Determination of gold, silver, platinum, palladium in waste circuit boards samples by flame atomic absorption spectrometry with microwave muffle furnace pretreatment
叶艳青1，羊 波1,2，杨新周1，李银科2，胡秋芬*1
1.Ｋey Laboratory of Chemistry in Ethnic Medicinal Resources,State Ethic Affairs Commission & Ministry
of Education, School of Chemistry and Biotechnology, Yunnan University of Nationnalities, Kunming 650500, China;
2. Faculty of Sciences, Yuxi Normal University, Yuxi 653100, China
Abstract：A novel method for the determination of gold, silver, platinum and palladium in waste circuit board samples was investigated in this paper by flame atomic absorption spectrometry with microwave muffle furnace pretreatment. 5.0 g of crashed waste circuit board samples was weighed and burned in microwave muffle furnace at 550 ℃ for 30 min to decompose organic matter. After the burning things were dissolved with aqua regia, gold, silver, platinum and palladium in the sample solution were determined by flame atomic absorption spectrometry. The detection limit of gold, silver, platinum and palladium was 0.078, 0.12, 0.15 and 0.15 mg/mL, respectively. The recoveries were between 90% and 108%. The method was applied to the same waste circuit board sample for 7 times. The relative standard deviations on the same day were between 2.2% and 2.9%, and the relative standard deviations on different day between 3.3% and 3.5%. The method was applied to the analysis of waste circuit board and the results were consistent with those obtained by microwave digestion inductively coupled plasma atomic emission spectrometry.
