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研究了应用氢化物发生-原子荧光光谱法联合测定面粉中砷和汞,该方法灵敏度高、准确度好。在最佳条件下,以50g/L硫脲+50g/L抗坏血酸为预还原剂,荧光强度与砷浓度在0.0378ng.mL-1～100ng.mL-1范围内呈线性关系,检出限达0.0378 ng.mL-1,荧光强度与汞浓度在0.0227ng.mL-1～50ng.mL-1范围内呈线性关系,检出限达0.0227 ng.mL-1;测定8个面粉样品中砷、汞,相对标准偏差:砷为1.68以下,汞为1.82以下;回收率:砷为90.9%～113.2%,汞为92.4%～107.7%。
The determination of arsenic and mercury in flour by hydride generation - atomic fluorescence spectrometry was studied. The method has high sensitivity and good accuracy. Under the optimal conditions, the fluorescence intensity was linear with the concentration of arsenic in the range of 0.0378ng.mL-1 ~ 100ng.mL-1 with 50g / L thiourea + 50g / L ascorbic acid as the prereduction reducing agent. The detection limit The fluorescence intensity was linear with the concentration of mercury in the range of 0.0227ng.mL-1 ~ 50ng.mL-1, with the detection limit of 0.0227ng.mL-1. The arsenic, Mercury, relative standard deviation: arsenic was 1.68 or less, mercury was 1.82 or less; recovery: arsenic 90.9% to 113.2%, mercury 92.4% to 107.7%.