目前药品胶囊中六价铬的检测多通过实验室化学分析方法,精度虽高但难以满足现场检测的需求,针对此问题设计了一种可用于现场检测的痕量六价铬传感器.它包括化学敏感材料、光学激发模块与信号处理模块三部分,化学敏感材料将六价铬浓度转化为光信号,光学激发模块完成激光光源的稳定输出,信号处理模块实现微弱光信号的转换、放大、数据处理与检测结果的显示.实验通过制作的光电转换与信号处理电路完成痕量六价铬的快速检测,实现了检测仪器的小型化与现场检测.结果表明,在六价铬浓度10～500μg·L-1范围内传感器检测结果呈现良好的线性,拟合后的线性方程为Y=1.542 47*X-2.353 47,线性度为0.998 62,检测下限达到10 μg·L-1,传感器响应时间为90 s,实验中选取5份药用胶囊样品做了对比检测,结果表明该传感器定量检测数据可靠,满足了痕量六价铬低成本、快速、现场检测的需求.%Hexavalent chromium detection in medicine capsules is generally analyzed in the laboratory,it is difficult to meet the demand for field detection,and to address this problem,a sensor which can be used for on-site detection of trace amounts of hexavalent chromium was designed.It mainly includes chemically sensitive materials,optical sensing module and signal processing module,the chemical sensitive materials is to achieve the conversion of the hexavalent chromium concentration signal,the optical sensing module is to complete a stable output of the laser light source,and the signal processing module is to complete a photoelectric conversion of the weak fluorescence signal,signal amplification,and data processing and displaying.With using the indigenously developed photoelectric acquisition,conversion and signal processing system to complete the rapid detection of trace amounts of hexavalent chromium,so the miniaturization of testing instruments and on-site detection were achieved.Experimental results show that:the sensor detection results have a good linear relationship when the hexavalent chromium concentration is 10～500 μg · L-1,the linear equation is Y=1.542 47 * X-2.353 47,and the linearity is 0.998 62,the detection limit reaches 10 μg · L-1,the sensor response time is about 90 seconds,5 capsule samples were selected to do the contrast detection,and the results show that the sensor quantitative detection data is reliable,which meets trace hexavalent low cost,fast and field detection demands.
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