Single drop method for determination of ions using an electrodeless piezoelectric quartz crystal

✍ Scribed by Toshiaki Nomura; Yukiko Ohno; Yutaka Takaji

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 457 KB
• Volume: 272
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80568-6

✦ Synopsis

A measuring system was constructed with a horizontal platinum plate, a plezoelectnc quartz crystal (quartz plate) on the platmum plate and a platmum wire set vertically above the centre of the platinum plate and at a distance of 0 8 mm from it m the same housing The platinum plate and the wire were connected to an oscdlator The procedure IS as follows set the quartz plate on the platinum plate, set the recorder to record the frequency, place a single drop of reagent solution contammg buffer and electrolyte on the quartz plate, leave for about 7 mm to obtain a constant frequency, place a single drop of the ion sample solution containing electrolyte and buffer on the quartz plate along with a platmum wire usmg a nucroplpette, read off the frequency shift (AF, Hz) between the frequency at the start (when the smgle drop of the sample solution was placed, F,) and that at 100 s later (F,), AF = F, -F2, and calculate the concentration of the ion from a calibration graph constructed with a standard solution Sulphate and potassium ions at levels of 50 PM-O 5 mM can be determmed usmg the banum salt or tetraphenylborate, respectively, with good reproduclblhty Keywo&s Plezoelectmc sensors, Ion sensors, Potassmm, Quartz crystal, Sodium