Simultaneous determination of propacetamol and paracetamol by derivative spectrophotometry |
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Authors: | Rodenas V García M S Sánchez-Pedreño C Albero M I |
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Institution: | College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China. |
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Abstract: | The present paper describes a procedure that phenols in air were preconcentrated in a membrane cell and their content was determined by adsorptive polarography. First, the phenols in air samples were preconcentrated in a membrane cell using 2.0 M NaOH solution, then in a pH 1.3 buffer solution p-bromophenylamine forms a diazoate with NaNO(2), and into the mixture the collected phenols were added to form azo-compound in a pH 13 buffer solution. The azo-compound can be adsorbed at the mercury electrode and yields a sensitive oscillopolarographic wave. Over the range 2.0x10(-8)-2.0x10(-5) M, the peak currents are linearly proportional to the concentration of phenols. The detection limit is 5.0x10(-9) M. |
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