Polarographic reduction of 2,4,6-trinitrobenzene-1-sulphonic acid and some 2,4,6-trinitrophenyl-amino acid derivatives |
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Authors: | MA Al-Hajjaji |
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Institution: | Chemistry Department, College of Science, King Saud University, Riyadh Saudi Arabia |
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Abstract: | The rapid d.c. polarography of 2,4,6-trinitrobenzene-1-sulphonic acid and its derivatives with serine (I), threonine (II), glycine (III) and histidine (IV) revealed a 3-wave reduction and a marked pH dependence of the reduction potential. The polarographic waves of the derivatives (2.5 × 10?4 M) showed appreciable changes when sulphite ions were present, with the development of a new wave at more negative potential in ?0.01 M sulphite solutions at pH 7.0. The E1/2 values of these waves in pH 7.0 supporting electrolyte were: (I) ?1000; (II) ?1007; (III) ?1021; (IV) ?949 mV (vs. Ag/AgCl, sat. KCl). These waves were used to determine the amino acids investigated (1–4 × 10?4 M) in the presence of excess of 2,4,6-trinitrobenzene-1-sulphonic acid, with good precision (2%). |
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