Control of the Composition of Welding Aerosols
Physicochemical properties of the solid component of welding aerosols (SCWA) are characterized. The features of the SCWA sampling and the methods most frequently used for SCWA analysis in domestic and foreign analytical practice are considered. Destructive and nondestructive methods of SCWA analysis are compared from the viewpoint of their advantages and shortcomings. It is shown that losses of the elements under control frequently observed upon decomposition of exposed filters are atributed to the complexity of the phase and chemical composition of the SCWA samples. Methods of developing synthetic calibration samples are discussed for both classes of methods considered: when using x-ray fluorescence method it is difficult to prepare the calibration samples adequate to the real SCWA samples collected on the filter, whereas in comparator variant of the neutron activation analysis synthetic mixtures containing one or two components are used to calculate the content of analytes. Metrological characteristics of the methods of SCWA analysis are presented.