نتایج جستجو برای: bi concentrations were determained using icp

تعداد نتایج: 5772075  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان - دانشکده علوم انسانی 1391

the present study sought to investigate the impact of using mind-mapping technique instruction on female elementary efl learners reading comprehension; it also investigated their attitudes towards using mind-mapping technique as a tool to improve their reading comprehension. this study followed a quasi-experimental design with two intact groups as experimental, and control groups. the participa...

Journal: :Analytica chimica acta 2008
D Dick A Wegner P Gabrielli U Ruth C Barbante M Kriews

Inductively coupled plasma mass spectrometry (ICP-MS) is a suitable tool for multi-element analysis at low concentration levels. Rare earth element (REE) determinations in standard reference materials and small volumes of molten ice core samples from Antarctica have been performed with an ICP-time of flight-MS (ICP-TOF-MS) system. Recovery rates for REE in e.g. SPS-SW1 amounted to approximately...

Journal: :Environmental pollution 2016
James Kearns Andrew Turner

Bismuth is a heavy metal whose biogeochemical behaviour in the marine environment is poorly defined. In this study, we exposed three different species of macroalga (the chlorophyte, Ulva lactuca, the phaeophyte, Fucus vesiculosus, and the rhodophyte, Chondrus crispus) to different concentrations of Bi (up to 50 μg L(-1)) under controlled, laboratory conditions. After a period of 48-h, the phyto...

2015
F. M. Mtunzi S. J. Moja

In this study, inductive coupled plasma-optical emission spectroscopy (ICP-OES) is employed for the evaluation of soil pollution for selected metals in the Vanderbijlpark area of South Africa. Soil samples investigated were collected from five different sites in the city based on their proximity to the industrial areas of Vanderbijlpark. Soil samples were collected from close to traffic robots,...

2013
D. A. Dixon P. A. Mayewski E. Korotkikh S. B. Sneed M. J. Handley D. S. Introne T. A. Scambos

This study provides a baseline from which changes in the chemistry of the atmosphere over Antarctica can be monitored under expected warming scenarios and continued intensification of industrial activities in the Southern Hemisphere. It is the first study to measure more than 25 chemical constituents in the surface snow and firn across extensive regions of Antarctica. We present major ion, trac...

2003
MARC NORMAN PHILIP ROBINSON DARRYL CLARK

International reference materials representing a diverse suite of sulfide ores and related lithologies have been analyzed for major and trace element concentrations by XRF, solution ICP–MS, and laser-ablation ICP–MS (LA–ICP–MS) after fusion of the sample to a lithium borate glass. Reference materials analyzed for this study include a wide variety of bulk compositions, including ores of Pb–Zn su...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2005
Shinichi Suzuki Yasuhiro Suzuki Hikoto Ohta Masaaki Kasamatsu Toshio Nakanishi

Thirteen arsenous acid samples of known origins and refining methods were collected. Each sample was subjected to quantitative analysis of any impurity elements present using synchrotron radiation X-ray fluorescence spectrometry (SR-XRF) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). The trace elements selected were Sn, Sb and Bi for the reasons that they were considered...

2014
Chiara Uglietti Paolo Gabrielli John W. Olesik Anthony Lutton Lonnie G. Thompson

We quantified leaching and mass fractions of trace elements in melted acidified ice core samples measured by Inductively Coupled Plasma Sector Field Mass Spectrometry (ICP-SFMS). This assessment was conducted using nine ice core sections retrieved from various high-altitude drilling sites in South America, Africa, Asia and Europe. Twenty trace elements (Ag, Al, As, Bi, Cd, Co, Cr, Cu, Fe, Mn, M...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1392

abstract although music possesses some kind of power and using it has been welcome by many students in language classrooms, it seems that they take a non-serious image of the lesson while listening to songs and they may think that it is a matter of fun. the main objective of the present study was to investigate whether learning a foreign language through musical texts (songs) can have an impac...

Journal: :محیط زیست طبیعی 0
مریم زارع دانشجوی کارشناسی ارشد، گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران امیرحسین حمیدیان استادیار گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران هادی پورباقر استادیار گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، ایران سهراب اشرفی استادیار گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران لیلا وزیری دانشجوی کارشناسی، گروه محیط زیست، دانشکده منابع طبیعی دانشگاه تهران، ایران

industrial activities lead to an increase in heavy metal burden in rivers. sediment and algae (spirogyra sp.) samples were collected from the shoor river to investigate their heavy metal concentrations. dry and ashed samples of algae and sediment were digested using concentrated nitric acid. heavy metals (as, fe, zn and cr) concentration measured using an icp-oes instrument (perkinelmer, usa). ...

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