Determination of Heavy Metal Elements in Leaching Solution of Electrolytic Manganese Dioxide Waste Residue by Inductively Coupled Plasma-Tandem Mass Spectrometry

LI Tan-ping; WU Yi; ZENG Li-qun; LOU Xiao-ming; LI Ai-yang

doi:10.15898/j.cnki.11-2131/td.201911230162

LI Tan-ping, WU Yi, ZENG Li-qun, LOU Xiao-ming, LI Ai-yang. Determination of Heavy Metal Elements in Leaching Solution of Electrolytic Manganese Dioxide Waste Residue by Inductively Coupled Plasma-Tandem Mass Spectrometry[J]. Rock and Mineral Analysis, 2020, 39(5): 682-689. DOI: 10.15898/j.cnki.11-2131/td.201911230162

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Determination of Heavy Metal Elements in Leaching Solution of Electrolytic Manganese Dioxide Waste Residue by Inductively Coupled Plasma-Tandem Mass Spectrometry

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BACKGROUNDThe heavy metals in electrolytic manganese dioxide waste residue can cause different degrees of environmental pollution and hidden dangers to downstream aquatic ecosystems and agricultural ecosystems through surface runoff under rainwater leaching. Therefore, it is of great practical significance to determine the content of heavy metal elements in leaching solution of electrolytic manganese dioxide waste residue. Usually, the detection limits of atomic absorption spectrometry and inductively coupled plasma-optical emission spectrometry are insufficient to meet the measurement requirements, since the content of heavy metal elements in the leaching solution of electrolytic manganese dioxide waste residue is typically very low. The challenge is to eliminate complex spectral interference.OBJECTIVESTo find an efficient method for the determination of six heavy metal elements in leaching solution of electrolytic manganese dioxide waste residue.METHODSThe objective was determined by inductively coupled plasma-tandem mass spectrometry (ICP-MS/MS). The six heavy metal elements Cr, Ni, As, Cd, Hg and Pb in the electrolytic manganese dioxide waste residue were directly measured by ICP-MS/MS after H₂SO₄-HNO₃ mixed acid leaching. The O₂ reaction mode was adopted to eliminate the spectral interference of Cr, Ni, As and Cd during analysis. The background equivalent concentrations (BECs) of ⁵²Cr, ⁶⁰Ni, ⁷⁵As and ¹¹¹Cd in the different analytical mode were investigated to evaluate the influence of spectral interference on the analysis results.RESULTSIn the MS/MS mode, O₂ was selected as the reaction gas, and the spectral interference of ⁵²Cr, ⁶⁰Ni, ⁷⁵As and ¹¹¹Cd was eliminated by using mass shift method and on-mass method. The limits of detection for Cr, Ni, As, Cd, Hg and Pb were 3.06, 9.31, 3.50, 2.72, 2.03, 1.89ng/L, respectively. The spiked recoveries were between 95.6% and 106.2%. The relative standard deviation was no higher than 3.9%.CONCLUSIONSThe method has been successfully applied to the determination of heavy metal elements in leaching solution of electrolytic manganese dioxide waste residue.

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Determination of Heavy Metal Elements in Leaching Solution of Electrolytic Manganese Dioxide Waste Residue by Inductively Coupled Plasma-Tandem Mass Spectrometry

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