原子荧光光度计

非色散原子荧光光度计是用由光源发出的特征辐射光照射在被测元素的原子蒸气上，基态原子被激发到高能级，当以辐射去活化返回基态时，辐射出荧光的原理，来进行定量分析的。其荧光强度与元素的浓度存在以下关系: If=φl0(1-e- KλLN)。对于给定的元素来说，当光源的波长和强度固定，吸收光程固定，原子化条件一定，在元素浓度较低时，荧光强度与荧光物质的质量浓度P有如下简单的关系 (a为常数): If =αρ。非色散原子荧光光度计可用于易形成氢化物的元素，易形成气态组份的元素和易还原成原子蒸气的元素的测量。为了向福建省全省提供公正准确权威的原子荧光光度计的第三方校准数据，特开展此校准项目。本项目的计量标准由：检定装置由空心阴极灯和砷、锑单元素溶液标准物质等组成。 利用空心阴极灯和砷、锑单元素溶液标准物质检测仪器检出限及线性误差等。目前我院的最佳测试能力为：As：Urel=1%，k=2；Sb：Urel=1%，k=2。

The non-dispersive atomic fluorescence spectrometer conducts quantitative analysis based on the principle that characteristic radiation emitted by a light source irradiates the atomic vapor of the analyte, where ground-state atoms are excited to high energy levels and then emit fluorescence when returning to the ground state via radiation deactivation. There is a relationship between the fluorescence intensity and the element concentration: $I_f = phi I_0(1-e^{-Klambda LN})$. For a given element, when the wavelength and intensity of the light source are fixed, the absorption path length is fixed, and the atomization conditions are constant, at low element concentrations, the fluorescence intensity has a simple relationship with the mass concentration $
ho$ of the fluorescent substance (where $alpha$ is a constant): $I_f = alpha
ho$.

The non-dispersive atomic fluorescence spectrometer can be used for the measurement of elements that easily form hydrides, elements that readily form gaseous components, and elements that can be easily reduced to atomic vapors.

This calibration project is carried out to provide impartial, accurate and authoritative third-party calibration data for atomic fluorescence spectrometers across Fujian Province.

The metrological standard for this project consists of a calibration device composed of hollow cathode lamps, certified single-element solution reference materials of arsenic (As) and antimony (Sb), and other relevant components. The detection limit and linear error of the instrument are tested using hollow cathode lamps and certified single-element solution reference materials of arsenic and antimony.

The current optimal testing capability of our institute is as follows: For As: $U_{rel}=1\%$, $k=2$; For Sb: $U_{rel}=1\%$, $k=2$.