Agent and process for the determination of calcium
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United States of America Patent
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Oct 3, 1989
Grant Date -
N/A
app pub date -
Apr 24, 1986
filing date -
Apr 24, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An agent and process are used for the determination of calcium in liquids. The agent contains essentially orthocresolphthalein complexone, an acid and a zwitterionic buffer and is characterized in that the buffer contains at least one sulphonic acid amine of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and denote H or alkyl, hydroxyalkyl or cycloalkyl having in each case up to 8 C atoms and R.sub.3 denotes alkyl or hydroxyalkyl having up to 8 C atoms.
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