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1. 发明授权

US3922205A Portable polarographic analyzer and quick polarographic determinations 失效
标题翻译：便携式极谱分析仪和快速极谱法测定
公开(公告)号：US3922205A
公开(公告)日：1975-11-25
申请号：US51096474
申请日：1974-10-01
申请人： DOW CHEMICAL CO
发明人： MCLEAN JAMES D , HOLLAND JOHN F
IPC分类号： G01N27/48 , G01N33/00
CPC分类号： G01N33/0047 , G01N27/48
摘要： compounds, such as aldehydes, by reacting the test sample in aqueous medium with a hydrazine acid addition salt at a pH of about 3 to 6.5 to form the hydrazone in aqueous medium which is detectable with great sensitivity and specificity. The working electrode may be underlying or may be suspended, but in any event, is best replaced or renewed or cleaned between determinations. In an embodiment that is especially useful for carrying out polarographic analysis in non-aqueous, but conducting, medium there is employed a third electrode, a counter electrode, and the special circuit includes an operational amplifier electrically connected to each of the counter electrode and the reference electrode in such a way that the reference electrode is nonworking and relatively non-variant, the current flow in the cell being between the working electrode and the counter electrode as monitored and controlled in response to the reference electrode.

A special purpose portable polarographic instrument and method for the rapid repetitive quantitative determination of polarographically reactive species in aqueous solution utilizing a sample cell in which are placed a conducting sample solution, a suitable reference electrode and a fixed area working electrode and, connected to the electrodes, a special circuit for (1) impressing across the cell a reducing or oxidizing voltage throughout a time linear pre-selected range of scanning potential, (2) proportionately converting the consequent current flow to a potential, and (3) measuring the potential. The maximum potential is retained in a peak seeking voltage circuit and is read on a voltmeter in a voltage follower circuit. The polarographic test utilizing the instrument is made more specific for
摘要翻译：一种特殊用途的便携式极谱仪和方法，用于使用样品池在水溶液中快速重复定量测定极谱反应物质，其中放置导电样品溶液，合适的参比电极和固定区工作电极，并连接到电极（1）在扫描电位的整个时间线性预选范围内，在整个电池上印刷减小或氧化电压的特殊电路，（2）将随后的电流比例成比例地转换成电势，以及（3）测量电位。最大电位保留在峰值寻找电压电路中，并在电压跟随器电路的电压表上读取。使用该仪器的极谱测试通过使水性介质中的测试样品与约3至6.5的pH值的肼酸加成盐反应，使O PARALLEL -C-化合物（例如醛）更具特异性，以形成含水的腙可以很好的灵敏度和特异性检测的培养基。工作电极可能是潜在的或可能被暂停，但在任何情况下，最好在测定之间进行更换或更新或清洁。

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