کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1218159 1494504 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct atomic absorption spectrometry determination of arsenic, cadmium, copper, manganese, lead and zinc in vegetable oil and fat samples with graphite filter furnace atomizer
ترجمه فارسی عنوان
بررسی مستقیم جذب اتمی اتمسفر آرسنیک، کادمیوم، مس، منگنز، سرب و روی در نمونه های روغن نباتی و چربی با اسپری کننده کوره فیلتر گرافیت
کلمات کلیدی
طیف سنجی جذب اتمی الکتروترمال، اسپری فیلتر کوره گرافیت، اصلاح کننده شیمیایی، فلزات سنگین، چربی های سبزیجات، روغن تجزیه و تحلیل مواد غذایی، ایمنی مواد غذایی، ترکیب غذا
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• The parameters of filter-furnace for atomic absorption spectroscopy are presented.
• Using Pd-Mg chemical modifier.
• The background absorption signal was successfully reduced.
• The time of one element determination does not exceed ∼3–5 min.
• Determination trace amounts of heavy metals in some of vegetable oils and fats.

The article presents the results of optimization of operation parameters, investigation of analytical characteristics and the abilities of a graphite filter-furnace (FF) atomizer for the direct electrothermal atomic absorption spectroscopy (ET AAS) determination of trace amounts of Mn, As, Pb, Cu, Cd and Zn in some vegetable oils and fats. The effect of pyrolysis and atomization temperatures of the graphite FF atomizer on atomic absorbance values of the listed elements at their evaporation from some organic solutions in the presence of a Pd-Mg chemical modifier (CM) was investigated. For the ET AAS determination of As, Pb, Cd and Zn with Pd-Mg CM, the temperature of the graphite FF atomizer for the pyrolysis step can be raised by 250–350 °C. This mode allows to eliminate the background absorption, to increase the sensitivity of the elements to be analyzed and to enhance the total content of vegetable oils or fats in organic solutions up to 0.5 g mL−1. The obtained limits of quantification for Mn, As, Pb, Cu, Cd and Zn were 0.002, 0.004, 0.004, 0.002, 0.0008, 0.0004 mg kg−1, respectively. The relative standard deviation (RSD) varied between ∼3 and 8% and the time of one element determination did not exceed ∼3–5 min. The reliability of the proposed method was checked using the reference method. A paired Student's t-test showed no significant difference between the results obtained by both methods on a 95% confidence level.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Food Composition and Analysis - Volume 38, March 2015, Pages 62–68
نویسندگان
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