Alkalinity Test Kits
Visual Kits
| Range | MDL | Method | Type | Test Kit | Refill |
|---|---|---|---|---|---|
| 10 - 100 ppm as CaCO3 (Total) | 10 ppm | Acid Titrant with pH Indicator | Titrets | K-9810 | - |
| 50 - 500 ppm as CaCO3 (Total) | 50 ppm | Acid Titrant with pH Indicator | Titrets | K-9815 | - |
| 100 - 1,000 ppm as CaCO3 (Total) | 100 ppm | Acid Titrant with pH Indicator | Titrets | K-9820 | - |
CHEMetrics offers test kits employing industry standard pH indicators to deliver sensitivity and accuracy within minutes. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.
CHEMetrics Titrets employ reverse titration technology to measure analyte concentration levels. The ampoule contains a premixed and premeasured quantity of acid titrant, while the sample volume is varied. After snapping the ampoule tip, the sample and indicator are drawn in a little at a time from the sample cup until a colour change signals that the end point has been reached. The amount of sample required to neutralise the acid titrant is proportional to the alkalinity of the sample, which is shown on the scale on the outer surface of the ampoule.
Alkalinity (Total)
CHEMetrics' total alkalinity tests determine Total (T) Alkalinity using a hydrochloric acid titrant and a bromocresol green/methyl red indicator. The end point of the titration occurs at pH 4.5 whereupon the indicator colour changes from pink to bright green. Results are expressed as ppm (mg/l) CaCO3. Please see the Alkalinity article for more information.
References:
ASTM D 1067-06, Acidity or Alkalinity of Water, Test Method B.
APHA Standard Methods, 22nd ed., Method 2320 B - 1997.
USEPA Methods for Chemical Analysis of Water and Wastes, Method 310.1 (1983).
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Technical Data Sheet |
Applications
Alkalinity is measured for different reasons depending on the industry. Alkalinity inhibits corrosion in cooling and boiler waters and can affect the amount of treatment chemicals that need to be added. Boiler operators must maintain relatively high hydrate alkalinity levels when phosphate cycle treatments are used to ensure the formation of softer, more easily removable deposits. Alkalinity is also measured as a means of controlling water and wastewater treatment processes or the quality of various process waters. Environmental monitoring groups utilise alkalinity to track the health of streams, lakes, and rivers.
What is Alkalinity?
The alkalinity of water is a measurement of its buffering capacity, in other words, the ability of a solution to neutralise acid or to resist resist acidification. Solutions above pH 4.5 are considered to have alkalinity. Alkalinity of natural waters is typically a combination of bicarbonate, carbonate, and hydroxide ions, and is a result of water passing through rocks and picking up minerals. The relative proportions of these ions vary depending on pH. Sewage and wastewaters usually exhibit higher alkalinities than natural waters due to the presence of silicates and phosphates.
Alkalinity is measured differently depending on the endpoint indictator being employed, i.e. the pH of the endpoint. The relative concentrations of bicarbonate, carbonate and hydroxide ions in a sample can be determined through calculation using a combination of measurements of Total and Phenolphthalein alkalinity.
Please see the Alkalinity article for more information.