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ZHAO Zhi-fei, REN Xiao-rong, LI Ce, GUO Zhao, SONG Juan-e, GONG Hua. Determination of Cadmium in Soil Samples by ICP-MS/MS Using Oxygen Reaction Mode[J]. Rock and Mineral Analysis, 2021, 40(1): 95-102. DOI: 10.15898/j.cnki.11-2131/td.202003150034
Citation: ZHAO Zhi-fei, REN Xiao-rong, LI Ce, GUO Zhao, SONG Juan-e, GONG Hua. Determination of Cadmium in Soil Samples by ICP-MS/MS Using Oxygen Reaction Mode[J]. Rock and Mineral Analysis, 2021, 40(1): 95-102. DOI: 10.15898/j.cnki.11-2131/td.202003150034

Determination of Cadmium in Soil Samples by ICP-MS/MS Using Oxygen Reaction Mode

More Information
  • Received Date: March 14, 2020
  • Revised Date: April 16, 2020
  • Accepted Date: August 23, 2020
  • Published Date: January 27, 2021
  • HIGHLIGHTS
    (1) Directly analysis 111Cd in soil samples by triple quadrupole ICP-MS oxygen reaction mode.
    (2) Optimized oxygen flow rate at 0.45mL/min, the interference of 2000μg/L Zr solution and 1000μg/L Mo solution to cadmium can be reduced to less than 0.005μg/L.
    (3) The method detection limit is 0.003μg/g, which can meet the trace cadmium analysis in soil samples.
    BACKGROUNDWhen using inductively coupled plasma-mass spectrometry (ICP-MS) to analyze soil, the zirconium hydroxide, molybdenum oxide, and tin isotopes can cause serious interference on cadmium, which makes it difficult to accurately determine cadmium in soil samples.
    OBJECTIVESTo develop a method for accurate determination of Cd in soil samples.
    METHODSICP-MS/MS was used, and 111Cd without isobaric interference was selected as the analysis line. In MS/MS mode, the oxygen introduced into the collision reaction cell can be reacted with 111Zr16O1H+, 111Mo16O+, inducing electron transfer, dehydrogenation, oxygenation and other reactions to inhibit the overlapping interference of these polyatomic ions on 111Cd.
    RESULTSOxygen flow was the key factor in this method. 0.45mL/min oxygen flow can reduce oxide interference to less than 0.005μg/L when zirconium concentration was lower than 2000μg/L and molybdenum concentration was below 1000μg/L. The method has been verified by the national reference materials. The relative error of the measured value and recognized value of the 11 national reference materials was within ±7%, and the relative standard deviation (n=12) of three soil reference materials was less than 5%.
    CONCLUSIONSTriple quadrupole ICP-MS oxygen reaction mode can eliminate Zr and Mo polyatomic ion interference on Cd, and this method can be used for the determination of trace Cd in soil samples.
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