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Apparatus for determination of microconstituents
| Details |
Inventors: Hanaoka, Yuzuru; Murayama, Takeshi; Matsuura, Tamizo;
Assignee: Yokogawa Electric Corporation (Tokyo, JP)
Primary Examiner: Hill, Jr.; Robert J.
Assistant Examiner:
Attorney, Agent or Firm: Kojima; Moonray
A method and apparatus for determining, by use of ion chromatography, a microconstituent contained in a major constituent as impurities present in the major constituent. The invention causes only that portion of the effluent from the detector, shown on an ion chromatograph, that corresponds to the neighborhood of the microconstituent to be led again to the collecting valve. Thus, the microconstituent of the solution can be determined quickly and easily, without reference to the kind of microconstituent being tested. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Turning to FIG.
2, tanks 11a and 11b are used, respectively, for storing an eluate solution and a removing solution, which are pumped respectively, by a liquid feed pump 12a, and 12b.
A damper 13 is connected as shown to pump 12a so as to prevent pulsation of the eluate.
Pressure gauge 14 is connected as shown.
A first sample valve 15 and second sample valve 16 are connected between pump 12a and separation column 17.
Valve 15 comprises first through sixth connecting ports 15a-15f and a metering tube 15a and is provided with an internal flow path adapted to be alternately switched between a connected state indicated by solid line and a connected state indicated by the dotted line.
Second sample valve 16 comprises first through sixth connecting ports 16a-16f and a metering tube 16g and is provided with an internal flow path adapted to be alternately switched between a connected state indicated by the solid line and a connected state indicated by the dotted line.
Separation column 17 is packed, for example, with an anion-exchange resin, and is connected to a suppressor 18, which comprises a double tube construction having the interior thereof divided with a tube 18a made, for example, of a cation exchange membrane, into an internal chamber 18b and an external chamber 18c.
The effluent is then applied to a detector formed, for example, of an electric conductivity meter.
A constant temperature bath 20 is provided for accommodating therein separation column 17, suppressor 18, and detector 19, and maintains these components at a prescribed temperature.
A switch valve 21 comprises first through third connection ports 21a-21c and is provided with an internal flow path adapted to to be alternately switched between a connected state indicated by the solid line and a connected state indicated by the dotted line.
The valve 21 may be connected to valve 16 as depicted.
Waste solution tank 11d, for the removing solution, and 11c for the effluent are connected as depicted
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Liquid Purification 
