Fig. 2From: Fast and simple selenium speciation by solid phase extraction and laser-induced breakdown spectroscopyThe signal intensity of Se (VI) from LIBS spectra. a Signal intensities of Se (VI) at different pH values (3.0, 5.0, 7.0, and 9.0) and b those at different flow rates (1.0, 2.0, 4.0, and 8.0 mL/min). A 10-mL solution was used for each analysisBack to article page