Fig. 2.
The effect of injected sample volume (10–100 μL) on the absorption signal for 5 μg/mL Cr(VI) using micro-injection of the discrete samples.
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In Fig. 3a, the signals obtained for standard solutions of 0.5–50 μg/mL Cr are shown. The applied sample volume was 30 μL using micro-injection of the discrete samples. From these data, a 0.0089 μg/mL limit of detection (LOD) and a linear detection range of 0.2–50 μg/mL could be concluded. Fig. 3b shows the signals of a number of 30 μL samples containing 4 μg/mL Cr as an example of the reproducibility and the time consumption of the measurements (approximately 20 samples/min). The relative standard deviations (N = 12) amounted to 2.9% and 3.8% in signal height and signal area, respectively.