Chemofiltration of mercury water samples through zinc sulfide layer and determination by wavelength-dispersive X-ray fluorescence spectrometry

Quantitative X-ray fluorescence analysis of samples of less than ‘infinite thickness’: Difficulties and possibilities

“…In contrast to the E-T method, the absorption correction can be performed if secondary enhancement effects are negligible. E-T and 2M methods were applied for the investigation of chemofiltration of Hg solutions through a ZnS thin layer [109]. The E-T method can be applied for the analysis of sample pressed into pellets with intermediate thickness or samples collected onto filters e.g.…”

Atomic spectrometry update—X-ray fluorescence spectrometry

“…An overview of preconcentration techniques for the determination of uranium and thorium was presented by Rao et al 180 Various methods were critically assessed in terms of enrichment factor, retention/sorption capacity, validation using CRMs and application to complex real samples. Sitko et al 181 were advocates of chemofiltration through zinc sulfide on to a membrane filter and this year turned their attention to the analysis of mercury in water. Analysis of both sides of the filter indicated that the ion exchange took place on the surface and consequently mercury was collected as a thin layer of mercury sulfide on the zinc sulfide.…”

Preconcentration of Trace Amounts of Zinc and Copper from Water Samples onto Polystyrene Foils Prior to Determination by Wavelength-Dispersive X-ray Fluorescence Spectrometry

“…The most commonly used reagents are diethyldithiocarbamate (DDTC, NaDDTC), ammonium pyrrolidine dithiocarbamate (APDC, PDTC), and 1-(2-pyridylazo)-2-naphthol (PAN). 18,19 Other preconcentration methods such as ion-exchange, 20 chemofiltration, 21 and applying exchange resins 22 are also used in most cases. Activated charcoals, 23 as well as powdered polyurethane foams, 24 are applied to concentrate metals prior to their determination by XRF.…”