Determination of Arsenic Content in High-salt Food Matrices
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Abstract:
A matrix matching-dynamic reaction cell-inductively coupled plasma mass spectrometry method for determining the arsenic content in high-salt food matrices was established, to solve the mass spectrum interference and matrix interference of a high-salt matrix on arsenic determination. The key technical points for the determination of total arsenic in foods by inductively coupled plasma mass spectrometry and hydride generation atomic fluorescence spectrometry were investigated. A method for determining the arsenic in high-salt food matrices was established through analyzing the effects of pretreatment and digestion methods, organic matrix, chlorine content and internal standard correction elements on the determination of arsenic content. The experimental results show that the microwave digestion method is not quite suitable for the determination of total arsenic in food by hydride generation atomic fluorescence spectrometry. The organic matrix and chlorine will produce a sensitizing effect and mass spectral interference on the mass spectrometry signal of arsenic, respectively. 74Ge is more suitable than 72Ge as an internal standard element for the determination of total arsenic in food by inductively coupled plasma mass spectrometry. LOQ of the established method was 0.010 mg/kg, recovery rate of arsenic in high-salt matrices was 91.50%~110.80% when the addition level was 0.010, 0.025, 0.20 or 0.50 mg/kg, and the relative standard deviation range was 0.76%~7.22%. The statistical values of the sample analysis results obtained by this method and the reference method were both higher than t0.90,10 (1.81, bilateral), and there is a significant difference in the determination results. The measurement results of actual samples revealed that the kinetic energy discrimination measurement model is not suitable for the determination of total arsenic in high-salt food matrix samples. The method is accurate and reliable, and can be applied for the determination of arsenic content in high salt-and high-matrix foods.
