Determination of Some Trace Elements in Food and Soil Samples by Atomic Absorption Spectrometry After Coprecipitation with Holmium Hydroxide

2012 ◽  
Vol 95 (3) ◽  
pp. 892-896 ◽  
Author(s):  
Sibel Saracoglu ◽  
Mustafa Soylak ◽  
Dilek Çabuk ◽  
Zeynep Topalak ◽  
Yasemin Karagozlu
Keyword(s):  
Trace Elements ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Certified Reference Materials ◽  
Absorption Spectrometry ◽  
Sample Volume ◽  
Soil Samples ◽  
Separation And Preconcentration ◽  
Loam Soil

Abstract The determination of trace elements in food and soil samples by atomic absorption spectrometry was investigated. A coprecipitation procedure with holmium hydroxide was used for separation- preconcentration of trace elements. Trace amounts of copper(II), manganese(II), cobalt(II), nickel(II), chromium(III), iron(III), cadmium(II), and lead(II) ions were coprecipitated with holmium hydroxide in 2.0 M NaOH medium. The optimum conditions for the coprecipitation process were investigated for several commonly tested experimental parameters, such as amount of coprecipitant, effect of standing time, centrifugation rate and time, and sample volume. The precision, based on replicate analysis, was lower than 10% for the analytes. In order to verify the accuracy of the method, the certified reference materials BCR 141 R calcareous loam soil and CRM 025-050 soil were analyzed. The procedure was successfully applied for separation and preconcentration of the investigated ions in various food and soil samples. An amount of the solid samples was decomposed with 15 mL concentrated hydrochloric acid–concentrated nitric acid (3 + 1). The preconcentration procedure was then applied to the final solutions. The concentration of trace elements in samples was determined by atomic absorption spectrometry.

Online Preconcentration System Using 6-(2-Thienyl)-2-Pyridine Carboxaldehyde Functionalized Amberlite XAD-4 Resin for the Determination of Trace Elements in Waters by Flame Atomic Absorption Spectrometry

2013 ◽  
Vol 96 (3) ◽  
pp. 642-649 ◽  
Author(s):  
Cennet Karadaş ◽  
Derya Kara
Keyword(s):  
Trace Elements ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Water Samples ◽  
Certified Reference Materials ◽  
Absorption Spectrometry ◽  
Rice Flour ◽  
Flame Atomic Absorption

Abstract An online flow injection method was developed for the determination of trace elements in waters using 6-(2-thienyl)-2-pyridinecarboxaldehyde functionalized Amberlite XAD-4 resin. The metals were eluted with 1.0 M HNO3 directly to a flame atomic absorption spectrometry determination system. The sorption capacities of the resin for metal ions were 74.6, 113.7, 48.3, 131.6, and 88.6 μmol/g for Cd(II), Ni(II), Pb(II), Co(II), and Cu(II), respectively. The resin was found to be very stable and capable of being used for more than 250 retention and elution cycles without major loss of performance. Detection limits (3SD) were determined to be 0.14 μg/L for Cd, 0.39 μg/L for Cu, 0.82 μg/L for Ni, 0.88 μg/L for Co, and 2.54 μg/L for Pb using 10 mL sample loading. The accuracy of the proposed method was checked using different certified reference materials [estuarine water (SLEW-3), riverine water (SRLS-5), 19-element aqueous standard (QCS-19), wheat flour (NBS 1567 a), and rice flour unpolished high level Cd (NIES 10c)]. Results were in agreement with certified values. The proposed method was applied to the determination of Cu, Ni, Co, Cd, and Pb in natural water samples. The recovery values for spiked water samples were between 91.9 and 107.4%.

scholarly journals Determination of Trace Amounts of Pd(II) Ions in Water and Road Dust Samples by Flame Atomic Absorption Spectrometry After Preconcentration on Modified Organo Nanoclay

2010 ◽  
Vol 93 (6) ◽  
pp. 1952-1956 ◽  
Author(s):  
Daryoush Afzali ◽  
Ali Mostafavi ◽  
Zahra Afzali
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Road Dust ◽  
Absorption Spectrometry ◽  
Sample Volume ◽  
Solid Sorbent ◽  
Flame Atomic Absorption ◽  
Separation And Preconcentration

Abstract This paper describes the application of organo nanoclay, an easily prepared and stable solid sorbent, to the preconcentration of trace amounts of palladium ions in aqueous solution. The organo nanoclay was prepared by adding tetradecyldimethylbenzylamonium chloride onto montmorillonite, which was then modified with 1-(2-pyridylazo)-2-naphthol. The modified nanoclay was used as a solid sorbent for separation and preconcentration of trace amounts of Pd(II) ions, and a simple, sensitive, and economical method was developed for determination of trace amounts of palladium by flame atomic absorption spectrometry. The sorption of Pd(II) ions was quantitative in the pH range of 1.55.0, whereas quantitative desorption occurred with 5.0 mL of a mixture containing 1.0 M thiourea and 1.0 M HCl. The RSD of the method was 2.1 (n = 10; concn = 0.5 g/mL), and the LOD (3bl; = SD and bl = blank) was 0.1 ng/mL. The calibration curve was linear for concentrations of 0.58.0 g/mL in the initial solution, and the preconcentration factor was 140. The maximum capacity of the sorbent was 2.4 mg Pd(II)/g modified organo nanoclay. The influences of the experimental parameters, including sample pH, eluant volume, eluant type, sample volume, and interfering ions, on the recoveries of the palladium ion were investigated. The proposed method was applied to the preconcentration and determination of palladium in different samples.

scholarly journals Determination of Chromium in Biological Material by Electrothermal Atomic Absorption Spectrometry Method

2012 ◽  
Vol 56 (4) ◽  
pp. 585-589 ◽  
Author(s):  
Agnieszka Nawrocka ◽  
Józef Szkoda
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Certified Reference Materials ◽  
Graphite Furnace ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Magnesium Nitrate ◽  
Spectrometry Method ◽  
Total Chromium

Abstract Procedure for determination of chromium in biological materials by Zeeman graphite furnace atomic absorption spectrometry method using a Perkin-Elmer spectrometer equipped with hollow-cathode lamp at 357.9 nm was developed. The samples of animal tissues, food, and feed were digested in muffle furnace at 450ºC. The ash was dissolved in 1 N hydrochloric acid and the final solution was diluted in 0.2% nitric acid. Magnesium nitrate (1%) was used as a matrix modifier. The method was validated in terms of basic analytical parameters. The mean recoveries of chromium was 84.4% for muscle, 79.0% for canned meat, and 80.2% for feed, and analytical detection limit was 0.003 μg/g. Certified reference materials were used for analytical quality assurance. The proposed analytical procedure is well adapted for monitoring chromium content in food and feedstuffs. Content of total chromium in the tested samples (animal muscles and liver) was low and was situated in the range of 0.031-0.101 mg/kg (muscles) and 0.047-0.052 mg/kg (liver).

scholarly journals Atomic absorption spectrometry in wine analysis

2009 ◽  
Vol 28 (1) ◽  
pp. 17 ◽  
Author(s):  
Trajče Stafilov ◽  
Irina Karadjova
Keyword(s):  
Trace Elements ◽  
Atomic Absorption Spectrometry ◽  
Trace Element ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Analytical Control ◽  
Allowable Limit ◽  
Wine Production ◽  
Element Determination ◽  
Separation And Preconcentration

This article reviews methods for the determination and identification of trace elements in wine by using atomic absorption spectrometry (AAS). Wine is one of the most widely consumed beverages and strict analytical control of trace elements content is required during the whole process of wine production from grape to the final product. Levels of trace elements in wine are important from both points of view: organoleptic – Fe, Cu, Mn and Zn concentrations are directly related to the destabilization and oxidative evolution of wines, and toxicological – toxic elements content should be under the allowable limit, wine identification. The identification of metals in wine is subject of increasing interest since complexation may reduce their toxicity and bioavailability. AAS is one of widely used methods for routine analytical control of wine quality recommended by the International Organization of Vine and Wine. Two main approaches – preliminary sample digestion and direct instrumental measurement combined with AAS for trace element determination in wines are reviewed and discussed. Procedures for various sample pretreatments, for trace element separation and preconcentration are presented. Advances in metal identification studies in wines based on AAS are presented.

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