Advances in Environmental Chemistry / 2016 / Article / Fig 5

Research Article

Determination of Hexavalent Chromium (Cr(VI)) Concentrations via Ion Chromatography and UV-Vis Spectrophotometry in Samples Collected from Nacogdoches Wastewater Treatment Plant, East Texas (USA)

Figure 5

((a)–(d)) UV-Vis spectra of samples spiked with 5, 10, and 15 mL of 0.5 ppm Cr(VI) standard solution from the four treatment stages: aeration, clarifier, chlorination chamber, and sulfur dioxide chamber.
(a) Aeration chamber
(b) Clarifier
(c) Chlorination chamber
(d) SO2 chamber