PURPOSE: To dispense with measurement at every exchange of a filter for quantitative determination and measure a toxical substance with simpler procedures by using a reference filter and a filter for quantitative determination of nearly the same area, and measuring and computing weights, X-ray diffraction line intensity, and the like. ;CONSTITUTION: X-ray diffraction line intensity Is00 only at a base reference plate A is obtained. The weight Mr of a reference filter B is measured, and diffraction line intensity Isr is measured in the condition in which the filter B is mounted on the plate A. Next the weight Mi of a filter C for quantitative determination and the weight Mmi of that after catching a sample are measured, the filter C is mounted on the plate A so as to cast X-ray on them, and the X-ray diffraction intensity Imi of free silicic acid is measured. Next the diffraction line intensity Isi of the plate A is measured. Because the filter C of the same area as that of the filter B is used, the intensity Isi of the plate A can be theoretically obtained only by measuring the intensity Is00 of the plate A only, the intensity Isr of the plate A in the condition of mounting the filter B, the weights Mr/Mi of the filter B/filter C. Is00, Isr, Mr are peculiar to the filter B of plate A, and hence the measurement is enough by only one time.;COPYRIGHT: (C)1995,JPO
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