Hardness indicator

Details Hardness indicator Hardness indicator

G - Physics

01

N

G01N 31/22 (2006.01) G01N 33/18 (2006.01)

Patent

CA 2245745

A hardness indicator is provided which is highly reactive to a trace amount of Ca2+, and which is slow to degradate in a high temperature environment of not less than 50 °C. In one embodiment, the hardness indicator comprises EBT, a pH buffer, and a masking agent as main components, and an admixture of Mg-EDTA. In another embodiment, the hardness indicator comprises EBT, a pH buffer, and a masking agent as main components, and an admixture of a Mg-EDTA such that a water molecule has been removed from a Mg-EDTA hydrate. In another embodiment, the hardness indicator comprises EBT, a pH buffer, and a masking agent as main components, and an admixture of a Mg-EDTA such that water a molecule has been removed from a Mg-EDTA hydrate and of a reducing agent. In a further embodiment, the hardness indicator comprises EBT, a pH buffer, and a masking agent as main components, and an admixture of Mg-EDTA and a reducing agent. In a still further embodiment, the hardness indicator comprises EBT, a pH buffer, and a masking agent as main components, and an admixture of a reducing agent.

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