نتایج جستجو برای: cold vapor atomic absorption spectroscopy cv aas

تعداد نتایج: 516598  

Journal: :Talanta 1977
P E Moloughney

A simplified scheme, combining aspects of the classical fire-assay with an atomic-absorption finish, is presented for the determination of gold and silver in ores and concentrates. The lead assay button is scorified to approximately 2 g and then parted in nitric acid. The filtrate is analysed by AAS for silver; the residue is dissolved in aqua regia and subsequently analysed for gold by AAS. Th...

2006

Spark source mass spectrometry (SSMS) and atomic absorption spectrometry (AAS) have played important roles as powerful analytical tools. Both these techniques have undergone significant improvements since the late fifties in instrumentation and methodology leading to their application in various branches of science and te chnology. These techniques can be regarded as complementary techniques in...

2009
David Patterson Julia Rasmussen John M Doyle

We realize a continuous, intense, cold molecular and atomic beam source based on buffer-gas cooling. Hot vapor (up to 600K) from an oven is mixed with cold (15K) neon buffer gas, and then emitted into a high-flux beam. The novel use of cold neon as a buffer gas produces a forward velocity distribution and low-energy tail that is comparable to much colder helium-based sources. We expect this sou...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد علوم دارویی - دانشکده داروسازی 1391

اهداف: هدف از این مطالعه بررسی سلامت مصرف کننده از نظر میزان آلودگی کنسروهای ماهی تون به فلزات سنگین کادمیوم ، سرب ، آرسنیک و جیوه می باشد. روش کار: آماده سازی نمونه ها به روش هضم مایکروویو و توسط دستگاه microwave digestion صورت گرفت. سپس مقادیر کادمیوم و سرب به روش طیف سنجی جذب اتمی کوره گرافیتی (graphite furnace atomic absorption spectrometry) اندازه گیری شد. میزان آرسنیک موجود در نمونه ها ...

2013
A. A. Raheem O. A. Olowu

The use of clay materials for the production of emulsion paints was investigated. Two types of clay: White tinged with Purple and Smooth clay (WSP) and Grey Brown and Coarse clay (GBC), were used for the production of Emulsion Clay Paints (ECP). Conventional Chemical pigmented Paint (CP) was also produced as a control. Atomic Absorption Spectroscopy, (AAS) was used to determine the chemical com...

2015
Kumari Shweta Harit Jha

A novel lignosilicate (LS) composite was synthesized from pre-extracted (hot water, 80% ethanol, 0.3 N NaOH) lignin of rice husk (RH) using TEOS as matrix. The extracted lignins were subjected to surface modification by acetylation followed by in situ synthesis of lignosilicate (LS) composites by sol-gel method for application in nickel removal. LS were characterized by FT-IR, scanning electron...

2016
Syed Shameer

Extracellular Polysaccharides (EPS) from both prokaryotes and eukaryotes have a great deal of research interest as they protect the producer from different stresses including antibiotics, ionic stress, desiccation and assist in bio-film formation, pathogenesis, adhesion, etc. In this study haloalkaliphilic Bacillus sp., known to cope with osmophilic stress, was selected and screened for EPS pro...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2011
Erle Gao Jianshe Liu

So far, no research has been focused on the determination of organomercuries in sewage sludge. Here, an ultrasonic extraction method for the rapid determination of methylmercury (MeHg) and ethylmercury (EtHg) in sewage sludge after ultrasound-assisted extraction is proposed. Using TMA (tetramethylammonium hydroxide) as the extractant with 3.0 g copper powder, ultrasonic extraction for 30 min at...

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