HK-8100 single-channel scanning spectrometer to measure metal platinum - Huaqiang Electronic Network

Platinum group elements have similar electronic layer structure and chemical properties, so that many reagents can react with various platinum group elements at the same time and cause mutual interference. It is difficult to find special reagents, so separation and measurement are very difficult. China's precious metals industry to determine the purity of sponge platinum by DC arc emission spectroscopy or imported inductively coupled plasma atomic emission spectrometer. At present, in the analysis standard of pure platinum and high-purity platinum in China's Ministry of Metallurgical Industry, the standard sample series is manually prepared, and the impurities in the platinum sample are determined by DC arc excitation. This method uses a domestic HK-8100 single pass scanning inductively coupled plasma emission spectrometer to detect high purity sponge platinum. Experimental part: Instrument and reagent: HK-8100 single pass scanning inductively coupled plasma optical emission spectrometer. The reagent is a pure grade instrument working condition: the power is l kw, the cooling gas flow rate is 600 L·h~, the carrier gas flow rate is 20 L·h-1, and the sample liquid suction rate is 2.0 mL·min-1. Test method Weigh sponge platinum o. 500Og, add 30 mL of concentrated hydrochloric acid, 10 mL of concentrated nitric acid, dissolve by heating, concentrate, and dilute to 50 mL. According to the industry standard method [3], the types of sponge platinum impurity elements are determined. They are divided into two groups according to the standard solution medium. The first group is bismuth, aluminum, gold, lead and silver, and the second group is copper, iron and nickel. Helium, palladium, and o. 5 mg·L-1 and 5 mg·L-1 high and low standard solutions. The impurity element content of the sample was found on the standard curve. Results and discussion Analysis performance of domestic HK-8100 inductively coupled plasma optical emission spectrometer The range of analysis of various elements in the wavelength range is mostly in the wavelength range of 190-500 mn. This experiment scans the short-wave end 202.548nm zinc and long-wave end 493. The line profile of .409 nm钡 has a symmetrical good peak shape, and the peak height (strength) is repeated and stable, indicating that the spectrometer is stable in the range of 190-500 nm and can be used normally. The detection limit test tested the detection limits of three lines of nickel 221.647nm, iron 238.204nm and copper 324.754 nm, three times the standard deviation of the 11 signals of the blank solution at the three spectral positions. The sensitivity of the standard solutions of these three elements at known concentrations is calculated on the sensitivity of these three lines. The results show that the detection limits of these three elements are all recognized limits of the literature. The precision and stability of the measurement is 10 mg. · L ^-1 calcium and magnesium standard solution for measuring the intensity of calcium 393.366 nm and magnesium 279.553 11nm each 10 times, the relative standard deviation of the calculated line intensity is 1.3% and 1.8%, respectively. It shows that the short-term stability of the spectrometer works well. The intensity of magnesium was measured every 5 min at 279.553 nm, and 12 times in 1 h. The relative standard deviation of the intensity measurement was 1.9%, indicating that the long-term stability of the spectrometer was good.