Determination of Trace Metals in Crude oils by Nonflame Atomic Absorption Spectroscopy

Atomization in graphite-furnace atomic absorption spectrometry. Peak-height method vs. integration method of measuring absorbance. Carbon Rod Atomizer 63

“…Modifications made to the power supply of the CRA 63 to obtain a faster rate of heating and a higher final temperature (ca. 3800 K) have been described in a previous paper from this laboratory (16). Signals were detected with a Hamamatsu R446-NR photomultiplier tube which was enclosed within a magnetically and electrostatically shielded housing to reduce interferences.…”

Analytical parameters for determination of chromium in urine by electrothermal atomic absorption spectrometry

“…One straightforward means of altering the atom production environment is to change the sheath gas or combine two or more gases enveloping the atomizer tube. The addition of hydrogen to the inert sheath gas during ashing and atomization has been shown to enhance the signals obtained for some elements in a variety of matrixes (12)(13)(14). This improvement in sensitivities for some 14 elements has been attributed to the creation of a more reducing environment, facilitating atom formation processes.…”

“…The objective of this work has been to examine the interaction of various proteins with a chemically bonded diol phase. It is already known that separation speeds and column efficiencies with such packings are much improved over classical polysaccharide and polyacrylamide gels (13)(14)(15). The lack of wide adaption of the silica gel based packings appears to be due to the belief that some proteins interact excessively with the stationary phase and that the bonded phase has poor long term stability.…”