激光与光电子学进展, 2019, 56 (18): 180102, 网络出版: 2019-09-09
基于分光光度法的便携式亚硝氮测定仪
Portable Nitrite Analyzer Based on Spectrophotometry
摘要
针对走航式海洋环境监测的需要,研究一种基于分光光度法的便携式海水亚硝氮测定仪。该亚硝氮测定仪采用发光二极管(LED)和光电二极管分别作为仪器光源和检测器,利用控制芯片构建信号调理电路模块。该模块对LED光源提供恒流驱动,并对光电二极管检测到的光强信号进行转换、处理、解算。实验结果表明该亚硝氮测定仪具有低检出限(检出限为0.014 μmol·L
-1)、高精度、优异的线性特性(线性相关系数大于0.9996)和良好的重复性(在3天内测定的相对标准偏差β RSD为0.25%~1.3%)。
Abstract
A portable seawater nitrite analyzer based on spectrophotometry was developed for the needs of navigational monitoring in marine environments. The nitrite analyzer used a light-emitting-diode (LED) as the light source, a photodiode as the detector, and a conditioning circuit module as the control chip. It provided constant current to drive the LED, and processed the transition, dispose, and calculation of the light intensity signal detected by the photodiode. The experimental results show that the nitrite analyzer has a low detection limit (0.014 μmol·L
-1), high precision, excellent linearity (linear correlation coefficients are more than 0.9996), and good repetition. The relative standard deviations βRSD measured within three days are 0.25%-1.3%.
董辰杨, 李文湛, 王志宏, 梁晋涛. 基于分光光度法的便携式亚硝氮测定仪[J]. 激光与光电子学进展, 2019, 56(18): 180102. 董辰杨, 李文湛, 王志宏, 梁晋涛. Portable Nitrite Analyzer Based on Spectrophotometry[J]. Laser & Optoelectronics Progress, 2019, 56(18): 180102.