𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Determination of soluble chromium(VI) in chromium plating mist by X-ray spectrometry

✍ Scribed by James A. Hurst


Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
536 KB
Volume
334
Category
Article
ISSN
0003-2670

No coin nor oath required. For personal study only.

✦ Synopsis


A wavelength dispersive X-ray fluorescence spectrometry (XRP) method is described for the analysis of soluble chromium(V1) in chromium plating mist collected from workplace air. Calibration of the XRF for soluble chromium(VI) is achieved by using dibenzyldithiocarbamate chromium precipitates prepared from a solution of potassium dichromate. Samples for analysis are collected on PVC filters and directly analysed for total chromium to screen out negative samples. Positive chromium sample filters are then placed in distilled water buffered to pH 4 and the dibenzyldithiocarbamate precipitate of the soluble chromium(V1) is prepared. The precipitate is then collected on a cellulose acetate filter and analysed for cbromium(V1) by XRP after mounting between polypropylene film. The procedure was found to be rectilinear up to 100 ug chromium(V1) with a detection limit of 0.04 ug at the 99% confidence limit. Precision studies of the precipitation procedure produced a result of 1.5% coefficient of variation at a level of 20 ug chromium(V1) in water. Interference studies of the procedure showed that chromium(II1) did not form a precipitate with the dibenzyldithiocarbamate reagent. Recovery studies of chromium(V1) dust produced results for recovered chromium(V1) between 79% and 95% with a mean recovery of 87%. The method was applied to samples collected from decorative chrome plating works.


πŸ“œ SIMILAR VOLUMES


The determination of nanogram amounts of
✍ Klaus Beyermann; Harry J. Rose Jr.; Ralph P. Christian πŸ“‚ Article πŸ“… 1969 πŸ› Elsevier Science 🌐 English βš– 445 KB

THE I~ETEKMINATION OF N\_4NOGlL4M AMOUNTS OF CHROMIUM IN URINE 13Y X-RAY I~LUORESCENCE SPIXTROSCOl'Y \* Chromium lias been recognized as an essential trace elcmentl in glucose metabolism. Recausc cl~romiuin is normally present in biological materials at concentrations of IO--100 ppb., sensitive and

Determination of trace amounts of chromi
✍ Catherine Elleouet; FranΓ§ois Quentel; Christian Madec πŸ“‚ Article πŸ“… 1992 πŸ› Elsevier Science 🌐 English βš– 555 KB

A sensltlve procedure for the determmatlon of chronnum(VJ) 1s described A chelate of chronuum with an orgamc hgand IS adsorbed on a hangmg mercury drop electrode and the reduckon current of the accumulated chelate LY measured by dlfferentlal-pulse voltammetry The effects of various parameters (pH, h

The determination of chromium(III) and c
✍ M.S. Cresser; R. Hargitt πŸ“‚ Article πŸ“… 1976 πŸ› Elsevier Science 🌐 English βš– 195 KB

The determination of chromium by atomic absorption spectrometry (a-a-s.) does not discriminate between the various oxidation states of the element. Recently, a method was required for the rapid dctcrmination of the concentrations of each of the two main oxidation states of chromium in soil cstracts,