A flow-through electrode unit for use with a liquid ion-exchange nitrate electrode is described. Temperature control to within ±0·5° C at 25° C and reproducible stirring of the test medium give a mean coefficient of variation of 0·36 per cent. for standards and 0·63 per cent. for plant extracts. The average time for each nitrate concentration measurement is halved.
P. J. Milham, Analyst, 1970, 95, 758 DOI: 10.1039/AN9709500758
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