Method for improving measurement accuracy of concentration of dissolved gas in water

Abstract

The invention discloses a method for improving the measurement accuracy of the concentration of dissolved gas in a water body. After water sample collection, an in-situ water body is measured immediately by using a portable dissolved oxygen tester; the water temperature and salinity of the in-situ water body are measured at the same time; the atmospheric pressure at the same time of sampling is recorded; an ideal storage temperature of the water sample is calculated by adopting a Weiss formula according to the data; a water sample bottle is arranged into temperature control equipment, and thetemperature of the temperature control equipment is adjusted to the ideal storage temperature, so as to carry out long-distance transportation and long-time storage. According to the invention, a problem of low accuracy of directly measuring the concentration of dissolved gas in a water sample by using a membrane sample introduction mass spectrometer when the water sample collected from the fieldenters a laboratory is solved; in the process of storing and transporting a water sample collected in the field to a laboratory for measurement, the content of original dissolved gas in the collectedwater body can be kept as much as possible, the disturbance influence of external factors is reduced, and the accuracy of dissolved gas concentration and saturation measurement is improved.

Description

technical field [0001] The invention belongs to the field of dissolved gas measurement in water bodies, and in particular relates to a method for improving the measurement accuracy of dissolved gas in water bodies. Background technique [0002] Dissolved gases in water are mainly dissolved nitrogen and dissolved oxygen. Due to the high dam discharge, the dissolved nitrogen and dissolved oxygen in the downstream water body will usually be supersaturated, and the dissolved gas supersaturation in the water will usually cause fish to suffer from air bubble disease, which may lead to death in severe cases; various water pollution will lead to low dissolved oxygen in the water body. Low, the water body becomes black and smelly, leading to the deterioration of the water environment. Whether the water body is oversaturated with dissolved gas or undersaturated with dissolved gas, it will lead to water environmental problems. [0003] In order to assess the impact of dissolved gases...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for improving the accuracy of dissolved gas concentration measurement in water bodies, aiming at the problem that the existing water samples collected from the field enter the laboratory and directly use a membrane sample mass spectrometer to measure the dissolved gas concentration in the water sample. This method enables the water samples collected in the field to maintain the original dissolved gas content (concentration) of the collection site during storage and transportation to the laboratory for measurement, reduce the disturbance of external factors, and improve the accuracy of dissolved gas concentration measurement

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