Methodological aspects of methylphosphonic acid analysis: Determination in river and coastal water samples.,Talanta

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Methodological aspects of methylphosphonic acid analysis: Determination in river and coastal water samples.
Talanta ( IF 5.6 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.talanta.2020.120724
Constantin Lohrer ₁ , Paul P Cwierz ₁ , Marisa A Wirth ₁ , Detlef E Schulz-Bull ₁ , Marion Kanwischer ₁

Affiliation

Methylphosphonic acid (MPn) is suspected to play an important role in aquatic systems like rivers or the open ocean. To gain more insights into the importance of MPn, e.g., for the aquatic phosphorus cycle, an analytical method for its quantitative determination was developed. The method is based on the use of an isotopically-labelled internal standard and sample preparation including solid-phase extraction (SPE). Instrumental detection was done using GC-MS after derivatisation of MPn with N-tert-Butyldimethylsilyl-N-methyltrifluoroacetamide (MTBSTFA). The study compares different isotopically-labelled compounds as well as different SPE-materials. As water samples with high salt content decrease the recovery of the chosen SPE-material, a desalting procedure using electrodialysis was implemented. Finally, water samples from different aquatic systems located at the German Baltic Sea coastal area were analysed to gain first insights into the relevance of MPn in these systems. MPn-concentrations in the low μg/L-range were detected.

中文翻译：

甲基膦酸分析的方法学方面：河流和沿海水样中的测定。

甲基膦酸（MPn）被怀疑在河流或大海等水生系统中起重要作用。为了获得更多关于MPn重要性的见解，例如对于水生磷循环，开发了一种定量测定MPn的分析方法。该方法基于使用同位素标记的内标和包括固相萃取（SPE）在内的样品前处理。用N-叔丁基二甲基甲硅烷基-N-甲基三氟乙酰胺（MTBSTFA）衍生MPn后，使用GC-MS进行仪器检测。该研究比较了不同同位素标记的化合物以及不同的SPE材料。由于高盐含量的水样品降低了所选SPE材料的回收率，因此实施了使用电渗析的脱盐程序。最后，分析了位于德国波罗的海沿岸地区不同水生系统的水样，以初步了解MPn在这些系统中的相关性。检测到低μg/ L范围内的MPn浓度。

更新日期：2020-01-07

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