Journal of Tropical Oceanography >
Comparison of different continuous in-situ observation systems in seawater
Copy editor: LIN Qiang
Received date: 2020-08-04
Request revised date: 2020-09-13
Online published: 2020-09-20
Supported by
National Natural Science Foundation of China(41876080)
Copyright
As an important part of automatic marine observation, autonomous instrument of nutrients in seawater is a focus of marine observation in the world. In this paper, we summarize research progresses of autonomous instruments for marine nutrient monitoring, according to different continuous in-situ observation systems for nutrients, and evaluate these systems. Nitrate sensors based on UV/Vis spectroscopy are widely used in underway-pumping, vertically profiling and buoy observations with the advantage of chemical reagent free, quicker response and longer duration; but these sensors have fewer parameters monitored and are lower in sensitivity. The Autonomous Profiling Nutrient Analyzer (APNA) nutrient profiling analyzers and QuAAtro continuous flow analyzer are based on “wet chemistry”, and are widely used in shallow water profiling and short time series observations, with the advantages of higher analytical precision and accuracy, and multi-nutrient parameters. However, their disadvantages include complicated operation, larger reagent consumption, and short duration; they are not suitable for long-term and deep-water observations. APNA can be used for in-situ observation. QuAAtro is shipboard based and requires additional sampling and filtration system. Technical bottlenecks and future development direction of autonomous instruments for nutrients are then discussed, which will provide a guidance for the selection of automatic observation instruments in marine environmental observation.
WANG Lifang , HUANG Tao , DU Chuanjun , GUO Xianghui . Comparison of different continuous in-situ observation systems in seawater[J]. Journal of Tropical Oceanography, 2021 , 40(3) : 103 -113 . DOI: 10.11978/2020087
图1 珠江口NO2-+NO3-的平面分布图a. ISUS与AA3测定比较; b. AA3测量数据(每个点代表一个站位), 单位: μmol·L-1; c. 校正后的ISUS走航观测数据 Fig. 1 Distribution of NO2-+NO3- in the Pearl River Estuary a. comparison with measurements of AA3 and ISUS; b. result of AA3 observation (each dot represents one station), units: μmol·L-1; c. result of corrected ISUS observation |
表1 不同营养盐在线观测方法的比对Tab. 1 Comparison of in-situ observation methods of nutrients |
ISUS硝酸盐传器 | APNA营养盐剖面分析仪 | QuAAtro流动分析仪 | |
---|---|---|---|
原理 | 紫外光谱法 | 湿化学法(CFA+光度法) | 湿化学法(SFA+光度法) |
试剂需求 | 无 | 需要 | 需要 |
测量参数 | NO3- | NO3-、Si(OH)4、PO43-、NO2- | NO3-、Si(OH)4、PO43-、NO2- |
测量范围/(μmol·L-1) | 0.5~2000 | NO3-、Si(OH)4: 0.05~50 PO43-、NO2-: 0.02~11 | NO2-: 0.1~80; Si(OH)4: 0.16~160; PO43-: 0.08~30; NO2-: 0.04~40 |
测量精度 | ±2μmol·L-1 或读数的±10% | 2%~5% | 2% |
耐压深度/m | 0~1000 | 0~200 | - |
数据采集频率/Hz | 1 | 1 | >60 |
最大持续时间 | >1个月 | <1个月 | <1个月 |
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