The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1989
Filed:
Mar. 17, 1987
Masaaki Terashima, Saitama, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
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.