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. Author manuscript; available in PMC: 2006 Oct 17.
Published in final edited form as: Anal Chim Acta. 2006 Mar 15;562(2):229–235. doi: 10.1016/j.aca.2006.01.065

Fig. 1.

Fig. 1

Calibration lines of Cr(VI) in the range 0–200 μg l−1 in elution buffer with the extraction of Cr(VI)–DPC in 1-butanol measuring absorbance at 545 nm (○), and following the NIOSH 7703 protocol measuring absorbance at 540 nm (▪). The figure also shows Pearson’s r-value, the intercept and the slope of the lines with their S.D.s.