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. Author manuscript; available in PMC: 2008 Jan 9.
Published in final edited form as: Anal Chim Acta. 2006 Aug 24;581(2):232–240. doi: 10.1016/j.aca.2006.08.032

Fig. 7.

Fig. 7

(A) Spectra of Cr(VI)-containing functionalized monoliths after exposure to diphenylcarbazide. Each gel had been previously exposed for 5 hours to a 20 mL solution consisting of 0.1 M HCl and: (a) 0 ppb; (b) 11 ppb; (c) 51 ppb; (d) 102 ppb; (e) 204 ppb; (f) 308 ppb Cr(VI). (B) The corresponding calibration plot. Data points represent an average of measurements from three gels.