The Spatiotemporal Variability of pH in Waters of the Black Sea

Polonsky, A. B.; Grebneva, E.A.

doi:10.1134/s1028334x19060072

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…This may include not only Mn(III)–DFOB, but a variety of other Mn(III)–L complexes that could exist in the environment. As an example, at the mean pH of Black Sea surface waters (8.38) [ 35 ], Mn(III)–DFOB would be stable for weeks. Since complexation to DFOB and other siderophores is thought to increase Mn bioavailability [ 36 ], such complexes are likely important players in Mn biogeochemistry.…”

Section: Resultsmentioning

confidence: 99%

Challenges of Measuring Soluble Mn(III) Species in Natural Samples

et al. 2022

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Soluble Mn(III)–L complexes appear to constitute a substantial portion of manganese (Mn) in many environments and serve as critical high-potential species for biogeochemical processes. However, the inherent reactivity and lability of these complexes—the same chemical characteristics that make them uniquely important in biogeochemistry—also make them incredibly difficult to measure. Here we present experimental results demonstrating the limits of common analytical methods used to quantify these complexes. The leucoberbelin-blue method is extremely useful for detecting many high-valent Mn species, but it is incompatible with the subset of Mn(III) complexes that rapidly decompose under low-pH conditions—a methodological requirement for the assay. The Cd-porphyrin method works well for measuring Mn(II) species, but it does not work for measuring Mn(III) species, because additional chemistry occurs that is inconsistent with the proposed reaction mechanism. In both cases, the behavior of Mn(III) species in these methods ultimately stems from inter- and intramolecular redox chemistry that curtails the use of these approaches as a reflection of ligand-binding strength. With growing appreciation for the importance of high-valent Mn species and their cycling in the environment, these results underscore the need for additional method development to enable quantifying such species rapidly and accurately in nature.

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Section: Resultsmentioning

confidence: 99%

Challenges of Measuring Soluble Mn(III) Species in Natural Samples

et al. 2022

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“…The ocean covers a wide area, due to the differences in geographical and climatic conditions, the ocean conditions in different regions are different. Taking seawater ph as an example, even in the same area, the seawater ph is not static with the change of time and space conditions [1,2] . In most long-term tests of seawater corrosion, seawater is considered a nearneutral environment [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Study on corrosion kinetics of 304 stainless steel by 3.5% NaCl solution

Zhang,

Yuan,

2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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The corrosion process of 304 stainless steel was considered to be mainly composed of the diffusion of corrosion solution to the reaction interface through the corrosion layer and the corrosion reaction between corrosion solution and stainless steel at the reaction interface, and and based on this, the dynamic equation of stainless steel corrosion process was established. The corrosion process of 304 stainless steel in 3.5% NaCl solution at 303.15K, 313.15K and 323.15K was analyzed by electrochemical method, and the diffusion coefficient and reaction constant at different temperatures were calculated according to the corrosion experimental results and the established kinetic model. The results showed that the diffusion of corrosion solution through the corrosion layer was the limiting link in the whole stainless steel corrosion process, and the activation energy of chemical reaction between corrosion solution and stainless steel was 28.42KJ/mol .

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“…Отдельные морские системы будут затронуты больше, чем другие, в зависимости от их океанографических характеристик. В шельфовых морях последствия закисления океана могут усугубляться сезонным увеличением речного стока, деградацией органического вещества, усилением апвеллингов [3][4][5]. Специалисты предполагают, что в дальнейшем падение pH должно распространиться и на глубинные слои океана.…”

Section: Introductionunclassified

“…Средний глобальный показатель рН открытых районов океанов уменьшился на 0,017-0,027 за последние 15-30 лет [1,3]. Ситуация в Черном море выглядит еще более негативно: только за последнее десятилетие зафиксировано значительное (более чем на 0,2) уменьшение величины pH в поверхностном слое, вызванное, главным образом, предшествующим усилением циклонических круговоротов, формируемых Основным черноморским течением, и усилением подъема глубинных вод с пониженными значениями pH [3][4][5]. При сравнении изменения pH на поверхности и на горизонте 10 м отмечается, что уменьшение pH на поверхности существенно больше, чем в подповерхностном слое.…”

Section: Introductionunclassified

Energy Metabolism of Mytilus Galloprovincialis Under Low Seawater Ph

Vyalova

2023

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The problem of acidification of the World Ocean and predicting the consequences for its inhabitants is becoming more and more relevant every year. The effect of short-term pH fluctuations in coastal ecosystems on the physiology of calcifying organisms—bivalves—remains poorly understood. The energy metabolism of the Black Sea mussel Mytilus galloprovincialis was investigated for the marine environment in a wide pH range, from 8.2 to 6.65. Lowering the pH to 7.0–7.5 led to a 20–25 % reduction in oxygen consumption by molluscs. At lower pH (6.54–6.7), aerobic respiration sharply decreased by 85– 90 %, down to the minimum values (2.12–2.62 µgO2/g dry/h), and the organisms transitioned to anaerobic metabolism. The metabolic response of the mussels subjected to short-term pH changes (8.2→6.65→7.2) has been investigated. The oxygen consumption of molluscs exposed at the same pH of 7.2 depended on the direction of the change in pH. Thus, in the case of pH 6.65→7.2, the respiration intensity was 30 % higher compared to the values obtained under the acidification pH 8.2→7.2. The Black Sea mussel M. galloprovincialis is shown to have the capacity for survival in the marine environment characterized by the rapid fluctuations in pH that occur during the upwelling events in the coastal areas of the Black Sea.

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The Spatiotemporal Variability of pH in Waters of the Black Sea

Cited by 6 publications

References 5 publications

Challenges of Measuring Soluble Mn(III) Species in Natural Samples

Challenges of Measuring Soluble Mn(III) Species in Natural Samples

Study on corrosion kinetics of 304 stainless steel by 3.5% NaCl solution

Energy Metabolism of Mytilus Galloprovincialis Under Low Seawater Ph

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