不同海水营养盐现场连续观测系统的比较研究*

doi:10.11978/2020087

Abstract

Abstract:

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.

Key words: nutrient, automatic in-situ observation, marine environmental monitoring, application research

CLC Number:

P716⁺.5

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.

Figures/Tables 6

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	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、PO₄^3-、NO₂^-	NO₃^-、Si(OH)₄、PO₄^3-、NO₂^-
测量范围/(μmol·L^-1)	0.5~2000	NO₃^-、Si(OH)₄: 0.05~50 PO₄^3-、NO₂^-: 0.02~11	NO₂^-: 0.1~80; Si(OH)₄: 0.16~160; PO₄^3-: 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

Comparison of different continuous in-situ observation systems in seawater

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