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Register a new userStudy the Effect of Some Factors on the Determination of Mercury by Cold Vapor Technique (CV-AAS)
دراسة تأثير بعض العوامل على تحديد عنصر الزئبق باستخدام تقانة البخار البارد (CV-AAS)
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Tishreen University مقالة
Publication date
2024
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
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تم في هذا البحث دراسة الشروط المثلى لبعض العوامل المؤثرة اثناء عملية تحديد تراكيز عنصر الزئبق باستخدام طريقة الامتصاص الذري بتقنية البخار البارد (Cold Vapor – Atomic Absorption Spectrometry)، حيث شملت هذه العوامل على: زمن سحب العينات أو زمن التأخير (Delay Time)، تركيز المادة المرجعة (Reductant) وخطية المنحني العياري (Linearity Of Calibration Curve). تم دراسة زمن التأخير ضمن المجال (30 – 60S)، فيما درست تراكيز المادة المرجعة ضمن المجال (1 – 12 % w/v)، أما بالنسبة لخطية المنحني العياري فقد قيست الامتصاصية الذرية ضمن مجال التراكيز لعنصر الزئبق (5 – 100 µg/L).
In this research, the optimal conditions for some factors affecting the determination of mercury concentrations by Cold Vapor Atomic Absorption Spectrometry method were studied. These factors included: delay time, in addition to both: Reductant concentration and Linearity of Calibration Curve.The delay time was studied within the range (30 -60 S), while the concentrations of the reductant were studied within the range (1–12 % w/v), As for the linearity of the calibration curve, the atomic absorbance wasmeasured within the range of mercury concentrations (5 -100 μg/L)
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This research was to study the transition of tin to fruit cans, and its
adverse effects to food and human health.
Lead levels were determined in 52 baby food samples dedicated to feeding
children from birth until the age of 12 months. These samples were consisting
of dried cow's milk, rice, wheat, cereal, fruits in addition to samples of human
milk. Samples w
ere exposed to welt digestions and lead level was determined
using graphite furnace atomic absorption spectrophotometer, and results were
compared with the certified reference samples. Results indicated that that
different levels of leads were determined in the samples studied and it was in
the lowest concentration (5.72 μg/kg diet) in canned fruits and in the highest
concentration (121.35 μg/kg) in cereal samples ranged. Other interface levels of
leads were found in the other baby food and reached 20.41μg/L in human milk,
84.32 μg/kg of cow´s milk provided from for 0 to 6 months of age, 98.15 μg/kg
of cow´s milk provided at age 6 to 12 months, and 92.62, 99.94 μg/kg in
formulas containing rice and wheat, respectively. While formulas based on
cereal had the biggest.
This study was conducted to determine some heavy minerals in different types of
canned meat sold in the domestic market. Most of those cans were imported and processed
in different countries and they have different brands. The chosen samples after
ashing were
prepared by using concentrated extra pure Nitric and Hydrochloric acids .The ratios of the
minerals )pb , Cd , Ni , Zn , Cu , Mn , Fe ( were determined by Atomic Absorption
Spectrophotometry , and the content was expressed as (p.p.m) wet weight. It was observed
that the levels of Lead, Iron, and Cadimum, in all different samples were higher than the
permitted limlts according to the Syrian Standards . The Cu level in both , tuna and sardine
was within the permitted limits, but it was higher in the chicken Lunchoen. The level of
Zinc was within the permitted limits according to the Syrian standards. The highest ratio of
Lead was observed in the sardine imported from Morocco which was 8.765 p.p.m and in
the Lunchoen processed in Syria which was 5.18 p.p.m ,and both ratios are much higher
than the permitted limits according to the Syrian Standards.
In this study, the concentration of Pb and Cd was determined in some agricultural
products in order to compare this concentration and to know the capacity of these products
to accumulate these two elements. The samples were digested by nitric acid
and the
elements were determined by the atomic absorption spectroscopy. The results showed that
the concentration of lead and cadmium in protected products was less than the
concentration in unprotected products, and the concentration of lead was more than the
cadmium, these results can be explained by the extensive use of lead and the unprotected
agriculture products were exposed to the air pollution more than the protected products.
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