Continuous-flow determination system based on null-point potentiometry using a nitrate ion-selective membrane

A new automated potentiometric analysis system for nitrate was developed. This system is based on the principle of null-point potentiometry. On either side of a nitrate ion-selective PVC membrane were the flowing sample and standard nitrate solutions. The concentration of the latter was automaticall...

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Bibliographic Details
Published in:	Analytica chimica acta Vol. 355; no. 2; pp. 211 - 216
Main Authors:	Hara, Hirokazu, Izumiyama, Fumiko
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 28-11-1997
Subjects:	Automated analysis Flow analysis Nitrate ion-selective electrode Null-point potentiometry Rain water Nitrate ion-selective electrode Automated analysis Rain water Null-point potentiometry Flow analysis
Online Access:	Get full text
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Summary:	A new automated potentiometric analysis system for nitrate was developed. This system is based on the principle of null-point potentiometry. On either side of a nitrate ion-selective PVC membrane were the flowing sample and standard nitrate solutions. The concentration of the latter was automatically matched with that of the sample solution by controlling the dilution rate of a basic standard solution so that the membrane potential reached the `null-point'. The determination without using a calibration graph was possible. The precision of five independent determinations was within 8% in the concentration range above 1 × 10 −5 mol dm −3. This system was applied to rain water analysis.
ISSN:	0003-2670 1873-4324
DOI:	10.1016/S0003-2670(97)00508-4