|
| Hach Company |
| 8202 |
| 2003 |
| Descriptive Name: Phenolphthalein (Total) Acidity of Water Official Name: Phenolphthalein (Total) Acidity |
| Media: WATER |
| Inorganic |
| Hach Water Handbook (1997) |
This is a proprietary method.
Please visit the method owner's site for method documentation |
| Bromophenol blue indicator is used to titrate the sample with sodium hydroxide to a colorimetric end point. Bromophenol blue gives a better end point than methyl orange indicator. Titration to pH 3.7 determines strong mineral acidity (also referred to a methyl orange acidity. The results are expressed in mg/L as calcium carbonate (CaCO3) at a specified pH. |
| For water, wastewater, and seawater |
| 10-4000 mg/L as CaCO3 |
| Highly colored or turbid samples may mask the color change at the end point. Use a pH meter for these samples, titrating to pH 3.7 for methyl orange acidity. |
| |
| Collect samples in clean plastic or glass bottles. Fill completely and cap tightly. Minimize agitation or prolonged exposure to air. Samples may be stored at least 24 hours by cooling to 4deg C. or below if they cannot be analyzed immediately. Warm to room temperature before analyzing. |
| 24 hours @ 4deg. C. |
| Less than $50 |
| |
| |