Nitrogen, Free Ammonia And Chloramine (Mono); Measuring Hints - Hach POCKET COLORIMETER II Instruction Manual

Nitrogen, Free Ammonia and Chloramine (Mono)

(0.04–4.50 mg/L Cl
Indophenol Method*
Scope and Application: For finished chloraminated drinking water

Measuring Hints

•
Collect samples in clean glass bottles. Results are most reliable from samples
analyzed as soon as possible after collection.
•
This method is intended for finished, chloraminated drinking water samples
that have a measurable combined (total) chlorine disinfectant residual.
Samples where the disinfectant residual has disappeared and exhibit a chlorine
demand may produce low ammonia test results. Blanks and ammonia
standards analyzed without a disinfectant residual must be prepared using
high quality, reagent grade water.
•
For more accurate chloramine results, determine a reagent blank for each new
lot of reagent using deionized water in place of the sample. Subtract the
reagent blank value from the final chloramine results.
Note:
The Pocket Colorimeter™ II is designed to measure solutions contained in sample cells. DO
NOT dip the meter in the sample or pour the sample directly into the cell holder.
* U.S. Patent 6,315,950
and 0.02–0.50 mg/L NH
2
1—9
–N)
3
Method 10200