Charly A. Moras, Lennart T. Bach, Tyler Cyronak, Renaud Joannes-Boyau, Kai G. Schulz
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引用次数: 1
摘要
海水碳酸盐化学的精确测量对海洋碳循环研究至关重要。经认证的标准物质(crm)通常与样品一起分析,以纠正校准漂移的测量。然而,COVID-19大流行导致对crm的获取有限。为了应对这一短缺,我们分别在12个月和15个月的时间里制备和监测了总碱度(TA)和溶解无机碳(DIC)的内部参考物质(IHRMs)。总的来说,TA是稳定的,但DIC在15个月内出现了约2 μmol kg−1的轻微增加。这种增加可能归因于细菌生长,尽管氯化汞固定和反复暴露在紫外线下。值得注意的是,这个小的增加很可能是在我们的仪器和测量不确定度之内。我们的重复测量还发现,一些瓶子的TA或DIC浓度比其他瓶子高4-5 μmol kg - 1,这表明在清洗、固定或储存单个瓶子时存在问题。这项研究强调了如果使用自备的ihrm,仔细和持续监测的重要性。考虑到所需的工作量非常大,只有在没有crm的情况下才建议进行IHRM准备。
Preparation and quality control of in-house reference materials for marine dissolved inorganic carbon and total alkalinity measurements
Accurate measurements of seawater carbonate chemistry are crucial for marine carbon cycle research. Certified reference materials (CRMs) are typically analyzed alongside samples to correct measurements for calibration drift. However, the COVID-19 pandemic led to a limited access to CRMs. In response to this shortage, we prepared and monitored in-house reference materials (IHRMs) for total alkalinity (TA) and dissolved inorganic carbon (DIC), over 12 and 15 months, respectively. Overall, TA was stable, but a slight increase in DIC of about 2 μmol kg−1 occurred over 15 months. The increase could potentially be attributed to bacterial growth, despite mercuric chloride fixation and repeated UV exposure. It is noted that this small increase was most likely within our instrument and measurements uncertainties. Our repeated measurements also identified a few bottles that had TA or DIC concentrations 4–5 μmol kg−1 higher than the rest, indicating issues during cleaning, fixation, or storage of individual bottles. This study emphasizes the importance of careful and continuous monitoring if self-prepared IHRMs are used. Given that the amount of work required is very high, IHRM preparation is only recommended when CRMs are not available.
期刊介绍:
Limnology and Oceanography: Methods (ISSN 1541-5856) is a companion to ASLO''s top-rated journal Limnology and Oceanography, and articles are held to the same high standards. In order to provide the most rapid publication consistent with high standards, Limnology and Oceanography: Methods appears in electronic format only, and the entire submission and review system is online. Articles are posted as soon as they are accepted and formatted for publication.
Limnology and Oceanography: Methods will consider manuscripts whose primary focus is methodological, and that deal with problems in the aquatic sciences. Manuscripts may present new measurement equipment, techniques for analyzing observations or samples, methods for understanding and interpreting information, analyses of metadata to examine the effectiveness of approaches, invited and contributed reviews and syntheses, and techniques for communicating and teaching in the aquatic sciences.