In-Situ Instrument for Rapid Detection of Nitrates and Nitrites in Water
LI Cai1, GUI Jing-chuan1, 2, SUN Ling-yan1, 2, CAO Wen-xi1, SUN Zhao-hua1, YANG Yue-zhong1
1. State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：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.
Key words：In-situ measurement;Incomplete chemical color reaction;Cadmium-copper column reduction;Colorimetric analysis;Sequential injection analysis
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 . 海水硝酸盐/亚硝酸盐原位快速测量仪 [J]. 光谱学与光谱分析, 2013, 33(06): 1714-1718.
LI Cai1, GUI Jing-chuan1, 2, SUN Ling-yan1, 2, CAO Wen-xi1, SUN Zhao-hua1, YANG Yue-zhong1 . In-Situ Instrument for Rapid Detection of Nitrates and Nitrites in Water . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(06): 1714-1718.
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