Abstract：Under acidic, low-temperature conditions, the sample was dissolved directly in water, and under the selected measurement conditions, calcium and magnesium contents in manganese sulfate were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). According to the spectra, the background profile and the intensity values, the experiment selected spectral lines Ca 317.9 nm and Mg 285.2 nm as the analytical lines for calcium and manganese for the high signal-to-background ratio, were not or less affected by spectral interference and showed low detection limits so that the interference of matrix element manganese with the determination of calcium and magnesium was eliminated. The linear correlation coefficients of the calibration curves for calcium and magnesium were 0.999 7 and 0.999 5, respectively, the detection limits were 0.007 μg/mL and 0.002 μg/mL, and the lower limits of quantification were 0.022 μg/mL and 0.007 1 μg/mL, respectively. The same sample was determined independently eight times to obtain the relative standard deviations (RSD) as 0.78% (Ca) and 0.93% (Mg). The standard recovery of the method was between 97% and 101%. The measured values of the sample were consistent with those obtained by titration method, but the proposed method is relatively simple to operate, exhibits good sensitivity and precision and thus is suitable for the determination of calcium and magnesium contents in manganese sulfate.
