Table 3: Comparison of Cr(VI) concentrations to other literature studies in river, wastewater, and drinking waters.

Samples[Cr(VI)] amountsReference

River samples 3.7–3.31 ppb [7]
4.2 ppb[8]
Below detection limits [9]
0.03–2 ppb [10]
0.097–9.84[11]
31–498 ppm (in lakes)[12]
21–984 ppm (in tap water)[12]

Wastewater samples25.1–45.5 ppb[13]
1.2–6.7 ppm [14]
567.2 ppb[15]
4–9 ppbThis study

Drinking water samples0.12–20 nM[16]
14 nM[16]
0.3–1.0 ppb[17]