海水硝酸盐／亚硝酸盐原位快速测量仪  

In-Situ Instrument for Rapid Detection of Nitrates and Nitrites in Water

作　　者：李彩[1] 桂景川[1,2] 孙羚晏[1,2] 曹文熙[1] 孙兆华[1] 杨跃忠[1] 

机构地区：[1]中国科学院南海海洋研究所,热带海洋环境国家重点实验室,广东广州510301 [2]中国科学院大学,北京100049

出　　处：《光谱学与光谱分析》2013年第6期1714-1718,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金联合基金项目(U0933005);中国科学院科研装备项目(2010042);广州市科技新星计划项目(2012J2200057);中国科学院南海海洋研究所青年人才领域前沿项目(SQ200811)资助

摘　　要：基于SIA顺序注射法以及分光光度原理研制了海水硝酸盐/亚硝酸盐原位快速测量仪。对最佳不完全显色反应时间以及硝酸盐镉铜柱还原速度进行了实验优化筛选,采用液芯波导替代比色皿作为样品池,在实现原位快速测量(测量时间可短至4min)的同时也大大减少了样品量,缩小了仪器体积、重量,降低了仪器功耗,提高其灵敏度(nmol·L-1),使其更适于原位测量。仪器具有良好的通用性和可扩展性,稍作调整,即可用于不同海域各种营养要素的剖面及定点测量。A new in-situ instrument to simultaneously and rapidly detect the nitrates and nitrites of water is presented based on the sequential injection analysis （SIA） and spectrophotometer. The optimal time and injection speed for incomplete chemical color reaction of nitrite with reagent and deoxidization efficiency of cadmium column on changing nitrate to nitrite were studied and selected to obtain the rapid detection speed （the detection time for a sample can be as short as 5 mins for nitrates and 4 min for nitrites） of nitrates and nitrites in situ. In this instrument, the liquid-core waveguide （LCW） was adopted to replace the quartz cuvette as the colorimetric cell to obtain a relatively low detection limit（nmol· L^-1 ） and very small sample consumption, and all water sample was filtered before sample injection and measurement. These measures make this in-situ detection instrument have the advantages of complete automation, very quick detection speed, low weight and power consumption, and good versatility and extensibility. Only by replacing the reagent or LCW, it also can be used to measure the trace element of water or other nutrition elements such as phosphate, silicate etc, in different sea areas in profile or fixed-point.

关 键 词：原位测量 不完全显色反应 镉铜柱还原 比色分析 顺序注射 

分 类 号：O657.3[理学—分析化学]