Differential-pulse adsorptive stripping voltammetric determination of tyrosine and histidine at a hanging mercury drop electrode after coupling with diazotized sulphanilic acid
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 116 (3) , 249-252
- https://doi.org/10.1039/an9911600249
Abstract
Tyrosine and histidine can be determined in the range between 5.0 × 10–8 and 1.0 × 10–6 mol dm–3 by differential-pulse adsorptive stripping voltammetry after derivatization with diazotized sulphanilic acid (DSA) at pH 9.2 for 1 h. The amount of DSA added has to be controlled as, in large excess, DSA competes with the derivatives for adsorption on the electrode surface. The relative standard deviation (six determinations at the 2.5 × 10–7 mol dm–3 level) was typically 5%.Keywords
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