نتایج جستجو برای: atomic absorption spectrometer

تعداد نتایج: 231408  

Journal: :Analytical chemistry 2005
Jennifer A Rust Joaquim A Nóbrega Clifton P Calloway Bradley T Jones

The dark lines in the solar spectrum were discovered by Wollaston and cataloged by Fraunhofer in the early days of the 19th century. Some years later, Kirchhoff explained the appearance of the dark lines: the sun was acting as a continuum light source and metals in the ground state in its atmosphere were absorbing characteristic narrow regions of the spectrum. This discovery eventually spawned ...

2014
Phuong Truong John Cauduro

Major elements such as calcium, magnesium, sodium and potassium are essential nutrients in food and the routine monitoring of the levels of these elements in fruit juices is a common quality control process. Flame Atomic Absorption Spectroscopy (FAAS) is well suited to this application as it delivers the performance required for the analysis at a reasonable price. However, with the introduction...

2005
Joaquim A. Nóbrega Jennifer Rust Bradley T. Jones

O desempenho de um espectrômetro de absorção atômica com filamento de tungstênio, fonte contínua de deutério, monocromador Czerny-Turner e um detector de estado sólido foi avaliado para Zn. As principais características do instrumento são a simplicidade de operação e o custo relativamente baixo. Apesar do alto limite de detecção (40 μg L, 3 desvio padrão do branco/coeficiente angular), Zn foi d...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2005
Jennifer A Rust Joaquim A Nóbrega Clifton P Calloway Bradley T Jones

A continuum-source tungsten coil electrothermal atomic absorption spectrometer has been assembled, evaluated, and employed in four different applications. The instrument consists of a xenon arc lamp light source, a tungsten coil atomizer, a Czerny-Turner high resolution monochromator, and a linear photodiode array detector. This instrument provides simultaneous multi-element analyses across a 4...

Journal: :Spectrochimica Acta Part B: Atomic Spectroscopy 1982

Journal: :Talanta 2004
M Zougagh A García de Torres E Vereda Alonso J M Cano Pavón

A simple, sensitive, low-cost and rapid, flow injection system for the on-line preconcentration of lead by sorption on a microcolumn packed with silica gel funtionalized with methylthiosalicylate (TS-gel) was developped. The metal is directly retained on the sorbent column and subsequently then eluted from it by EDTA. Five variables (sample flow rate, eluent flow rate, eluent concentration, pH ...

Journal: :مجله دانشگاه علوم پزشکی شهید صدوقی یزد 0
حسین پورمقدس h pourmoghaddas احمدرضا پیشکار ar pishkar فخرالملوک کاوه زاده f kavehzadeh

introduction: recent investigations have detected the presence of significant levels of heavy metals (chromium, lead and cadmium) in toys and other pvc products manufactured for children. in some countries, addition of compounds containing toxic metals to toys are limited or prohibited. methods: to evaluate the safety of some of the plastic toys in the city of isfahan with respect to toxic trac...

Journal: :journal of the iranian chemical research 0
majid ramezani department of chemistry, faculty of science, islamic azad university – arak branch, arak, iran sara rahmani department of chemistry, faculty of science, islamic azad university – arak branch, arak, iran

an efficient, rapid, simple, and highly selective dispersive liquid–liquid microextraction basedon solidification of floating organic drop (dllme-sfod), combined with flame atomicabsorption spectrometry was developed for preconcentration and determination of trace amountsof cobalt in water samples. in this method, an appropriate mixture of acetone and1-undecanol was injected rapidly into the aq...

Journal: :journal of pharmaceutical and health sciences 0
parisa ziarati pharmaceutical sciences branch, islamic azad university shermin divanian pharmaceutical sciences research center, pharmaceutical sciences branch, islamic azad university, tehran-iran (iaups) 2behrouz adergani akbari food quality and safety laboratories, food and drug organization, ministry of health and medical education, tehran-iran

current study was done to determine the concentration of heavy metals including lead and cadmium and nutrients element copper and zinc in a simple and whole wheat macaroni in the valid different supermarkets in the city of tehran. 254 samples from seven iranian simple macaroni , four foreign simple macaroni and two iranian whole wheat macaroni were purchased consecutively in 3 seasons of 2015. ...

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