一种检测西维因农药残留的光纤式荧光光谱系统的研究

Study on A Fiber-Optic Fluorescence Spectrum System forDetecting Carbaryl Pesticide Residues

根据西维因农药能够受激发荧光的光谱特性,研制了一种光纤式西维因农药残留检测系统.该系统采用单光源、测量与参考双通道结构,具有抑制干扰能力.采用自己设计的筒式光纤探头激发并探测荧光,设计了相应的信号处理电路,实现了微机化管理.它不仅可以测量西维因农药残留量,而且通过改变仪器的有关参数后可以测量其他物质的含量.实验表明,在激发波长280nm、荧光波长340nm下,最小检测浓度为2.7μg/L,西维因浓度范围在2.7～120μg/L之间时系统具有较好线性关系(S/N=5).该系统达到了荧光检测的指标.

A fiber-optic fluorescence spectrum system is described for detecting carbaryl pesticide residues, which is based on the characteristic that carbaryl can emit fluorescence as it is excited by ultraviolet radiation. The system adopts a kind of configuration of a single light-source, dual light-paths with the functions of detection and reference which have an interference-free capability, uses a cylindrical optical fiber detector designed by ourselves to excite and detect fluorescence, designs the corresponding signal processing circuits, and realizes the microcomputer management.The system can not only detect carbaryl residues, but can detect other residues as well by modifying its some parameters. The experimental results indicate a good linear relationship with analyte concentration in the range of 0～120 μg/L for carbaryl and the detecting limit is 2.7 μg/L as excitation wavelength is 280 nm and emission wavelength is 340nm. It is proved that the system reaches the index of fluorescence detecting.