基于微型光谱仪的总磷监测仪设计

Design of total phosphorus monitor based on miniature spectrometer

以总磷参数为研究对象,研发了一种基于微型光谱技术的水质在线监测仪。采用嵌入式技术,基于紫外光谱检测原理,利用最小二乘法建立了回归模型,绘制了总磷参数的浓度-吸光度标准工作曲线。实验结果表明,在0~50 mg/L量程范围内,其拟合优度≥0.998 4。对配置的不同浓度的总磷标准溶液进行检测,相对标准偏差(RSD)为2.20%~2.65%;直线性为1.08%~3.51%;相对误差为5.67%~7.01%。实验结果与国标法相对比无明显差别。该监测仪具有实时性好、稳定性高等特点,为水质在线监测提供技术支持,尤其适用于站房式、浮标式水质监测。

Taking total phosphorus parameters as the research object, an online water quality monitor based on micro-spectral technology is developed.The monitor adopts an embedded technology, based on the principle of ultraviolet spectrum detection.A regression model is established by means of the least square method, and the concentration-absorbance standard working curve for total phosphorus parameters is drawn.Experimental results show that in the range of 0-50 mg·L,the goodness of fit exceeds 0.998 4.The monitor is used to detect the prepared total phosphorus standard solutions with different concentrations, the relative standard deviation(RSD) is 2.20%-2.65%,the linearity is 1.08%-3.51%,the relative error is 5.67%-7.01%,and there is no obvious difference between this method and national standard method.The monitor shows good real-time performance and high stability characteristics.It can provide technical support for on-line water quality monitoring, especially for station-room and buoy water quality monitoring.