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

Table 4

Analysis of reference materials.

Sample	Proposed method Cr(III) (mg·L^−1)	Certified value Cr(III) (mg·L^−1)
River water–1071	100.38 ± 0.014	100.00 ± 0.5
River sediment–1066	299.57 ± 0.006	300.00 ± 0.5