نتایج جستجو برای: Atomic absorption spectroscopy

تعداد نتایج: 358454  

Journal: :physical chemistry and electrochemistry 0
masoomeh emadi young researchers and elite club, marvdasht branch, islamic azad university, marvdasht, iran mohammad alizare zare 1young researchers and elite club, marvdasht branch, islamic azad university, marvdasht, iran omran moradlou 2department of chemistry, college of sciences, alzahra university, tehran, iran maryam iranpour department of science and research branch, islamic azad university, fars, iran

a new and simple method followed by atomic absorption spectrometry has been developedfor indirect determination of ascorbic acid (aa). the proposed method was based on the oxidationof aa to dehydroascorbic acid with cu2+cation(200mgl-1)in an ammonium thiocyanatesolution atph2.4. aa reduces cu2+to cu+followed by the precipitation of cu+ with scn-. then, the excess ofcu2+in the solution was measu...

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. ...

Journal: :caspian journal of environmental sciences 2013
m. m. rahbar hashemi m. ashournia m. a. rahimipour h. modaberi

anzali international wetland is one of the most valuable water resources as registered in ramsar convention with an extent of about 150 km2 in the south caspian sea. this wetland, not only has ecological and biological importance for migratory birds and rare fish species, but also is used for farms to discharge into the caspian sea through this wetland. therefore its pollution control is very i...

Journal: :journal of agricultural science and technology 2013
j. y. zhang y. l. zhao y. z. wang j. zhang t. j. yuan

distribution and mobility of nine mineral elements (k, ca, na, mg, fe, zn, cu, se, and cr) in cultured gentiana rigescens and its root zone soil were determined by atomic absorption spectroscopy. g. rigescens materials were planted under tea and white papaya trees in yun county and yongde of lincang area in yunnan province of china. the results showed that g. rigescens and its soil were high in...

Journal: :health scope 0
eisa solgi department of environment, faculty of natural resources and environment, malayer university, malayer, hamedan, ir iran; department of environment, faculty of natural resources and environment, malayer university, malayer, hamedan, ir iran. tel: +98-8133339841, fax: +98-8133339844 hadi khodabandelo department of environment, faculty of natural resources and environment, malayer university, malayer, hamedan, ir iran

background soil pollution due to toxic metals released by industrial activities such as cement production is a serious problem from the standpoints of the environment and public health, because they tend to persist, circulating indefinitely and, eventually, accumulating throughout the food chain. objectives this paper presents the results of the first research study into the distribution of cad...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2008
mohammad reza nilforoushan sasan otroj

steel slags are the by products of steel industries, which forms during reduction process of iron melting. the chemical composition of it changes depending to the melting procedure. its mineralogical composition also varies based on the cooling procedure. two different types of steel slag were used as absorbing bed for various concentrations of pb2+ ions in the form of lead chloride, and the co...

Journal: :nutrition and food sciences research 0
haniyeh moallem bandani zabol university of medical sciences, zabol, iran fardeen ali malayeri zabol university of medical sciences, zabol, iran donya arefi zabol university of medical sciences, zabol, iran majid rajabian , payam-e-noor university (pnu), mashhad, iran reza entezari heravi zabol university of medical sciences, zabol, iran laleh rafighdoost zabol university of medical sciences, zabol, iran

background and objectives: heavy metals such as cadmium and lead are the most important toxins spreading through various ways like water, soil, and air in nature and easily enter human food chain. it is essential to determine the cumulative and harmful effects of these metals in nutrients, especially in cow milk because it is a unique source of food for all ages and it contains both essential a...

Maryam Iranpour Masoomeh Emadi, Mohammad AliZare Zare Omran Moradlou

A new and simple method followed by atomic absorption spectrometry has been developedfor indirect determination of ascorbic acid (AA). The proposed method was based on the oxidationof AA to dehydroascorbic acid with Cu2+cation(200mgL-1)in an ammonium thiocyanatesolution atpH2.4. AA reduces Cu2+to Cu+followed by the precipitation of Cu+ with SCN-. Then, the excess ofCu2+in the solution was measu...

2012
Alan Walsh

Atomic absorption spectroscopy Atomic absorption spectroscopy (AAS) was developed in the early 1950’s by Alan Walsh. It works on the principle that certain elements absorb certain wavelengths, and this level of absorption is characteristic of each element. Also, electrons in atoms can only exist in particular energy levels, and when an electron moves to a higher energy level, electromagnetic ra...

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