Method for simultaneously determining macroelements in ocean sediments through ICP-OES

Abstract

The invention relates to the field of geochemical analysis, in particular to a method for simultaneously determining macroelements in ocean sediments through an ICP-OES. The sample ocean sediments are added into an antiseptic efficient sample dissolution tank, sodium hydroxide and pure water are added, decomposition is performed for 12-24 h on the condition of the low temperature of 240-280 DEG C to form the aqueous alkali environment similar to the molten state, ocean sediment silicate in the sample is effectively molten, and finally an alkaline oxide on the aqueous alkali condition is obtained through decomposition, double decomposition is performed on the condition of hydrochloric acid after cooling is performed, and metal chloride is formed through complete dissolution, silicon is evenly distributed into the solution in the siliceous state, and then the macroelements in the sample are determined through the ICP-OES. According to the method, ocean sediments can be decomposed on the rapid, simple, low-temperature and closed alkaline condition, meanwhile, the method can also be applied to low temperature and alkali fusion of silicate samples, research and application of determining elements such as SiO2 on the closed, low-temperature and alkali fusion conditions are started, and the method has the wide application prospect in geological industry analysis.

Description

technical field [0001] The invention relates to the field of geochemical analysis, in particular to an ICP-OES method for simultaneously measuring constant elements in marine sediments. Background technique [0002] Constant elements play an important role in the scientific research of marine geology. According to their characteristics, their behavior characteristics in the geological process are clarified, and the migration mode of elements, chemical reaction process, and indication of geological processes are discussed. Therefore, the test of constant elements is particularly important. At present, The test methods for major elements are relatively mature, and generally use chemical wet method, gravimetric method, spectrophotometer method, ICP-OES and XRF to complete the determination of major elements in geological samples, among which ICP-OES and XRF methods are dominant, and ICP- The amount of sample used in OES method is small, but there are certain limitations in the ...

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Problems solved by technology

[0002] Constant elements play an important role in the scientific research of marine geology. According to their characteristics, their behavior characteristics in the geological process are clarified, and the migration mode of elements, chemical reaction process, and indication of geological processes are discussed. Therefore, the test of constant elements is particularly important. At present, The test methods for major elements are relatively mature, and generally use chemical wet method, gravimetric method, spectrophotometer method, ICP-OES and XRF to complete the determination of major elements in geological samples, among which ICP-OES and XRF methods are dominant, and ICP- The amount of sample used in OES method is small, but there are certain limitations in the determination of silica, which is mainly limited by the fusion method, and it is difficult to obtain a soluble solution suitable for ICP-OES testing. If the conventional alkali fusion method is used, it is limited by the container. Restrictions, while the number of batches is relatively small, a few or more than a dozen samples at a time, there is a certain risk and operational uncertainty, and high temperature melting is also easy to bring external pollution, generally using the combination of animal gel method and ICP-OES method to determine the constant elements in geological samples, the processing efficiency is slow, and it takes a lot of labor

The XRF method is relatively simple, but the processing speed is slow. It can process several samples at a time, and it also consumes a lot of manpower. In addition, the amount of samples is large, which makes it difficult to measure some precious samples.

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