Freezing-induced acidification of sea ice brine

J 2024

Freezing-induced acidification of sea ice brine

VESELÝ, Lukáš; Radim ŠTŮSEK; Ondrej MIKULA; Xin YANG; Dominik HEGER et al.

Základní údaje

Originální název

Freezing-induced acidification of sea ice brine

Autoři

VESELÝ, Lukáš; Radim ŠTŮSEK; Ondrej MIKULA; Xin YANG a Dominik HEGER

Vydání

Science of the Total Environment, AMSTERDAM, ELSEVIER, 2024, 0048-9697

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10403 Physical chemistry

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 8.000

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/24:00137406

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Fractional crystallization; Buffering capacity; Acidification; Sea ice; Brine

Štítky

14313010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 24. 10. 2024 11:47, Mgr. Pavla Foltynová, Ph.D.

Anotace

V originále

The acidity of sea ice and snow plays a key role in the chemistry of the cryosphere; an important example lies in the photochemical catalytic release of reactive bromine in polar regions, facilitated at pHs below 6.5. We apply in-situ acid-base indicators to probe the microscopic acidity of the brine within the ice matrix in artificial sea water at a range of concentrations (0.35-70 PPT) and initial pHs (6-9). The results are supported by analogous measurements of the most abundant salts in seawater: NaCl, Na2SO4, and CaCO3. In the research herein, the acidity is expressed in terms of the Hammett acidity function, H2- . The obtained results show a pronounced acidity increase in sea water after freezing at -15 degrees C and during the subsequent cooling down to -50 degrees C. Importantly, we did not observe any significant hysteresis; the values of acidity upon warming markedly resembled those at the corresponding temperatures at cooling. The acidity increase is attributed to the minerals' crystallization, which is accompanied by a loss of the buffering capacity. Our observations show that lower salinity sea water samples (<= 3.5 PPT) reach pH values below 6.5 at the temperature of -15 degrees C, whereas higher salinity ices attain such values only at -30 degrees C. The ensuing implications for polar chemistry and the relevance to the field measurements are discussed.

Návaznosti

MUNI/C/0104/2023, interní kód MU

Název: Studie změn kyselosti po zamrazení vybraných vícesytných anorganických solí a kyselin

Investor: Masarykova univerzita, Studie změn kyselosti po zamrazení vybraných vícesytných anorganických solí a kyselin, Podpora vynikajících diplomových prací

Citovat

VESELÝ, Lukáš; Radim ŠTŮSEK; Ondrej MIKULA; Xin YANG a Dominik HEGER. Freezing-induced acidification of sea ice brine. Science of the Total Environment. AMSTERDAM: ELSEVIER, 2024, roč. 946, OCT, s. 174194-174207. ISSN 0048-9697. Dostupné z: https://doi.org/10.1016/j.scitotenv.2024.174194.

@article{2445938,
   author = {Veselý, Lukáš and Štůsek, Radim and Mikula, Ondrej and Yang, Xin and Heger, Dominik},
   article_location = {AMSTERDAM},
   article_number = {OCT},
   doi = {https://doi.org/10.1016/j.scitotenv.2024.174194},
   keywords = {Fractional crystallization; Buffering capacity; Acidification; Sea ice; Brine},
   language = {eng},
   issn = {0048-9697},
   journal = {Science of the Total Environment},
   title = {Freezing-induced acidification of sea ice brine},
   url = {https://www.sciencedirect.com/science/article/abs/pii/S0048969724043420?via%3Dihub},
   volume = {946},
   year = {2024}
}

TY  - JOUR
ID  - 2445938
AU  - Veselý, Lukáš - Štůsek, Radim - Mikula, Ondrej - Yang, Xin - Heger, Dominik
PY  - 2024
TI  - Freezing-induced acidification of sea ice brine
JF  - Science of the Total Environment
VL  - 946
IS  - OCT
SP  - 174194
EP  - 174194
PB  - ELSEVIER
SN  - 00489697
KW  - Fractional crystallization
KW  - Buffering capacity
KW  - Acidification
KW  - Sea ice
KW  - Brine
UR  - https://www.sciencedirect.com/science/article/abs/pii/S0048969724043420?via%3Dihub
N2  - The acidity of sea ice and snow plays a key role in the chemistry of the cryosphere; an important example lies in the photochemical catalytic release of reactive bromine in polar regions, facilitated at pHs below 6.5. We apply in-situ acid-base indicators to probe the microscopic acidity of the brine within the ice matrix in artificial sea water at a range of concentrations (0.35-70 PPT) and initial pHs (6-9). The results are supported by analogous measurements of the most abundant salts in seawater: NaCl, Na2SO4, and CaCO3. In the research herein, the acidity is expressed in terms of the Hammett acidity function, H2- . The obtained results show a pronounced acidity increase in sea water after freezing at -15 degrees C and during the subsequent cooling down to -50 degrees C. Importantly, we did not observe any significant hysteresis; the values of acidity upon warming markedly resembled those at the corresponding temperatures at cooling. The acidity increase is attributed to the minerals' crystallization, which is accompanied by a loss of the buffering capacity. Our observations show that lower salinity sea water samples (<= 3.5 PPT) reach pH values below 6.5 at the temperature of -15 degrees C, whereas higher salinity ices attain such values only at -30 degrees C. The ensuing implications for polar chemistry and the relevance to the field measurements are discussed.
ER  -

VESELÝ, Lukáš; Radim ŠTŮSEK; Ondrej MIKULA; Xin YANG a Dominik HEGER. Freezing-induced acidification of sea ice brine. \textit{Science of the Total Environment}. AMSTERDAM: ELSEVIER, 2024, roč.~946, OCT, s.~174194-174207. ISSN~0048-9697. Dostupné z: https://doi.org/10.1016/j.scitotenv.2024.174194.

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