amount of
Chlorine Solution slowly to the ammonia standard, while mixing at medium
speed on a stir-plate.
9. Allow the monochloramine solution to mix for 1 minute after all the Chlorine
Solution is added.
10. Quantitatively transfer the monochloramine solution to a clean 100-mL
Class A volumetric flask. Dilute to the mark with Organic Free Water, cap, and
mix thoroughly. This is a nominal 2.7 mg/L (as Cl
Use this standard within 1 hour of preparation.

Method Performance

Precision
Typical Precision (95% Confidence Interval) = 2.25 ± 0.04 mg/L as Cl
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free chlorine concentration
1—40
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) monochloramine standard.
2
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