Chemistry: electrical and wave energy – Processes and products
Patent
1987-03-17
1989-09-12
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204403, 204416, 2524081, G01N 2746
Patent
active
048656984
ABSTRACT:
A reference solution for measuring an ionic activity which is utilized at the time of measuring the activity of a particular ion in an aqueous solution by the differential method using ion-selective electrodes, which is characterized by containing the compound having the general formula (I), (II) or (III) and an electrolyte. ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 represent hydrogen atom or a lower alkyl group, respectively, and at least, one or R.sub.3 and R.sub.4 is a lower alkyl group, and X represents chlorine atom or bromine atom, ##STR2## wherein R.sub.5 represents hydrogen atom or a lower alkyl group and A represents a hydrogen atom or a halogen atom, and ##STR3## wherein R.sub.6 represents a hydrogne atom or a lower alkyl group. The reference solution of the invention may be preserved for a long period at room temperature without putrifaction, and the compound (I), (II) or (III) in the reference solution does not or scarcely influence upon the potential difference generated in the ion-selective electrode.
REFERENCES:
patent: 4163734 (1989-08-01), Sorensen et al.
patent: 4279653 (1981-07-01), Makishima
patent: 4299728 (1981-11-01), Cormier et al.
patent: 4369127 (1983-01-01), Cormier et al.
patent: 4490462 (1984-12-01), Kawaguchi
Fuji Photo Film Co. , Ltd.
Hsing Ben C.
Niebling John F.
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