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≥0.9984。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^-1,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.

戴犀尊(1997-),男,硕士生