Apparent nitrous acid dissociation across environmentally relevant temperatures in freshwater and seawater

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-10-23 DOI:10.1002/lno.12714
Benedict Borer, Eric Bi, Ryan J. Woosley, Andrew R. Babbin
{"title":"Apparent nitrous acid dissociation across environmentally relevant temperatures in freshwater and seawater","authors":"Benedict Borer, Eric Bi, Ryan J. Woosley, Andrew R. Babbin","doi":"10.1002/lno.12714","DOIUrl":null,"url":null,"abstract":"Nitrite is a ubiquitous compound found across aquatic systems and an intermediate in both the oxidative and reductive metabolisms transforming fixed nitrogen in the environment. Yet, the abiotic cycling of nitrite is often overlooked in favor of biologically mediated reactions. Here we quantify the apparent acid dissociation constant (p<jats:italic>K</jats:italic><jats:sub>a</jats:sub>) between nitrous acid and its conjugate base nitrite in both freshwater and seawater systems across a range of environmentally relevant temperatures (5–35°C) using potentiometric‐based titration. In freshwater, we measured a p<jats:italic>K</jats:italic><jats:sub>a,NBS</jats:sub> of 3.14 at 25°C and a p<jats:italic>K</jats:italic><jats:sub>a,<jats:italic>T</jats:italic></jats:sub> of 2.87 for seawater at the same temperature. We quantify substantial effects of both salinity and temperature on the p<jats:italic>K</jats:italic><jats:sub>a</jats:sub>, with colder and fresher water manifesting higher values and thus a greater proportion of protonated nitrite at any given pH. Because nitrous acid is unstable and decomposes to nitric oxide, the implications for the nitrous acid dissociation constant on ecosystem function are broad.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Limnology and Oceanography","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1002/lno.12714","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"LIMNOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

Nitrite is a ubiquitous compound found across aquatic systems and an intermediate in both the oxidative and reductive metabolisms transforming fixed nitrogen in the environment. Yet, the abiotic cycling of nitrite is often overlooked in favor of biologically mediated reactions. Here we quantify the apparent acid dissociation constant (pKa) between nitrous acid and its conjugate base nitrite in both freshwater and seawater systems across a range of environmentally relevant temperatures (5–35°C) using potentiometric‐based titration. In freshwater, we measured a pKa,NBS of 3.14 at 25°C and a pKa,T of 2.87 for seawater at the same temperature. We quantify substantial effects of both salinity and temperature on the pKa, with colder and fresher water manifesting higher values and thus a greater proportion of protonated nitrite at any given pH. Because nitrous acid is unstable and decomposes to nitric oxide, the implications for the nitrous acid dissociation constant on ecosystem function are broad.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
淡水和海水在环境相关温度下的表观亚硝酸解离度
亚硝酸盐是水生系统中普遍存在的一种化合物,也是环境中固定氮转化的氧化和还原代谢的中间产物。然而,亚硝酸盐的非生物循环往往被忽视,而生物介导的反应则被忽视。在此,我们利用电位滴定法,在淡水和海水系统中,在环境相关温度范围(5-35°C)内,量化了亚硝酸与其共轭碱亚硝酸盐之间的表观酸解离常数(pKa)。在淡水中,我们测得 25°C 时的 pKa,NBS 为 3.14,而在相同温度的海水中,pKa,T 为 2.87。我们量化了盐度和温度对 pKa 的重大影响,在任何给定的 pH 值下,较冷和较新鲜的水的 pKa 值较高,因此质子化亚硝酸盐的比例也较大。由于亚硝酸不稳定并会分解成一氧化氮,因此亚硝酸解离常数对生态系统功能的影响是广泛的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
期刊最新文献
Can intense storms affect sinking particle dynamics after the North Atlantic spring bloom? Moderate and extreme warming under a varied resource supply alter the microzooplankton–phytoplankton coupling in North Sea coastal communities Dual phosphorus and nitrogen nutrient reduction will be more effective than a phosphorus‐only reduction in mitigating diatom and cyanobacterial blooms in Lake Erie, USA–Canada Relative size matters: Spawning substrate roughness size and spacing affect egg dislodgement and retention in the benthos Different elemental stoichiometries of Fe‐limited Trichodesmium when grown under inorganic and organic phosphorus sources
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1