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The standard specifies environmental protection, management and monitoring, and marine ecological impact assessment in terms of seawater quality/marine sediment/marine ecology.

The analysis of inorganic elements in seawater has important scientific and practical significance for understanding the functions of marine ecosystems, protecting the marine environment, assessing the impact of human activities, and predicting climate change. The necessity of elemental analysis in seawater is reflected in the following aspects:

Biogeochemical cycleInorganic elements, especially trace metal elements, in seawater play an important role in the biogeochemical cycling processes of marine organisms. These elements are involved in all aspects of marine life, from the formation of cytoplasm in primary productivity to protein synthesis. For example, some trace metals such as Fe, Ni, Cu, and Zn are crucial for the growth of organisms.

Ecosystem Health:Some inorganic elements in seawater are essential trace elements for the growth of marine organisms, directly affecting the growth and carbon and nitrogen fixation of marine phytoplankton, and are key regulatory factors for primary productivity in the ocean. Meanwhile, the concentration changes of these elements are also related to the health of marine ecosystems.

Pollution monitoringSome inorganic elements in seawater, such as lead, are mainly pollutants emitted by human activities. Monitoring these elements helps evaluate the impact of human activities on the marine environment and provides scientific basis for pollution control.

01

As is well known, ICP-MS is a powerful tool for elemental analysis. Compared with other technologies, it has the ability to simultaneously analyze multiple elements, a wide linear range, fast testing speed, low quantification limit, and strong specificity. butThe main challenge faced by ICP-MS analysis of seawater with a salt content exceeding 3% is how to reduce matrix effects and signal driftTo ensure accuracy and long-term stability of data.

02

This article analyzes Cr, Ni, Cu, Zn, As, Cd, and Pb in coastal seawater from a certain location in Guangdong without any treatment. The focus is on investigating the recovery rates of seven elements using iQuad 2300 without matrix matching and only using external standard method, as well as the recovery rates of internal standards.

Using Hansel iQuad 2300 ICP-MS to analyze 7 elements in undiluted seawater, the internal standard recovery rate remained stable around 100%, the spiked recovery rate was good, and mass spectrometry interference was well suppressed.

The unique electronic dilution design of iQuad 2300 can remove multi atomic ion mass spectrometry interference at the same flow rate, while distinguishing the degree of mass spectrometry interference experienced by different elements, achieving targeted and differentiated anti-interference effects.

Under such stable internal standards, the matrix effect has been effectively controlled; In order to further quantitatively verify the elimination of matrix effects, a 10 μ g/L mixed standard of elements was added to blank seawater, resulting in a spiked recovery rate of 92% -103%. In this experiment, the matrix effect caused by seawater has also been well resolved. The specific content can be downloaded and viewed in the original text.

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