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通过对氨基甲酸酯类农药在紫外光照射下能够产生荧光的机理研究,设计了一种用于检测氨基甲酸酯类农药残留的荧光系统。该系统采用单光源、双光路结构,能够对测量信号和参考信号同时进行处理。采用所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,实现了计算机管理。利用该系统和稳态光谱仪对西维因进行了对比实验。结果表明:在激发波长为319nm、荧光波长为654nm时,最小检测浓度为5×10-7μg/L。当西维因浓度范围在0.0～120.0μg/L之间时,系统具有较好的线性关系,线性相关系数r=0.9996(信噪比S/N=5)。该系统达到了荧光检测的指标。
By studying the mechanism of the fluorescence of carbamate pesticides under ultraviolet light irradiation, a fluorescent system for detecting residues of carbamate pesticides was designed. The system uses a single light source, dual optical structure, the measurement signal and reference signal can be processed simultaneously. Using the designed tube-type fiber probe to excite and detect fluorescence, the corresponding signal processing circuit is designed and the computer management is realized. The system and steady-state spectrometer were used to compare the effect of Cimetidine. The results showed that the minimum detection concentration was 5 × 10-7μg / L at the excitation wavelength of 319nm and the fluorescence wavelength of 654nm. The system has a good linearity when the concentration of CIV is in the range of 0.0 ~ 120.0μg / L with linear correlation coefficient r = 0.9996 (signal to noise ratio S / N = 5). The system has reached the target of fluorescence detection.