光谱学与光谱分析, 2021, 41(2): 612, 网络出版: 2021-04-08

顺序注射-连续光谱测定水质多参数方法研究

Sequential Injection-Continuous Spectroscopy Based Multi-Parameter Method for Water Quality Analysis
作者单位
摘要
针对水质多参数监测仪器的低功耗、 微型化、 集成化和智能化, 研制了一种基于顺序注射分析技术(SIA)和连续光谱检测方法融合的微型测定原位水质多参数检测仪, 系统设计的核心在于消解池结构设计且消解池作为检测池, 以及微控技术顺序注射平台的原理设计和多参数联合消解测定流程设计。 对融合SIA和连续光谱水质多参数原位分析的新方法进行实验研究。 设计了基于国标水质检测标准的多参数顺序注射分析检测流程, 基于分光光度检测方法, 在使用连续光谱扫描测量的条件下, 融合顺序注射分析技术对亚硝酸盐氮、 硝酸盐氮、 总氮、 总磷的含量进行检测。 测定消解前, 对硝酸盐氮、 亚硝酸盐氮进行直接光谱测量, 测定消解后对总氮进行光谱检测, 显色反应后, 对总磷进行光谱检测。 在本系统下, 以亚硝酸盐氮、 硝酸盐氮、 总磷和总氮原位水质参数为测定对象, 基于连续光谱分析, 最小二乘法建立回归模型并绘制各参数的浓度-吸光度标准工作曲线, 其拟合优度(即决定系数)≥0.989 9。 配制已知亚硝酸盐氮、 硝酸盐氮、 总氮、 总磷含量的混合溶液, 按照上述的多参数检测流程, 利用本系统绘制出的标准工作曲线测量4个参数, 实验结果表明, 实验参数重复性(相对标准偏差)RSD≤3.86%, 系统可稳定、 高效的分析不同水样中的亚硝酸盐氮、 硝酸盐氮、 总氮、 总磷含量。 基于SIA-连续光谱融合测定原位水质多参数检测方法研究, 对于提升在线水质监测仪器的技术性能具有重要作用, 微型多参数水质监测仪的研制具有良好的参数扩展前景, 适用于多种水质在线监测平台。
Abstract
Aiming at the low power consumption, miniaturization, integration and intelligence of water quality multi-parameter monitoring instruments, a micro-in-situ water quality multi-parameter detector based on the fusion of sequential injection analysis (SIA) and continuous spectral detection methods has been developed. The core of the system design lies in the structure design of the digestion cell and the digestion cell as the detection cell, and the principle design of the microinjection technology sequential injection platform and the design of the multi-parameter combined digestion measurement process. A multi-parameter sequential injection analysis and detection process based on the national standard for water quality testing was designed. Fusion sequential injection analysis technology was used to detect the content of nitrite nitrogen, nitrate nitrogen, total nitrogen and total phosphorus under the conditions of continuous spectrum scanning measurement. Before digestion, the nitrate nitrogen and nitrite nitrogen were measured by direct spectrum. After digestion, the total nitrogen is detected by spectrum, and after color reaction, the total phosphorus is detected by spectrum. In this system, the in-situ water quality parameters of nitrite nitrogen, nitrate nitrogen, total phosphorus and total nitrogen are used as measurement objects. Based on the continuous spectrum analysis and the least square method, the regression model is established and the concentration absorbance standard working curve of each parameter is drawn, and its goodness of fit (determining coefficient) is ≥0.989 9. Prepare the mixture solution with a known content of nitrite nitrogen, nitrate nitrogen, total nitrogen and total phosphorus. According to the above multi parameter detection process, use the standard working curve drawn by the system to measure four parameters. The experimental results show that the repeatability of experimental parameters (RSD≤3.86%), the system can stably and efficiently analyze the content of nitrite nitrogen, nitrate nitrogen, total nitrogen, and total phosphorus in different water samples. Based on the SIA continuous spectrum fusion method to study the in-situ water quality multi-parameter detection method, it plays an important role in improving the technical performance of on-line water quality monitoring instrument. Technical performance has an important role. The development of a miniature multi-parameter water quality monitor has a good prospect for parameter expansion and is suitable for a variety of water quality online monitoring platforms.
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