Based on inductively coupled plasma tandem mass spectrometry (ICP-MS/MS), the interference-free determination of 10 harmful metal elements in perlite was established. After microwave digestion of the perlite sample with a mixed solvent HNO3+HCl+HF, the harmful metal elements Be, Cr, Co, Ni, As, Cd, Sn, Sb, Hg, and Pb were determined by ICP-MS/MS. In the MS/MS mode, NH3/He and O2 were selected as the reaction gases. The NH3/He and O2 mass shift method were used to eliminate the spectral interference during the determination of Cr, Co, Ni, As, and Cd. NH3/He on-mass method was used to eliminate the spectral interference during Cd measurement. The accuracy of the method proposed was evaluated by analysis of national standard reference material rock (GBW07106). In the linear range of 0-50 μg/L, the linear correlation coefficient of the analysis element was ≥ 0.999 6; Limit of detection (LOD) for analytes ranged from 0.52 to 7.36 ng/L, and the method detection limit (MDL) ranged from 0.26 to 3.68 ng/g; At a 95% confidence level, no significant differences were found between the results obtained via ICP-MS/MS and the certified values. The relative standard deviation (RSD) was ≤ 6.02%. The newly developed method has a good linear relationship, low LOD, high accuracy and excellent precision. It could be used for the determination of 10 harmful metal elements in food filter aid perlite.
LI Tanping
,
LOU Xiaoming
,
LI Aiyang
. Determination of harmful metal elements in food filter aid perlite by inductively coupled plasma tandem mass spectrometry[J]. Food and Fermentation Industries, 2020
, 46(10)
: 242
-247
.
DOI: 10.13995/j.cnki.11-1802/ts.023512
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