Direct Zinc Determination in Brazilian Sugar Cane Spirit by Solid-Phase Extraction Using Moringa oleifera Husks in a Flow System with Detection by FAAS

Table 1

Conditions for preconcentration of zinc and analytical response for the study of multivariate optimization using SPE with detection by FAAS.

Run	Sorbent mass (mg)	pH	Sample flow rate (mL min^−1)	Eluent concentration (mol L^−1)	Integrated; absorbance
1	30	4.0	3.0	0.5	0.4473
2	60	4.0	3.0	0.5	0.4806
3	30	9.0	3.0	0.5	0.3160
4	60	9.0	3.0	0.5	0.3926
5	30	4.0	6.0	0.5	0.4136
6	60	4.0	6.0	0.5	0.4430
7	30	9.0	6.0	0.5	0.4473
8	60	9.0	6.0	0.5	0.4358
9	30	4.0	3.0	1.5	0.3780
10	60	4.0	3.0	1.5	0.1696
11	30	9.0	3.0	1.5	0.2877
12	60	9.0	3.0	1.5	0.2055
13	30	4.0	6.0	1.5	0.4236
14	60	4.0	6.0	1.5	0.4277
15	30	9.0	6.0	1.5	0.4894
16	60	9.0	6.0	1.5	0.4864