海水中极低浓度营养盐在线测量仪

Design of an autonomous instrument for low-level nutrient measurement in seawater

设计了海水中极低浓度营养盐在线测量仪,测量方法采用吸收光度法。采用长光程液芯波导作为样品池,光信号由光纤收集、光谱仪分光。线阵CCD探测器测量样品吸光度,可以实现多种营养要素的快速检测。检测极限达到了0.2 nmol/dm3;分液泵、注射泵、电磁阀及过滤网等构成了现场自动进样系统;电子学系统由PC104工控机、CCD数据采集卡及自动进样控制电路组成,实现了水样的提取及在线过滤、样品与试剂的精密配比和混合反应以及光谱测量及分析的自动化。该仪器不仅可用来作为剖面测量,而且也可用于定点长时间序列测量。

Based on spectrophotometric principle,a high-sensitivity instrument on line measurement for measuring very low-level seawater nutrient concentration is designed.In this instrument,the optical cell is made of a flexible long optical pathlength liquid-core waveguide（LWCC）,and the light is collected and transferred into the entrance slit of a spectrometer,and then spectral absorbance signal is measured by a line CCD device.This instrument can be used to measure multi-element quickly,with a theoretical detectio...