استخدام معدلي ركازة من حمض الأزوت وحمض الكبريت في تحديد نزر عنصر الرصاص في مياه البحر تحديداً مباشراً باستخدام تقانة الـ ETA-AAS

This study deals with the effect of a series of concentrations of nitric acid and sulfuric acid on atomic absorption signal of trace Pb-element in seawater in order to determine the optimal concentration of the two studied acids used as matrix modifiers. The thermal study is done in order to determine the optimal temperature of ashing and atomizing stages for the direct determination of trace Pb-element in sweater depending on standard additions method for GF and GF-PFT technique with deuterium corrector. The results show a sensitivity of 12.4pg/0.0044abs in the presence of 1.3M HNO3 as matrix modifier for GF-technique, and 11.8pg/0.0044abs in the presence of 1.6M HNO3 as matrix modifier for GF-PFT technique. This method allows determining the trace of Pb-element directly in seawater. On the contrary, using a sulfuric acid as a matrix modifier is not successful.