Method for determining cesium and cesium compounds in air of workplace

Abstract

The invention discloses a method for determining cesium and compounds thereof in air of a workplace. The method comprises the following steps: sampling for a short time and a long time at a sampling point by adopting a sampling clamp provided with a microfiltration membrane; placing the sampled microporous filter membrane in a beaker, adding pure water and dilute nitric acid for digestion, and finally fixing the volume to a volumetric flask to keep the nitric acid acidity of 1% (v/v); analyzing the sample solution by adopting an inductively coupled plasma mass spectrometer, and determining the content of cesium and compounds thereof in the sample solution according to the spectral intensity; and calculating through a formula to obtain the concentration of cesium and cesium compounds in air. The method overcomes the defects of traditional cesium and cesium compound detection, avoids chemical interference and ionization interference, improves the elution efficiency of cesium in the microfiltration membrane, realizes analysis and determination of trace and ultra-trace cesium and cesium compound, and ensures the accuracy and reliability of caesium and cesium compound occupational hazard factor detection results in a precise cesium processing technology.

Description

technical field [0001] The invention relates to the technical field of environmental detection, in particular to a method for measuring cesium and its compounds in the air of a workplace. Background technique [0002] Cesium (without radioactive source cesium-137) is a low melting point metal and belongs to the alkali metals. Cesium is mainly dispersed in spodumene, lepidolite, and lepidolite, and exists in the same form as potassium, sodium and lithium in minerals such as potassium feldspar, amazonite, potassium salt and carnallite. The main industrial uses of cesium are in the manufacture of photovoltaic cells, photomultiplier tubes and television camera tubes and as a getter for vacuum tubes. Cesium iodide, activated by sodium and thallium, can be used to make X-ray image magnifying panels or fluorescent screens for industrial and medical use. The artificial cesium ion cloud formed by cesium can transmit and reflect electromagnetic waves. Cesium is used as a co-catalys...

AI Technical Summary

Problems solved by technology

In addition, because cesium is very easy to ionize, it will cause the weakening of the atomic spectral line, and the coexistence of easily ionizable elements will increase the intensity of the atomic spectral line of cesium, which will make the analysis result higher and cause positive interference.

In order to eliminate ionization interference, it is necessary to add a sufficient amount of potassium chloride as an ionization agent to eliminate the ionization interference of coexistent substances, so the increased solvent elution process to eliminate ionization interference will also affect the precision of the method

The third is the problem of pretreatment efficiency of the method. The sample pretreatment of this method is to add 9.0mL water to a stoppered graduated test tube equipped with a microporous membrane, elute for 10min, and shake it from time to time.

Based on the above three points, this technical method is not completely suitable for the determination of the content of cesium and its compounds in all workplaces

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