Selective Extraction and Determination of Chromium Concentration Using Luffa cylindrica Fibers as Sorbent and Detection by FAAS

Table 3

Relative recovery for the six samples of isotonic and energy drinks submitted to the proposed method.

Sample	Cr(III) mg·L^−1		Recovery (%)
	Added	Found
Isotonic drink 1	0.50	0.53 ± 0.0069	107.35
Isotonic drink 2	0.50	0.50 ± 0.0012	100.61
Isotonic drink 2	0.50	0.51 ± 0.0006	102.55
Energy drink 1	0.50	0.48 ± 0.0056	96.400
Energy drink 2	0.50	0.520 ± 0.0007	104.01
Energy drink 3	0.50	0.438 ± 0.0045	87.60