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. Author manuscript; available in PMC: 2008 Apr 30.
Published in final edited form as: Am Lab. 2007 May;39(10):37–41.

Figure 2.

Figure 2

Square-wave voltammograms of various Cr(VI) concentrations collected at a 4-[2-(trimethoxysilyl)ethyl]-pyridine-functionalized sol-gel electrode: (a) 0 ppb; (b) 1.1 ppb; (c) 10.7 ppb; (d) 48.4 ppb; (e) 98.5 ppb; (f) 198 ppb.