Miniature flow injection analyser for laboratory, shipboard and in situ monitoring of nitrate in estuarine and coastal waters
Miniature flow injection analyser for laboratory, shipboard and in situ monitoring of nitrate in estuarine and coastal waters
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DOI：
10.1016/s0039-9140(02)00425-3
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发表时间：
2002-12-06
期刊：
影响因子：
6.1
通讯作者：
Worsfold, PJ
中科院分区：
文献类型：
--
作者：
Gardolinski, PCFC;David, ARJ;Worsfold, PJ
本文介绍了一种微型流动注射固体分光光度法现场测定硝酸盐的分析仪。它利用标准的实验室化学镉还原，然后重氮化。检测限为2.8 μ l（-1）N，线性范围可从2.8 - 100 μ l（-1）N变化到100 - 2000 μ l（-1）N，以适应当地环境条件。实验室、船上（北海IMPACT巡航）和现场（英国添马舰河口）部署的结果证明了该仪器的多功能性。它们显示了优异的时间和空间分辨率，可以实现在河口和沿海沃茨的动态过程的研究。在IMPACT巡航期间获得的结果绘制了硝酸盐从亨伯河口到北海的运输图，并显示硝酸盐的吸收在浅水和清澈的沃茨（多格滩）比在悬浮固体含量较高的沿海混合区更明显。该分析仪的一个关键特点是其便携性和易于部署，由于体积小，重量轻，浮力低。通过参加国际比对活动评估准确度，结果在指定的一致平均值容许区间内（Z <2）。(C)2002 Elsevier Science B.V.保留所有权利。
A miniature, submersible flow injection analyser, with solid-state spectrophotometric detection, for the in situ determination of nitrate is described. It utilises the standard laboratory chemistry of cadmium reduction followed by diazotisation. The detection limit was 2.8 mug l(-1) N and the linear range could be varied from 2.8 to 100 mug l(-1) N up to 100-2000 mug l(-1) N to suit local environmental conditions. The versatility of the instrument is demonstrated by results from laboratory, shipboard (North Sea IMPACT Cruise) and in situ (Tamar Estuary, UK) deployments. They show the excellent temporal and spatial resolution that can be achieved for studying dynamic processes in estuarine and coastal waters. The results acquired during the IMPACT Cruise map the transport of nitrate from the Humber Estuary into the North Sea and show that nitrate uptake was more pronounced in areas of shallow and clear waters (Dogger Bank) than in the coastal mixing zone with higher suspended solids. A key feature of the analyser is its portability and ease of deployment due to the small size and weight and low buoyancy. Accuracy was assessed by participation in an international intercomparison exercise and the results were within the assigned tolerance interval of the consensus mean (Z < 2). (C) 2002 Elsevier Science B.V. All rights reserved.