Method and device of measuring ion activity
First Claim
1. A method of measuring ion activity of a liquid sample comprising steps of spotting a reference liquid and the liquid sample on surfaces of ion-selective membranes, respectively, of at least a pair of ion-selective electrode sheets which are electrically insulated from each other, said ion-selective membranes being arranged on the top of said ion-selective electrode sheets;
- and measuring a potential difference between said both ion-selective electrodes under the condition that said both liquids are electrically connected to each other by a bridge, which is characterized in that;
said each ion-selective electrode sheet is arranged upside down in such a manner that the ion-selective membrane is positioned on the lowest side; and
said each liquid spotted from the upper side is temporarily conveyed downwardly to the lower level than the surface of the ion-selective membrane, and then conveyed upwardly to the surface of the ion-selective membrane so as to reach the surface of the ion-selective membrane.
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Accused Products
Abstract
In a method of measuring ion activity of a liquid sample comprising steps of spotting a reference liquid and the liquid sample on surfaces of ion-selective membranes, respectively, of at least a pair of ion-selective electrode sheets which is electrically insulated from each other, said ion-selective membranes being provided on the top of said ion-selective electrode sheets; and measuring a potential difference between the ion-selective electrodes under the conditions that both liquids are electrically connected to each other by a bridge, the improvement wherein:
said each ion-selective electrode sheet is arranged upside down in such a manner that the ion-selective membrane is positioned on the lowest side; and
said each liquid spotted from the upper side is temporarily conveyed downwardly to the lower level than the surface of the ion-selective membrane, and then conveyed upwardly to the surface of the ion-selective membrane so as to reach the surface of the ion-selective membrane. A device employable in the method is also disclosed.
29 Citations
9 Claims
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1. A method of measuring ion activity of a liquid sample comprising steps of spotting a reference liquid and the liquid sample on surfaces of ion-selective membranes, respectively, of at least a pair of ion-selective electrode sheets which are electrically insulated from each other, said ion-selective membranes being arranged on the top of said ion-selective electrode sheets;
- and measuring a potential difference between said both ion-selective electrodes under the condition that said both liquids are electrically connected to each other by a bridge, which is characterized in that;
said each ion-selective electrode sheet is arranged upside down in such a manner that the ion-selective membrane is positioned on the lowest side; and said each liquid spotted from the upper side is temporarily conveyed downwardly to the lower level than the surface of the ion-selective membrane, and then conveyed upwardly to the surface of the ion-selective membrane so as to reach the surface of the ion-selective membrane. - View Dependent Claims (2, 3, 4)
- and measuring a potential difference between said both ion-selective electrodes under the condition that said both liquids are electrically connected to each other by a bridge, which is characterized in that;
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5. A device for measuring ion activity in a liquid sample comprising at least a pair of ion-selective electrode sheets having ion-selective membranes on the top portion, liquid-guiding portions for guiding a reference liquid and a liquid sample to each surface of said ion-selective membranes, respectively, and a bridge for electrically connecting both liquids to each other, which is characterized in that:
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said each ion-selective electrode sheet is arranged upside down in such a manner that the ion-selective membrane is positioned on the lowest side; and said each liquid-guiding portion comprises a liquid receiving opening, a downward passage for conveying the liquid to the lower level than the surface of the ion-selective membrane, a horizontal passage for conveying the liquid in the horizontal direction to the position just below the surface of the ion-selective membrane, and an upward passage for conveying said liquid to the surface of the ion-selective membrane. - View Dependent Claims (6, 7, 8, 9)
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Specification