a novel, simple, sensitive and effective method has been developed for preconcentration of hg(ii) on nano-fe3o4-dop-ed solid-phase extraction adsorbent. in this paper, dioctyl phthalate (dop) was used to encapsulate nano-fe3o4 and produce a nano-fe3o4-dop sorbent based new sorbent was prepared. this was treated with ethylenediamine (ed) in another solvent-free procedure for the formation of a n...

We compared two methods for determination of serum zinc by flame atomic absorption spectroscopy. The first involved 10-fold dilution of serum with water; the second, deproteinization of serum with trichloroacetic acid. Analytical recovery of Zn2+ added to serum averaged 99.3 and 99.9%, respectively, by the two methods, but measured concentrations were consistently greater by the second method [...

BACKGROUND The aim of this paper was the validation of a new analytical method based on the high-resolution continuum source flame atomic absorption spectrometry for the fast-sequential determination of several hazardous/priority hazardous metals (Ag, Cd, Co, Cr, Cu, Ni, Pb and Zn) in soil after microwave assisted digestion in aqua regia. Determinations were performed on the ContrAA 300 (Analyt...

We sought to establish optimum conditions for measuring calcium in erythrocytes by atomic absorption spectrophotometry. The conditions we selected are as follows. Wash one volume of fresh heparin-treated packed cells once with 30 volumes of isotonic buffered saline (pH 7.4) at a temperature somewhat exceeding 25 degrees C. Dilute the washed packed cells 10-fold with 12 mmol/L hydrochloric acid,...

Platelets, mononucleated cells, polymorphonucleated cells, and erythrocytes were separated from whole blood by use of discontinuous gradients of colloidal polyvinylpyrrolidone-coated silica ("Percoll"). We measured the zinc content of these cells by flame atomic absorption spectrophotometry, using a modified technique for micro-samples that obviated matrix interferences. Thus, results obtained ...

Four tests for the evaluation of lead poisoning are reviewed from both the clinical and methodological aspects. Whole blood or erythrocyte lead measurements appear to provide the best means of assessing the bodily burden of lead with electrothermal and Delves cup flame atomic absorption spectorphotometric techniques providing accurate and precise results. Urine lead is less reliable as a screen...

To investigate the conditions of microwave digestion for determining Iron in milk powder by flame atomic absorption spectrophotometry(FAAS), the content of iron in milk powder was determined by flame atomic absorption spectrophotometry after the samples were microwavely digested under different conditions. The optimum parameters for microwave digestion were obtained by the orthogonal test at la...

A simple and sensitive method is described for the determination of trace lead in Chinese herbs by derivative atom trapping flame atomic absorption spectrometry (D-AT-FAAS) with a modified water-cooled quartz atom-trapping tube. The effects that influence the sensitivity of the derivative method, such as the trap position, the flame conditions and the collection time, were studied. The characte...

The analysis of solutions containing appreciable amounts of dissolved solids by flame atomic absorption requires careful consideration of the solution chemistry and sample preparation as well as an informed choice of instrumental operating conditions in order to obtain reliable results. A common problem is the physical obstruction of parts of the flame atomizer by salt accumulation which leads ...