Abstract
A novel home-made H2SO4-Nafion (HN) tube sampling system coupled to a line ion trap mass spectrometer (LTQ-MS) with a versatile ambient ionization source, hectowatt microwave plasma torch (HMPT), has manifested unique advantages for picking directly metal elements in aqueous samples and acquiring the fully characteristic MPT mass spectra of copper and zinc composite ions. Here, we report the development of a novel HN-HMPT-LTQ-MS for metal elements assay based on environmental water to analyze samples of Poyang Lake, China. Detailed multi-stage tandem mass spectra show that the general structural form of target ions is [M(NO3)x(H2O)y(OH)z]+ for the positive ion mode. Under the optimized conditions, the proposed method provided low limits of detection (LODs) of 0.23 μg.L−1 for 63Cu+ and 1.1 μg.L−1 for 66Zn+, with relative standard deviations (RSDs) of less than 12.7% by MPT-LTQ-MS. This new result has met the requirements of national standards (GB 5750.6–2006) and is only about one magnitude order larger than the LOD of ICP-MS method. A wide linear response range of about 4 orders of magnitude for the method with linear coefficients (R2) of 0.99709 – 0.99962 for copper and zinc tested was in accordance with that of ICP-MS. Except for the recovery of 79% for the third sample and 123.8% for the seventh sample, the present method also provided good recoveries (84 – 119.3%) in spiked 10 batches of drinking water samples. Furthermore, it is envisioned that the developed approach might build a powerful hectowatt-MPT-MS platform for food security detection, drug analysis, and origin traceability.
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Acknowledgements
The corresponding authors are grateful for the kindly discussion and assistance from Guangdong Provincial Engineering Research Center for On‐line Source Apportionment System of Air Pollution.
Funding
This work was supported by the National Key Research and Development Project (No. 2017YFF0106002), Chinese National Science Foundation (No. 21866027), Guangzhou Development Zone International Science and Technology Cooperation Project (No. 2018GH08), Guangdong International Science and Technology Cooperation Project (No. 2018A050506020), and Key Special Project of “Pollution Prevention and Remediation” of Guangdong Province Key Field R&D Program (No. 2019B110206001).
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Jiang, T., Jiang, F., Zhong, Y. et al. A home-made sampling system coupled to hectowatt-MPT mass spectrometry in positive ion mode to confirm target ions of copper and zinc from Poyang Lake, China. Anal Bioanal Chem 414, 6115–6126 (2022). https://doi.org/10.1007/s00216-022-04172-7
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DOI: https://doi.org/10.1007/s00216-022-04172-7