Determination of the zeolite and silicate content in detergent products by wavelength-dispersive x-ray fluorescence spectrometry

Abstract

A method was developed for the determination of zeolite and silicate in detergent products and raw materials by wavelength‐dispersive x‐ray fluorescence (WDXRF) spectrometry. Al, Si and Na were measured after fusion of the sample with a mixture of lithium tetra‐ and metaborate. The influence of the fusion conditions, the stability of the glass beads and calibrations using practical and calculated α values were studied. The WDXRF method was validated by analysing laundry detergent products and zeolite and sodium silicate raw materials. The detection limit was 0.012% for Al, 0.010% for Si and 0.020% for Na (= 0.05% anhydrous zeolite and 0.08% sodium disilicate). The precision was dependent on the homogeneity of the sample. For Al, Si and Na in zeolite, the long‐term precision was 0.08, 0.09 and 0.10%, respectively. For detergent powders, maximum relative standard deviations of 0.2, 0.3 and 0.7% were found for Al, Si and Na, respectively. No significant difference was found between the WDXRF method and the reference methods (titration, gravimetry, flame atomic absorption spectrometry). Copyright © 2000 John Wiley & Sons, Ltd.

Converting Spent LiFePO4 Battery into Zeolitic Phosphate for Highly Efficient Heavy Metal Adsorption

“…32 With the above background, it is urgent to develop novel and simple environmentally friendly techniques to recycle and transform the spent LIBs and apply the converted materials to environmental governance to realize the transformation from "trash to treasure". As a critical material class, zeolite plays vital roles in various industrial processes, such as oil refinery catalyst, 33 membrane materials, 34,35 laundry detergent, 36,37 medical loading substance, 38,39 etc. Among all of the different elements used in zeolite synthesis, alkaline cations are frequently employed as counter cations to balance the framework charges, while Si, Al, P, and O are usually used to construct the zeolitic framework.…”

“…As a critical material class, zeolite plays vital roles in various industrial processes, such as oil refinery catalyst, membrane materials, , laundry detergent, , medical loading substance, , etc. Among all of the different elements used in zeolite synthesis, alkaline cations are frequently employed as counter cations to balance the framework charges, while Si, Al, P, and O are usually used to construct the zeolitic framework. − Moreover, transition metal cations may be doped into the framework to optimize the dedicated performance of specific zeolite framework materials.…”