Hach POCKET COLORIMETER II Instruction Manual page 40

information.) In addition, a user-generated calibration curve can be made and
programmed into the Pocket Colorimeter™ II. See
Prepared Standards on page 2—17
calibration curve.
Standard Solution Preparation
1. Prepare the following monochloramine standard fresh before use.
2. Add the contents of one pillow Buffer Powder, pH 8.3 to about 50-mL of
Organic Free Water in a clean 100-mL Class A volumetric flask. Swirl to
dissolve the powder.
3. Using a Class A volumetric pipet, transfer 2.00 mL of Ammonia Nitrogen
Standard Solution, 100 mg/L as NH
4. Dilute to volume with Organic Free Water, cap and mix thoroughly. This is a
2.00 mg/L buffered ammonia standard.
5. Pipet 30.00 mL of the buffered ammonia standard into a clean 100-mL beaker
with a stir bar.
6. Obtain a recent lot of Chlorine Solution Ampules, 50 –70 mg/L, and note the
actual Free Chlorine concentration for this lot.
网址：www.mamots.com
Chloramine (Mono),
Calibration Procedure Using
for more information about preparing a full
–N into the flask.
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