Pretreatment method and pretreatment system for detecting radium content in liquid

Abstract

The invention relates to a pretreatment method for detecting radium content in liquid, which comprises the following steps: measuring the hardness of a liquid sample to be detected, feeding back a measurement result X to a central control unit, calculating the dosage V of EDTA-2Na required to be added according to a pre-stored dosage calculation formula of EDTA-2Na, heating and stirring the liquid sample to be detected, and calculating the radium content of the liquid sample to be detected according to the dosage V of the EDTA-2Na required to be added. Sequentially adding a predetermined amount of barium chloride solution and sulfuric acid solution into the sample; standing the tested sample to obtain barium sulfate radium precipitate, removing supernate, leaving a small amount of tested sample and precipitate, adding an EDTA-2Na solution with the dosage of V into the tested sample and precipitate, and heating until the precipitate is completely dissolved; according to the pretreatment method for detecting the content of the radium in the liquid, manual work is replaced for automatic sample pretreatment, the labor cost is reduced, meanwhile, the dosing precision is improved, and it is guaranteed that precipitated radium is completely dissolved; dosing at different stages is separated by moving the position of the reaction device, so that cross contamination among samples is effectively avoided.

Description

technical field [0001] The invention belongs to the field of liquid measurement and analysis, and in particular relates to a preprocessing method and a preprocessing system for detecting radium content in liquid. Background technique [0002] At present, the commonly used radium-226 detection methods include emanation scintillation method, gamma energy spectroscopy, liquid scintillation counting method, alpha energy spectroscopy method and alpha counting method, among which emanation scintillation method is a classic detection method of radium-226, and its development is relatively mature . The emanation scintillation method is still the most used in my country's relevant testing standards. First, the sample is pretreated to form a precipitate and then separated. After the precipitate is dissolved, it is placed in a diffuser to accumulate radon-222. After the progeny is balanced, it is detected on a radon-thorium analyzer, and then the radioactivity of radium-226 is calculat...

AI Technical Summary

Problems solved by technology

The whole process of radium measurement sample pretreatment in drinking water is carried out manually by the experimenter, without automatic equipment, radium radiation not only causes some personal injury to the experimenter, but also introduces human errors into the experimental results

Moreover, the experiment process is limited by the work and rest of the operator, so it cannot be carried out continuously, which is time-consuming and labor-intensive

On the other hand, since the concentration of heavy metal ions in the sample cannot be predicted in advance, the amount of EDTA-2Na (disodium ethylenediaminetetraacetic acid) added is not easy to control, resulting in incomplete dissolution and precipitation of heavy metal ions in the sample or excessive EDTA-2Na residues. Increase testing cost

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