scholarly journals Effect of Ultrasound Agitation on the Release of Heavy Elements in Certified Reference Material of Human Hair (CRM BCR 397)

2006 ◽  
Vol 89 (5) ◽  
pp. 1410-1416 ◽  
Author(s):  
Tasneem G Kazi ◽  
Hassan I Afridi ◽  
Mohammad K Jamall ◽  
Gul H Kazi ◽  
Mohammad B Arain ◽  
...  
Keyword(s):  
Reference Material ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Human Hair ◽  
Scalp Hair ◽  
Absorption Spectrometry ◽  
Heavy Elements ◽  
Acid Digestion ◽  
Digestion Method ◽  
Hair Samples

Abstract An ultrasonic-assisted leaching procedure was developed for the determination of heavy elements (As, Cu, Cd, Pb, and Zn) in Certified Reference Material of human hair (CRM 397) provided from the Community Bureau of Reference (BCR) of the Commission of the European Community. Concentrated nitric acid30% hydrogen peroxide (2 + 1) was used for the leaching method. The effects of different factors on acid leaching of elements, such as presonication time (without ultrasonic stirring), sonication or exposure time to ultrasound, and temperature of the ultrasonic bath have been investigated. Optimum values of these parameters were selected for the maximum extraction of heavy metals from CRM BCR 397 and human scalp hair samples of normal healthy males. To check the validity of the proposed method, a wet acid digestion method was used to obtain the total elemental concentration in CRM BCR 397 and scalp hair samples. Cu and Zn in leachate and digests were measured by flame atomic absorption spectrometry using a conventional air/acetylene flame, while As, Cd, and Pd were determined by electrothermal atomic absorption spectrometry. Under optimized conditions, the recovery for Zn, Cd, Pd, As, and Cu was 98, 98.5, 97.5, 98.2, and 95%, respectively, of those obtained with the wet acid digestion method.

Evaluation of arsenic, cobalt, copper and manganese in biological Samples of Steel mill workers by electrothermal atomic absorption Spectrometry

2009 ◽  
Vol 25 (1) ◽  
pp. 59-69 ◽  
Author(s):  
HI Afridi ◽  
TG Kazi ◽  
NG Kazi ◽  
MK Jamali ◽  
MB Arain ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Biological Samples ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Human Beings ◽  
Acid Digestion ◽  
Steel Mill ◽  
Hair Samples

The determination of trace and toxic elements in biological samples (blood, urine and scalp hair samples) of human beings is an important clinical test. The aim of our present study was to determine the concentration of arsenic (As), copper (Cu), cobalt (Co) and manganese (Mn), in biological samples of male production workers (PW) and quality control workers (QW) of steel mill, with aged 25–55 years, to assess the possible influence of environmental exposure. For comparison purpose, the same biological samples of unexposed healthy males of same age group were collected as control subjects. The determination of all elements in biological samples was carried out by electrothermal atomic absorption spectrometry, prior to microwave assisted acid digestion. The accuracy of the As, Cu, Co and Mn measurements was tested by simultaneously analyzing certified reference materials (CRMs) and for comparative purposes conventional wet acid digestion method was used on the same CRMs. No significant differences were observed between the analytical results and the certified values, using both methods (paired t-test at P > 0.05). The results indicate that concentrations of As, Cu, Co and Mn in all three biological samples of the exposed workers (QW and PW) were significantly higher than those of the controls. The possible correlation of these elements with the etiology of different physiological disorders is discussed. The results were also demonstrated the need of attention for improvements in workplace, ventilation and industrial hygiene practices.

Evaluation of toxic metals in biological samples (scalp hair, blood and urine) of steel mill workers by electrothermal atomic absorption spectrometry

2006 ◽  
Vol 22 (9) ◽  
pp. 381-393 ◽  
Author(s):  
Hassan I Afridi ◽  
Tasneem G Kazi ◽  
Mohammad K Jamali ◽  
Gul H Kazi ◽  
Mohammad B Arain ◽  
...  
Keyword(s):  
Quality Control ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Toxic Metals ◽  
Biological Samples ◽  
Scalp Hair ◽  
Absorption Spectrometry ◽  
Human Beings ◽  
Steel Mill ◽  
Hair Samples

The determination of toxic metals in the biological samples of human beings is an important clinical screening procedure. This study aimed to assess the possible influence of environmental exposure on production workers (PW) and quality control workers (QCW) of a steel mill, all male subjects aged 25-55 years. In this investigation, the concentrations of Pb, Cd, Ni and Cr were determined in biological samples (blood, urine and scalp hair samples) from these steel mill workers in relation to controlled unexposed healthy subjects of the same age group. After pre-treatment with nitric acid-hydrogen peroxide, the samples were digested via a microwave oven, and for comparison purposes, the same samples were digested by the conventional wet acid digestion method. The samples digested were subjected to graphite furnace atomic absorption spectrometry (GFAAS). To assess the reliability of these methods, critical factors, such as detection limit(s), calibration range(s), accuracy and precision, were studied. Quality control for these procedures was established with certified sample of human hair, urine and whole blood. The results indicate that the level of lead, cadmium and nickel in scalp hair, blood and urine samples were significantly higher in both groups of exposed workers (QW and PW) than those of the controls. The possible connection of these elements with the etiology of disease is discussed. The results also show the need for immediate improvements in workplace ventilation and industrial hygiene practices. Toxicology and Industrial Health 2006; 22: 381-393.

scholarly journals IDENTIFICAÇÃO E AVALIAÇÃO DOS TEORES DE METAIS TÓXICOS EM BATONS

2018 ◽  
Vol 10 (Especial) ◽  
pp. 43-47
Author(s):  
Bruna Rosângela Ribeiro Gonçalves ◽  
Larissa de Jesus Rodrigues ◽  
Daniel Ângelo Macena ◽  
Maíra Rodrigues Uliana ◽  
Vinícius Marques Gomes
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Product Quality ◽  
Atomic Absorption ◽  
Toxic Metals ◽  
Absorption Spectrometry ◽  
Improve Product Quality ◽  
Consumer Health ◽  
Acid Digestion ◽  
Potentially Toxic Metals ◽  
Digestion Method

More and more demanding consumers have made cosmetic companies invest in products and research aiming at improve product quality and enhance consumer health and sustainability. Some metals are essential for the good development of beings, but there are others that are harmful to health. Of all metals only 30 are toxic, and lead, cadmium and chromium belong to this group. These metals are present in the pigments used in the manufacture of lipsticks. The legislation establishes safety limits for the presence of these metals in cosmetics, since the risk of contamination is linked to their concentration and exposure. For this reason the analysis of potentially toxic metals in lipsticks is necessary, quantifying and comparing to the contents presented not only by the companies, but also by the current legislation. Thus, this study aimed to quantify the levels of lead, cadmium and chromium in lipsticks of different brands, using acid digestion method and determination by atomic absorption spectrometry. From the results, it was possible to observe the presence of high levels of cadmium in all the analyzed brands and the highest concentrations were found in the darker shades.

Biomonitorization of chromium, copper, iron, manganese and nickel in scalp hair from orthodontic patients by atomic absorption spectrometry

2014 ◽  
Vol 37 (2) ◽  
pp. 759-771 ◽  
Author(s):  
Ana Martín-Cameán ◽  
Isabel Molina-Villalba ◽  
Angeles Jos ◽  
Alejandro Iglesias-Linares ◽  
Enrique Solano ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Scalp Hair ◽  
Absorption Spectrometry ◽  
Orthodontic Patients ◽  
Iron Manganese

scholarly journals Determination of Platinum in Wine by Graphite Furnace Atomic Absorption Spectrometry

1997 ◽  
Vol 80 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Carmen Cabrera-Vique ◽  
Pierra-Louis Teissedre ◽  
Marie-Thérèse Cabanis ◽  
Jean-Claude Cabanis
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Graphite Furnace ◽  
Standard Addition ◽  
Absorption Spectrometry ◽  
Acid Digestion ◽  
White Wines ◽  
Relative Standard ◽  
Graphite Furnace Atomic Absorption

Abstract A method based on graphite furnace atomic absorption spectrometry (GFAAS) was developed for determining platinum in wine. Wine samples were prepared by microwave acid digestion or dry mineralization. The method of standard addition was used for Pt determination in untreated wine samples and mineralized samples. Analyte modifiers and furnace conditions were optimized. Effects of cations (Mg2+, Ca2+, K+, Na+, and NH|) and anions (PO43, SO42) were tested separately and in combination. Analytical characteristics of the method were optimized for analyte recovery and signal enhancement. Recoveries ranged from 92.5 to 102%, and precision reproducibility relative standard deviation varied from 7.5 to 10%. Red, rosé, and white wines from France were analyzed. Platinum levels found in most wines were very low (<10 μg/L).

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