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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: J Anal At Spectrom. 2019 Feb 25;34(4):741–752. doi: 10.1039/C8JA00423D

Figure 2.

Figure 2

Concentrations of Cd and Pb are plotted in 1) acid-washed Sarstedt autosampler vials (AW-Sarstedt); 2) untreated VWR tubes (UT-VWR); and 3) acid-washed VWR tubes (AW-VWR). For each group, the individual data points (filled circles) are shown along with the mean ± 95% CI.