| 摘要 |
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.degree.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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| 申请人 |
MIURA CO., LTD.;MIURA INSTITUTE OF RESEARCH & DEVELOPMENT CO., LTD. |
发明人 |
TAKECHI, SADATOSHI;YAMASHITA, MASAZUMI;NAKAJIMA, JUNICHI;ISSHIKI, KATSUFUMI;TSUBOTA, YOSHITAMI;FUKUMURA, TAKESHI;TACHINO, KAZUHIRO;UKENA, YUUJI |
