The Method Study on Determination of Chlorine in Geochemical Samples by Wavelength Dispersive X-ray Fluorescence Spectrometry with Pressed Powder

Based on comparing the existing correlation analysis methods,A method for the determination of chlorine in geochemical samples by wavelength dispersion X-ray fluorescence spectrometry with pressed powder was established. Seventy eight types of national first-class geochemical standard substances including rock, sediment and soil were used as calibration series to establish calibration curves.The matrix effect was corrected by empirical coefficient method, and the spectra overlapping interference was corrected by content correction method.This paper summarizes the variation rule and reason of the measured values of chlorinewith the determination times in geochemical samples. The results indicated that detection limit of chlorine was 7.95 μg/g; three national first-class geochemical reference materials were analyzed twelve times, the relative standard deviations (RSD) were less than 10%; The accuracy of the method was verified by the national first-class geochemical reference materials, and the measured values were consistent with the certified values of the reference materials, the absolute values the logarithm difference between the measured average values and certified values of reference materials were all less than or equal to 0.02. The proposed method could meet the requirements of multi-objective regional geochemical survey specifications.