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 2

Absorbance/concentrations of the samples from aeration chamber, clarifier, chlorine chamber, and sulfur dioxide chamber spiked with 5, 10, and 15 mL of 0.5 ppm Cr(VI) standards. A 2550 UV-Vis spectrophotometer was used for measurements at λ = 540 nm.

(a) Aeration chamber

(b) Clarifier

(c) Chlorine chamber

(d) Sulfur dioxide chamber