|Range||MDL||Method||Kit Catalog No.||Refill Catalog No.|
|50-500 ppm as CaCO3||50 ppm||EGTA (calcium)||K-1705|
|2-20 ppm as CaCO3||2.0 ppm||EDTA (total)||K-4502|
|20-200 ppm as CaCO3||20 ppm||EDTA (total)||K-4520|
|100-1000 ppm as CaCO3||100 ppm||EDTA (total)||K-4585|
Hardness is a measure of the mineral content of water. Calcium and magnesium are the most common minerals that contribute to hardness. Hard water causes scaling in boilers and other industrial equipment, and diminishes the effectiveness of soaps and detergents.
Shelf-life: eight months. Although the reagent itself is stable, the end point indicator has a limited shelf-life. We recommend stocking quantities that will be used within seven months.
The EDTA titrant is employed in alkaline solution with a calmagite indicator. This method determines the combined calcium and magnesium concentration of a sample. If no magnesium is present, the end point of the titration normally appears sluggish. Results are expressed as ppm (mg/L) CaCO3.