Use of peak area instrumental datum as possibility to improve the analytical sensitivity in the sequential voltammetric determination of ultra-trace iridium and lead in vehicle emission particulate matter

作者：Locatelli Clinio^*

来源：Microchemical Journal, 2013, 110: 99-106.

DOI：10.1016/j.microc.2013.02.012

• Iridium
• Lead
• Voltammetry
• Peak area
• Particulate matter
• Spectroscopy

The possibility of using peak area instead of peak height is proposed for analytical sequential determination in particulate matter of iridium(III) and lead(II), elements linked to vehicle emissions. %26lt;br%26gt;In the case of species present at ultratrace concentration level or having low reversibility degree of the electrodic processes, the employment of peak area, instead of peak current, permits to achieve limits of detection lower even more of one order of magnitude. %26lt;br%26gt;The method is based on the voltammetric catalytic current of the Ir(III)-bromate and Pb(II)-bromate systems on glassy carbon (GC) electrode, using 0.25 mol L-1 acetate buffer pH 4.3 + 7.7 x 10(-2) mol L-1 NaBrO3 + 0.2 mol L-1 KCl [Pb(II)] and 0.25 mol L-1 acetate buffer pH 4.3 + 7.7 x 10(-2) mol L-1 NaBrO3 + 0.2 mol L-1 KCl + 3.5 x 10(-5) mol L-1 cetyltrimethylammonium bromide (CTAB) [Ir(III)i as the supporting electrolytes. %26lt;br%26gt;For both elements, the accuracy, expressed as relative error e%, and the precision, expressed as relative standard deviation s(r)%, were satisfactory, being, generally, lower than 6%. %26lt;br%26gt;To better validate the analytical procedure, a comparison with spectroscopic (electrothermal atomic absorption spectroscopy, ET-AAS) is also reported.

• 出版日期2013-9