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China Surfactant Detergent & Cosmetics ›› 2020, Vol. 50 ›› Issue (3): 208-212.doi: 10.3969/j.issn.1001-1803.2020.03.013

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Determination of cadmium in ferric oxide pigments by ICP-OES

Hao-jie HUANG,Fei-fei XU   

  1. Yi Wu Inspection and Quarantine Academy of Science and Technology, Yiwu, Zhejiang 322000, China
  • Received:2019-07-12 Revised:2020-01-15 Online:2020-03-22 Published:2020-04-02

Abstract:

Cd214.439, Cd226.502 and Cd228.802, commonly used in determination of cadmium in ferric oxide pigments by ICP-OES, are interfered by the iron spectrum. By using rhodium as the internal standard, the interference at these three spectral lines in the mass concentration range of 0-20.0 g/L of iron was studied. The results showed that, iron interfered most at Cd226.502, next at Cd214.439, and least at Cd228.802. The interference values ranged from 0.130-1.430 mg/L, 0.031-0.329 mg/L, and 0.005-0.025 mg/L, respectively. At Cd226.502 and Cd214.439, the interference intensity grew with the increase of iron mass concentration, but not so much at Cd228.802. Finally, Cd228.802 was selected for screening analysis. The sample was weighed as 0.500 g, which could be judged as qualified when the test result was less than or equal to 5.0 mg/kg, and unqualified when the test result was more than 6.2 mg/kg. Only when the test result was somewhere in between, other methods would be used for analysis and confirmation. Therefore, the selection of Cd228.802 for analysis could greatly improve the screening efficiency.

Key words: ICP-OES, ferric oxide pigment, cosmetic, cadmium

CLC Number: 

  • TQ658