Phosphonates - Hach POCKET COLORIMETER II Instruction Manual

Phosphonates

For water, wastewater, and seawater.
Persulfate UV Oxidation Method*
Hydrochloric Acid Solution (Cat. No. 884-49), followed by a distilled water
rinse. Do not clean glassware with commercial detergent.
•
Wear UV safety goggles while the UV lamp is on.
•
Do not handle the UV lamp surface. Fingerprints will etch the glass. Wipe the
lamp with a soft, clean tissue between samples.
•
The digestion in step 6 is normally completed in less than 10 minutes.
However, contaminated samples or a weak lamp can cause incomplete
phosphate conversion. Check conversion efficiency by running a longer
digestion and seeing if the readings increase.
Note:
The Pocket Colorimeter II is designed to measure solutions contained in sample cells.
dip the meter in the sample or pour the sample directly into the cell holder.
DO NOT
* Adapted from Blystone, P., Larson, P., A Rapid Method for Analysis of Phosphonate
Compounds, International Water Conference, Pittsburgh, PA, Oct. 26-29, 1981.
(0.1–2.5 to 1–125 mg/L)
1—39
•
Clean glassware with 1:1
Method 8007