Abstract: Micro droplets are accurately placed in a reaction well. The reaction well (5) is formed in one surface of a well base (3). A channel base (11) is placed on the well base (3). The channel base (11) has, in its surface joined to the well base (3), a liquid introduction channel (12a) and a reaction well air vent channel (18a). The channel base (11) also has a recess (27) formed opposite to the reaction well (5) and recessed upward from the upper surface of the liquid introduction channel (12a). When viewed from above, a shoulder part (26) of the recess (27) is placed near the connection part between the reaction well (5) and the liquid introduction channel (12a) and is closer to the center of the reaction well (5) than a shoulder part (16) of the reaction well (5).

Abstract: [PROBLEMS] To use in a carbon dioxide separation part a gas-permeable membrane capable of maintaining high-speed determination and to diminish the influence of interfering ingredients. [MEANS FOR SOLVING PROBLEMS] An apparatus which comprises: an organic-substance oxidation part in which organic substances contained in a sample water supplied are oxidized into carbon dioxide; a carbon dioxide separation part in which the carbon dioxide contained in the sample water treated with the organic-substance oxidation part is caused to permeate and come into a measurement water; and a conductivity measurement part in which the conductivity of the measurement water sent from the carbon dioxide separation part is measured.

Abstract: A total organic carbon measuring instrument including a measuring unit composed of, integrated together, organic substance oxidation part (24) and carbon dioxide separation part (20) and conductivity measuring part (34), control unit (40) and data processing unit (41). In order to enhance the accuracy of conductivity measurement, the control unit (40) is constructed so as to stop feeding of a sample water at the time of oxidation of organic substance and carry out feeding of the sample water at the time of sample water moving to the organic substance oxidation decomposition part (20) and carbon dioxide separation part (24). The data processing unit (41) is constructed so as to measure the total organic carbon concentration on the basis of conductivity at the time of arriving of sample water irradiated with ultraviolet rays of which relative intensity is a given value or higher at the carbon dioxide separation part (24).

Abstract: In order to control bubble removal or mixing in a flow channel, bubble transfer between flow channels (1, 2) is controlled by disposing first flow channel (1) for flow of a first fluid of liquid or gas and second flow channel (2) for flow of a second fluid of liquid with, interposed therebetween, gas exchange unit (5) through which while no liquid can pass, a gas component can be transferred, and by providing a pressure difference between the flow channels (1, 2) with the gas exchange unit (5). By rendering the pressure of the second flow channel (2) higher than that of the first flow channel (1), any bubble transfer from the first fluid to the second fluid is prevented, or bubbles within the second fluid are transferred into the first fluid to thereby attain deaeration.

Abstract: To provide a flow cell that is free from liquid leakage and excels in chemical resistance. There is provided a preferred form of flow cell comprising flat-plate glass substrate (3); adherent fluororesin sheet (5) having a groove as flow channel (7) made by cutting machining; and glass substrate (1) as lid member furnished with through-holes (9, 11) as fluid inlet and outlet at positions corresponding to both end portions of the groove. The fluororesin sheet (5) is interposed between the glass substrates (1, 3) and, while heating at a temperature not lower than the melting point of the fluororesin sheet (5), pressurized so that the glass substrates (1, 3) are bonded together by the fluororesin sheet (5) per se. Flow channel member (17) is constructed by the glass substrate (3) and, bonded thereonto, the fluororesin sheet (5).

Abstract: A device for measuring total organic carbon includes an organic substance oxidative decomposition section (4) for converting organic carbon contained in sample water into carbon dioxide, a carbon dioxide extraction section (6) for extracting carbon dioxide generated in the organic substance oxidative decomposition section (4) into measurement water, and a detection section for measuring the conductivity of the measurement water discharged from the carbon dioxide extraction section (6) to determine the amount of the extracted carbon dioxide. A syringe pump (12) is provided downstream of the detection section (11) in a measurement flow path (16) through which measurement water flows to pass through the carbon dioxide extraction section 6 and the detection section (11). The flow rate of measurement water during measurement of conductivity in the detection section (12) is controlled by suction into the syringe pump.

Abstract: Disclosed is a total organic carbon (TOC) measurement apparatus capable of facilitating reduction in size of the apparatus and achieving enhanced measurement accuracy. The TOC measurement apparatus includes an organics oxidation unit, a carbon-dioxide separation unit and a conductivity measurement unit, which are integrally formed by laminating a plurality of plates to define therebetween and incorporate therein an oxidizing flow passage, an aqueous-sample flow passage, a gas permeable membrane, a measurement-water flow passage and a conductivity measuring electrode. The TOC measurement apparatus is designed such that carbon oxide in an aqueous sample is transferred from the aqueous-sample flow passage to the measurement-water flow passage through the gas permeable membrane, and a conductivity of measurement water which contains the carbon oxide and flows through a flow passage facing the conductivity measuring electrode is determined and converted to a TOC content.

Abstract: A gas exchange chip comprises substrates (1,2); two flow channels (3,4) formed in the substrates (1,2) and each having an inlet port and an outlet port; and multiple grooves (9) interlinking the flow channels (3,4). The grooves (9) have the size of their sectional area predetermined and have at least a part of the internal surface thereof rendered hydrophobic so as to permit the transfer of gas component while inhibiting any liquid passage. A sample water containing carbon dioxide is caused to flow through one of the flow channels (3) while pure water is caused to flow through the other flow channel (4) to thereby transfer the carbon dioxide contained in the sample water into the pure water.