Analytical Sciences

Effects of Mechanical Vibration during Drying of Solution Sample in Enhancing the Sensitivity of Total Reflection X-ray Fluorescence Analysis

Taishiro SUGIOKA, Hiroki UMEDA, and Shinsuke KUNIMURA

Department of Industrial Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan

This study describes a sample preparation method for trace element analysis using total reflection X-ray fluorescence analysis. The procedure of this method is as follows: 1) a hydrophobic-coated sample holder whose hydrophobic film at around the center of the surface is partially dissolved by acetone is prepared; 2) a droplet of a sample solution is dropped on the sample holder; and 3) the sample droplet is heated and dried while vibrating it. This sample preparation method is effective for reducing the size of the dry residue of the sample solution and suppressing the coffee-ring formation. Furthermore, this method leads to an enhancement in the intensity of an X-ray fluorescence line from an analyte element in the sample residue. In this study, this sample preparation method led to an improvement in the detection limit for vanadium in commercially available bottled drinking water.

J-STAGE: View this article in J-STAGE