Isotopic water-sample extraction and purification device

Abstract

The invention discloses an isotopic water-sample extraction and purification device which at least comprises a sample bottle, a heating device, a water-sample collector, a cold trap and a vacuum pump, wherein the air inlet end and air outlet end of the water-sample collector are respectively communicated with the air inlet ends of the sample bottle and the cold trap, and the air outlet end of the cold trap is communicated with the vacuum pump; and pistons are respectively arranged between the sample bottle and the water-sample collector and between the cold trap and the vacuum pump, a vacuum gauge connected with a vacuometer is arranged between the water-sample collector and the vacuum pump, and the water-sample collector and the cold trap are respectively sleeved with a cryogenic beaker. By using the device provided by the invention, sufficient water samples without isotope fractionation can be obtained from objects which are difficult to dehydrated, such as low-permeability geotechnical layers, organisms and the like, and the isotope fractionation is not be caused in the process of desalinating high-salinity water samples, therefore, the device provided by the invention can widely be applied to the scientific researches and productions in universities, research institutes, industrial and mining enterprises and the like.

Description

technical field [0001] The invention relates to an isotope water sample extraction and purification device, which is mainly used for pretreatment of H and O isotope composition tests of water, and belongs to the field of element test in chemistry. Background technique [0002] The H and O isotope composition of water is an important parameter in groundwater science, environmental science and biological science. To study how to obtain sufficient water samples without isotope fractionation from low-permeability rock and soil layers, organisms and other refractory water objects, It is of great significance and also a technical problem. In addition, due to the interference of salinity, when water samples with high salinity enter the isotope mass spectrometer (such as MAT253) for testing, it will not only seriously damage the expensive instrument, but also cause large errors. How to desalt the high-salinity water sample without causing isotopic fractionation of the water sample ...

AI Technical Summary

Problems solved by technology

The disadvantages of these methods are: the complete release of water cannot be realized, and the complete collection of released water cannot be realized, resulting in obvious isotope fractionation of the extracted water sample, and the obtained result does not represent its true value; for water samples with high salinity , also often adopt the method of high-temperature distillation, although it can reduce the salt content in water, but the water loss is serious during open condensation, resulting in obvious isotope fractionation, the test results are quite different from the original water sample H, O isotope composition

According to the existing data, 0.1% water loss of water samples will cause at least 10% difference in isotopic composition. The isotopic fractionation caused by this pretreatment has made the research on the change of isotopic composition of water samples meaningless.

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