2024-03-28T14:36:11Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1820342019-05-22T11:22:59Zcom_10261_88com_10261_8col_10261_341
DIGITAL.CSIC
author
Thouron, Danièle
author
Vuillemin, Renaud
author
Philippon, Xavier
author
Lourenço, Antonio
author
Provost, Christine
author
Cruzado, Antonio
author
Garçon, Véronique
2019-05-22T11:21:55Z
2019-05-22T11:21:55Z
2003
Analytical chemistry 75 (11) : 2601-2609 (2003)
0003-2700
http://hdl.handle.net/10261/182034
1520-6882
An autonomous nutrient analyzer in situ (ANAIS) has been developed to monitor nitrate, silicate, and phosphate concentrations while deployed at sea at pressure (down to 1000 m). Detection is made by spectrophotometry. The instrument uses solenoid-driven diaphragm pumps to propel the sample, the standards, and the reagents through a microconduit, flow injection-style thermostated manifold. The analyzers are placed in an equipressure container filled with oil. The analyzers operate until a pressure of 100 bar and show a linear response up to 40 μM nitrate,150 μM silicate, and 5 μM phosphate with a detection limit less than 0.1, 0.5, and 0.1 μM and an accuracy of 1, 1, and 3% for nitrate, silicate, and phosphate, respectively. The measurement protocol includes three steps over 13 min: rinsing with the sample stream, reagents introduction, and absorbance detection. Field tests comprise ANAIS nitrate, silicate, and phosphate testing alone in the surface ocean. Phosphate results are not yet fully satisfactory. The instrument implemented on top of a YOYO vertical eulerian profiler was then deployed successfully in the northwestern Mediterranean Sea acquiring 30 nitrate profiles between 200 and 1100 m over a 15-day period. This chemical analyzer can be a valuable observing asset adapted on any type of oceanographic platform.
eng
closedAccess
An autonomous nutrient analyzer for oceanic long-term in situ biogeochemical monitoring
artículo
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