Porovnání infračervených spekter anorganických práškových materiálů získaných dvěma různými měřicími technikami (technikou bromidových tablet a technikou ATR)

Abstract

This bachelor thesis focuses on the comparison of two measurement techniques for solid powder materials in the mid-infrared region. These are the bromide tablet technique and the attenuated total reflection technique. The observed values are compared with each other. The bromide tablet method is commonly used in quantitative analysis for the measurement of powdered materials, but it is preparation intensive. The attenuated total reflection technique is suitable for highly absorbent samples and has the advantage of minimal preparation for measurement. The bromide tablet method is much more accurate than the attenuated total reflection technique, but the difficulty of preparation and speed of measurement is more suitable for the attenuated total reflection method where preparation is minimal. Two powder samples were used for the measurements. These were sodium thiosulphate and kaolinite. The repeatability results of both methods were obtained and compared with each other. The bromide tablet method was found to be more accurate than the attenuated total reflection technique. The repeatability for both samples by the bromide tablet method was around 10–16 %. The repeatability of the attenuated total reflection technique was around 3-31 % for the kaolinite sample and as high as 45-58 % for the thiosulfate sample, where the repeatability value is too high.