螢光X線分析法による金属玩具用塗料中の鉛の定量

概要

論文の詳細を見る
The presence of lead in Japanese metallic toy paints, which was once claimed to be very harmful, has been successfully controlled by X-ray fluorescence method since 1958, and then, no Japanese toys carry dangerous amount of lead in their paint films, whatsoever. An accurate and rapid method of determination of lead in paints was developed by using a new type of dilution technique for liquid samples on the application of X-ray fluorescence method. Intensity measurements of Pb Lα1, lines from plain lead plate, (Ipb)0, paint sample, Ipb, and diluted paint sample, (Ipb)D, by lead-free paint with dilution ratio D, which is weight ratio of sample to sample plus diluent, are only necessary to make a basic equation (8) of this new method, in which undesirable absorption effects would never appear for different matrix composition, whereas absorption parameter β of diluent, ratio of mass absorption coefficient of diluent to lead for the case, takes an important role, like as in the method of Beattie and Brissey. Absorption parameter of diluent can be easily determined by mixing an known amount of lead into the diluent and using the method based on equation (6). The method was rapid enough to need only ten minutes for the analysis of a sample and was found to be accurate to 2.5% of the amount present for the range of 0.47% Pb in various kinds of metallic toy paints.
社団法人日本分析化学会の論文