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A potential tool for high-resolution monitoring of ocean acidification.

Artikel i vetenskaplig tidskrift
Författare Aron Hakonen
Leif G Anderson
Johan Engelbrektsson
Stefan Hulth
Bengt Karlson
Publicerad i Analytica Chimica Acta
Volym 786
Sidor 1-7
ISSN 0003-2670
Publiceringsår 2013
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 1-7
Språk en
Länkar dx.doi.org/10.1016/j.aca.2013.04.04...
Ämnesord Ocean acidification, pH monitoring, Fluorescence, Non-linear calibrations, 6,8-Dihydroxypyrene-1,3-disulfonic acid, High-flow/low-flow sampling
Ämneskategorier Analytisk kemi, Spektroskopi, Klimatforskning, Annan geovetenskap och miljövetenskap

Sammanfattning

Current anthropogenic carbon dioxide emissions generate besides global warming unprecedented acid-ification rates of the oceans. Recent evidence indicates the possibility that ocean acidification and lowoceanic pH may be a major reason for several mass extinctions in the past. However, a major bottleneck forresearch on ocean acidification is long-term monitoring and the collection of consistent high-resolutionpH measurements. This study presents a low-power (<1 W) small sample volume (25l) semiconductor based fluorescence method for real-time ship-board pH measurements at high temporal and spatialresolution (approximately 15 s and 100 m between samples). A 405 nm light emitting diode and the blueand green channels from a digital camera was used for swift detection of fluorescence from the pH sen-sitive dye 6,8-Dihydroxypyrene-1,3-disulfonic acid in real-time. Main principles were demonstrated byautomated continuous measurements of pH in the surface water across the Baltic Sea and the Kattegatregion with a large range in salinity (∼3–30) and temperature (∼0–25◦C). Ship-board precision of salinityand temperature adjusted pH measurements were estimated as low as 0.0001 pH units.

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