| In order to meet the rapid determination requirements of chemical components in alloy gold, the determination method of platinum by spark emission spectrometry was developed. The sample was prepared by a milling method. The optimized spark excitation conditions were as follows: 1000 V of voltage setting, 3 sec of flush time, 10 sec of pre-burning time, 5 sec of integral time, and 3.5 L/min of argon flow. Line 319.80 nm was used as a reference line，and the spectral line of Pt 265.95 nm was selected as the analytical line. Platinum element has a good linear relationship with the emission intensity in the concentration range of 0.0002%~0.105%, and the correlation coefficient is greater than 0.999. The precision tests were performed using purchased certified reference gold materials with high and low contents, and the relative standard deviation (RSD, n=6) of platinum was between 1.3% and 7.4%. The unknown alloy gold samples were used for accuracy tests, and the measured platinum contents were consistent with those obtained by ICP-AES. Besides, the stability of the instrument was verified by drift calibration. |
