نتایج جستجو برای: zn and cr concentration measured using an icp
تعداد نتایج: 18070899 فیلتر نتایج به سال:
Background: The pollution of the aquatic environment with heavy metals has become a worldwide problem during recent years, due to their potential toxic effects and ability to bio-accumulate in aquatic ecosystems. Heavy metals are sensitive indicators for monitoring changes in the aquatic environment. Methods: In this study, total concentrations of Cr, Pb, Cu, Zn, and Fe were measured in water...
A rapid method for the determination of Pb, Cd, Cu, Cr, Co, Ni, Mn and Zn in honey and sugars without prior digestion or ashing of the sample was developed, using inductively coupled plasma atomic emission spectrometry (ICP-AES). The critical instrumental parameters such as sample flow rate and radio frequency incident power were thoroughly optimized. The effect of matrix type and its concentra...
The main purpose of the study was absorption heavy metals in leaves forest tree species, which were planted two different plots for forestry use and environmental restoration. Four species studied Pinus brutia, Robinia pseudoacaccia, Quercus trojana Fraxinus ornus. Forty-eight leaf samples collected consisted six from each at plot. metal concentrations measured following nine metals: iron (Fe),...
in recent years, there has been a growing interest among researchers to investigate the relationship betweenteacher self-efficacy and classroom behavior management, especially students misbehavior. therefore, this study aimed to comparatively investigate english and arabic teachers’ use of different behavior managementstrategies, their self-efficacy, and their success in an iranian context. th...
The aim of the study was to compare concentrations risk elements (As, Cu, Mn, Ni, Pb, Zn) in alluvial soil, which were measured by a portable X-ray fluorescence analyser (pXRF) situ (FIELD) and laboratory (LABORATORY). Subsequently, regression equations developed for individual through method construction model, results pXRF with classical analysis (ICP-OES). accuracy measurement, expressed coe...
abstract the aim of the present study is to explore the impact of the cognitive reading strategy instruction on learners reading self-efficacy and their reading achievement. in order to fulfill this purpose, from 120 participants, 90 intermediate efl learners as an experimental group were chosen from three different educational settings namely, yazd university, yazd science and art un...
Road dust is an important source of resuspended particulate matter (PM) but information lacking on the chemical composition ultrafine particle fraction (UFP; <0.1 µm). This study investigated metal concentrations in UFP isolated from “dust box” sweepings collected by City Toronto, Canada, using regenerative-air-street sweepers. Dust box samples expressway, arterial and local roads were aeros...
as polysemy is encountered frequently in english as foreign language. fl learners’ ability to disambiguate polysemous verbs becomes critical to their comprehension in the target language. this thesis, accordingly, investigated how iranian efl learners achieved comprehension of english polysemous verbs by using three different types of cues: (1) elaborated context, (2) semantic frames, and (...
A novel on-line oxidation method of ultra-trace Cr(III) dissolved in natural water has been developed using a flow electrolysis cell. This method was successfully applied to the determination of the total Cr concentration by flow injection-solid phase spectrophotometry using diphenylcarbazide as a coloring agent. With the applied potential of 1.35 V (vs. Ag/AgCl) and the flow rate of 0.80 cm(3)...
the effects of industrial textile water(effluent water,ew) on soil, water and plant was investigated in this research. for conducting this research major important textile factory were selected and sampling was done in 2 stages and in 2 years. in each district and the control field (soil not irrigation with effluent water) the soils from 0-30 cm depth and plants were sampled in three replicates...
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