Rapid determination of some trace metals in several oils and fats
DOI:
https://doi.org/10.3989/gya.2004.v55.i2.162Keywords:
Centrifugation, Improved acid-extraction, Trace metals, Ultrasonic intensification, Vegetable oilsAbstract
An atomic absorption spectrophotometric method has been devised for the rapid determination of trace metals, found in several vegetable oils and fats. Samples were prepared using an ultrasonically assisted acid-extractive technique. The parameters of the analysis were optimized to improve the recovery of metals from the oil matrixes at an ultra trace level within the least possible time. The use of ultrasonic intensification, followed by centrifugation for phase separation reduced the conventional acid extraction time from 180 to only 10 minutes. The respective range of recovery of iron, copper, nickel and zinc was found to be 94.6-98.0 %, 93.6-100.4 %, 95.0-97.3 % and 96.0-101.2 % in a soybean oil which was fortified with 0.10, 0.25, 0.50, 0.75, 1.00 μg/gm of each of the metals using the standard addition method. The ranges of recovery of these metals as investigated by the proposed method were also found in close agreement with those of the wet digestion method. Most of the samples of commercial oils and fats were found to be contaminated with notable amounts of iron and nickel ranging from 0.13-2.48 and 0.027-2.38 ppm respectively. The contents of copper and zinc were also high in many brands, ranging from 0.01-0.15 ppm and zinc 0.03- 0.21 ppm respectively, which poses a threat to oil quality and to human health.
Downloads
Download data is not yet available.
Downloads
Published
2004-06-30
How to Cite
1.
Anwar F, Kazi TG, Saleem R, Bhanger MI. Rapid determination of some trace metals in several oils and fats. Grasas aceites [Internet]. 2004Jun.30 [cited 2024Jul.22];55(2):160-8. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/162
Issue
Section
Research
License
Copyright (c) 2004 Consejo Superior de Investigaciones Científicas (CSIC)
This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the printed and online versions of this Journal are the property of Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.All contents of this electronic edition, except where otherwise noted, are distributed under a “Creative Commons Attribution 4.0 International” (CC BY 4.0) License. You may read here the basic information and the legal text of the license. The indication of the CC BY 4.0 License must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the published by the Editor, is not allowed.