Journal of Analytical Methods in Chemistry / 2011 / Article / Tab 1 / Research Article
Determination of Low Levels of Lead in Beer Using Solid-Phase Extraction and Detection by Flame Atomic Absorption Spectrometry Table 1 Conditions for Pb(II) preconcentration and the analytical response for the multivariate optimization study using SPE with the Moringa oleifera column and detection by FAAS.
Run Adsorbent mass (mg) Particle size (μ m) Preconcentration Flow rate (mL min−1 ) Eluent flow rate (mL min−1 ) pH Eluent concentration (mL min−1 ) Integrated absorbance 1 30 (−1) 850 (−1) 2.0 (−1) 1.0 (−1) 2.0 (−1) 0.5 (−1) 0.1261 2 80 (+1) 850 (−1) 2.0 (−1) 1.0 (−1) 8.0 (+1) 0.5 (−1) 0.0304 3 30 (−1) 180 (+1) 2.0 (−1) 1.0 (−1) 8.0 (+1) 2.0 (+1) 0.0000 4 80 (+1) 180 (+1) 2.0 (−1) 1.0 (−1) 2.0 (−1) 2.0 (+1) 0.2315 5 30 (−1) 850 (−1) 6.0 (+1) 1.0 (−1) 8.0 (+1) 2.0 (+1) 0.3796 6 80 (+1) 850 (−1) 6.0 (+1) 1.0 (−1) 2.0 (−1) 2.0 (+1) 0.0092 7 30 (−1) 180 (+1) 6.0 (+1) 1.0 (−1) 2.0 (−1) 0.5 (−1) 0.0000 8 80 (+1) 180 (+1) 6.0 (+1) 1.0 (−1) 8.0 (+1) 0.5 (−1) 0.0117 9 30 (−1) 850 (−1) 2.0 (−1) 4.0 (+1) 2.0 (−1) 2.0 (+1) 0.3674 10 80 (+1) 850 (−1) 2.0 (−1) 4.0 (+1) 8.0 (+1) 2.0 (+1) 0.0141 11 30 (−1) 180 (+1) 2.0 (−1) 4.0 (+1) 8.0 (+1) 0.5 (−1) 0.0000 12 80 (+1) 180 (+1) 2.0 (−1) 4.0 (+1) 2.0 (−1) 0.5 (−1) 0.0093 13 30 (−1) 850 (−1) 6.0 (+1) 4.0 (+1) 8.0 (+1) 0.5 (−1) 0.0143 14 80 (+1) 850 (−1) 6.0 (+1) 4.0 (+1) 2.0 (−1) 0.5 (−1) 0.0000 15 30 (-1) 180 (+1) 6.0 (+1) 4.0 (+1) 2.0 (−1) 2.0 (+1) 0.0000 16 80 (+1) 180 (+1) 6.0 (+1) 4.0 (+1) 8.0 (+1) 2.0 (+1) 0.0330
