フローインジェクション : 反応速度法による無電解ニッケルめっき浴中の次亜リン酸塩の簡易測定システム

概要

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A FIA-reaction rate method has been proposed for simple and rapid measurement of hypophosphite concentration in chemical nickel plating bath. The rate of reaction between hypophosphite and iodate in a continuous flow system was measured by monitoring the absorbance change at 460 nm due to reaction product. The sample solution taken from the plating bath was diluted 5 times with distilled water and a 70 ul portion was injected into the carrier stream in the flow system. The system is suitable for measuring hypophosphite ranging 1.9X10^<-2>〜5.7X10^<-2>M in the final diluted solution with the sample throughput of ca. 15 per hour. The relative standard deviation was 2.1% (n=5) for 4.7X10^<-2>M hypophosphite, No separation of the major constituent, nickel and other usual additives in the plating bath was needed.
1989-01-05