Determination of fluorine in copper ore using laser-induced breakdown spectroscopy assisted with SrF molecular emission band
The widely applied copper metal is mainly produced by smelting the copper ore, in which fluorine (F) is one of the harmful elements. Therefore, the F content has become a mandatory test index for copper ore. The low excitation efficiency, complex and serious spectral interference makes it difficult to detect F element in copper ore using atomic emission spectroscopy of laser-induced breakdown spectroscopy (LIBS). To address it, the SrF molecular emission bands were investigated to improve the analytical capabilities of LIBS for the determination of trace F in copper ore. The results demonstrated that SrF molecular emission band has a significant accuracy calibration model (R2=0.9933), high detective sensitivity (5 ppm), high analytical accuracy (RMSECV =0.0049 wt.%), and high analytical precision (6.64 wt.%) for detection of F in copper ore. SrF molecular emission bands in LIBS show great potential for F determination in copper ore industry. Furthermore, the mechanism of emission spectrum for SrF molecular was also discussed.