1. College of Earth Sciences and Land Resources, Chang’an University, Xi’an 710054, China
2. Laboratory of Mineralization and Dynamics, Chang’an University, Xi’an 710054, China
Abstract:In this work, nine heavy metals (Cr, Co, Ni, Cu, Zn, Zr, Cd, Ba and Pb) and sixteen rare earth elements in waste incineration were determined by ICP-MS combined with a high-pressure closed digestion method. The samples were completely decomposed by a mixture of acid of HF-HNO3-HCl (1∶2∶1) at 185 ℃ in high-pressure sealed bombs and a digestion time of 12 h. The operating conditions for ICP-MS (such as temperature of spray chamber, nebulizer gas flow rate, auxiliary gas flow rate, cooler gas flow rate and sampling depth) were also optimized. Here, with Rh as the standard internal element, the obtained linear calibration plots of the studied 25 elements showed relative coefficients (r) were higher than 0.999 9, and the corresponding detection limits were within 0.001~1.01 ng·g-1. This proposed method’sdetermination relative standard deviations (RSDs) for waste incineration samples were less than 4.5% (n=3). Results showed that heavy metals of Cr, Cu, Zn, Zr, Cd, Ba and Pb were relatively high in the studied waste incineration samples, with Pb concentrations as high as (1 459±8) mg·kg-1. While the average total REEs was (199±2) mg·kg-1 with a decreasing trend and enrichment of light REEs. The successful application of this high-pressure closed digestion ICP-MS method to heavy metals and REEs quantification in waste incineration samples is of valuable guidance in the subsequent waste disposal, and future metal recycling.
Key words:High-pressure closed digestion; ICP-MS; Heavy metal; REEs; Waste incineration
依力扎提·居马洪,谭细娟,梁 婷,周 义. 高温高压密闭消解-ICP-MS测定垃圾焚烧残渣中重金属及稀土元素[J]. 光谱学与光谱分析, 2022, 42(10): 3168-3173.
JUMAHONG Yilizhati, TAN Xi-juan, LIANG Ting, ZHOU Yi. Determination of Heavy Metals and Rare Earth Elements in Bottom Ash of Waste Incineration by ICP-MS With High-Pressure Closed
Digestion Method. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3168-3173.
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