X-ray methods for quantitative determination of inorganic fillers in paper

Abstract

. 63, 243 (1985). X-ray diffraction methods have been investigated as means of quantifying filler contents of paper. Both an "internal standard method" and an "absorption-diffraction method" were applied. Because of preferential orientation of the filler particles in commercial paper samples, the "internal standard method" was modificd to include an empirical evaluation of the proportionality constant, K . Values of K specific for each filler material investigated (clay, calcite. talc, and titanium dioxide) were obtained by X-ray diffraction intensity measurements on standard papers containing different amounts of each filler. These values of K were then used to calculate the filler content of various commercial papers. The filler contents of these same commercial papers were also determined using the X-ray "absorption-diffraction method" and ash determination. Comparisons made among results from all these methods indicated that both X-ray methods give acceptable agreement with ash determination, but that the "absorption-diffraction method" is preferred due to its ease of application. In addition, the X-ray methods are more rapid and versatile than ash determination. 243 (1985). Deux mCthodes de diffraction des rayons-X, "mCthodc du standard interne" et "absorption-diffraction," ont C t t utilistes pour la quantification des pigments inorganiques dans le papier. A causc dc la presence d'une orientation prtftrentielle des particules de pigments dans des feuilles de papier commerciaux, la "mCthode du standard interne" a CtC modifiCe en utilisant une tvaluation empirique de la constante dc proportionalitt K . Pour chaquc pigment ttudit (argile, calcite, talc et dioxide de titane) une valeur de K a C t t obtenue par la mesure des intensitts rayons-X obtcnus dc papicrs exptrimentaux qui contenaient difftrentes quantitts dc pigments. Ces valcurs dc K ont ensuite tt6 utilisees pour Cvaluer la quantitt en pigments dans des papiers commcrciaux. Les contenus en pigments de ces dernicrs ont Cgalement tte dttcrmints par la mtthode "absorptiondiffraction" et par dttermination des cendres. Aprks comparaison des rtsultats obtenus par ces trois mtthodes, il apparait que la mtthode "absorption-diffraction" soit prtftrte h cause de sa facilitt d'application. De plus, les mirthodes utilisant la diffraction des rayons->( sont plus rapides et plus versatiles quc la mtthode classique de determination des cendres.

Research review on devices and methods for rapid measurement of paper ash

“…When using the online measurement method to measure paper ash, only the total ash can be determined, and ash components cannot be qualitatively and quantitatively analyzed. Bluhm et al (1985) used the powder X-ray diffraction to quantitatively analyze the inorganic filler in paper. However, the error was so large that this method cannot meet the requirements of ash measurement.…”