微波消解-氢化物发生-原子荧光光谱法测定海贝中锌

HG-AFS Determination of Zinc in Sea Shellfishes with Microwave Assisted Sample Digestion

以硝酸和过氧化氢作为消解体系,采用微波消解-氢化物发生-原子荧光光谱法对4种海贝中微量锌进行测定,在优化的试验条件下,荧光强度与锌的质量浓度在600μg·L^(-1)以内的浓度范围内呈线性关系。检出限(3s/k)为0.66μg·L^(-1)。应用此法分析了4种海贝样品,并以此4种样品为基体做加标回收试验,回收率在92.2%～101.9之间。

Microamounts of zinc in four kinds of sea shellfishes were determined by hydride generation atomic fluorescence spectrometry. The sample was digested with HNO3 and H2O2. Under the optimized conditions, linear realationship between the values of fluorescence intensity and mass concentration of Zn^2＋ ion was obtained in the range within 600 μg·L^-1, with detection limit （3s/k） of 0. 66μg·L^-1. The proposed method was applied to the determination of micro amounts of zinc in 4 samples of shellfishes. Using these samples as matrixes, tests for recovery were made by standard addition method and values of recovery found were in the range of 92. 2% -- 101.9%.