HARDNESS INDICATOR

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...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAJIMA, JUNICHI, ISSHIKI, KATSUFUMI, UKENA, YUUJI, TSUBOTA, YOSHITAMI, TACHINO, KAZUHIRO, FUKUMURA, TAKESHI, YAMASHITA, MASAZUMI, TAKECHI, SADATOSHI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	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.