通过玻璃磁铁搅拌加速反应缩短用温克勒法测定海水中溶解氧的时间

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY Journal of Sea Research Pub Date : 2024-06-14 DOI:10.1016/j.seares.2024.102513
Yuhan Zhang , Haoming Xu , Guodong Song , Guiling Zhang , Sumei Liu
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引用次数: 0

摘要

溶解氧(DO)是各学科海洋研究的核心参数之一。温克勒法作为一种经典方法,被广泛用于溶解氧的测定。该方法利用 Mn2+ 与 I3--的反应,将溶解氧定量转化为碘,然后用硫代硫酸钠溶液滴定。然而,由于在加入酸洗试剂后需要摇动和/或重新摇动溶解氧瓶并等待沉淀物沉淀,这种方法费时费力。在本研究中,我们使用玻璃涂层磁力搅拌棒以 1000 rpm 的转速搅拌 1 分钟,以取代传统的静态沉淀法。通过手动滴定获得的溶解氧测量精度(变异系数 CV <0.2%)与传统方法相当。相反,涂有聚四氟乙烯(PTFE)的磁力搅拌棒因释放出预吸附的氧气而不适用。在印度洋巡航期间进行的对比实验表明,使用改进方法获得的溶解氧测量结果与使用传统方法获得的结果非常一致。两种方法线性回归的判定系数(R2)为 0.999,结果之比平均为 1.00 ± 0.02。我们的研究还发现,在加入酸洗试剂后,Mg2+、Ca2+、OH- 和 HCO3- 的共同作用会延长沉淀时间。总之,这种改良方法在测定一个经典的海洋学参数方面是一个有用且省力的进步,有可能被科学家和技术人员广泛采用。
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Acceleration of reaction by glass magnet stirring shortens the time for the determination of dissolved oxygen in seawater by the Winkler method

Dissolved oxygen (DO) is one of the core parameters in ocean investigation among various disciplines. The Winkler method, a classical approach, is extensively employed for DO determination. This method uses the reaction of Mn2+ to I3‐− as a proxy to quantitatively convert DO to iodine, followed by titration with sodium thiosulfate solution. However, this method is time-consuming and laborious due to the shaking and/or re-shaking of the DO bottle after adding the pickling reagents and waiting for the precipitate to settle. In this study, we implemented a stirring operation using a glass-coated magnetic stir bar at 1000 rpm for 1 min to replace the traditional static settling. The precision of DO measurements obtained via manual titration (coefficient of variation, CV < 0.2%) was comparable to that of the traditional method. Conversely, a polytetrafluoroethylene (PTFE) coated magnetic stir bar was unsuitable due to the release of pre-adsorbed oxygen. Comparative experiments conducted during an Indian Ocean cruise demonstrated that the DO measurements obtained using the improved method were in good agreement with those obtained using the traditional method. The coefficient of determination (R2) from the linear regression of the two methods was 0.999, and the ratio of the results averaged 1.00 ± 0.02. Our study also revealed that the combined effect of Mg2+, Ca2+, OH, and HCO3 increases the settling time after the addition of pickling reagents. Overall, this modification represents a useful and labor-saving advancement in the determination of a classic oceanographic parameter, with potential for widespread adoption by scientists and technicians.

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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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