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Survey of levels of common toxic metals and pesticides residues in some selected organically grown foods of Indian origin

Chawla, Gunjan (2007) Survey of levels of common toxic metals and pesticides residues in some selected organically grown foods of Indian origin. [Student Project Report]

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Abstract

This Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page.

Item Type: Student Project Report
Additional Information: In recent years several organic foods (both certified and uncertified)are available in the market. To know the quality and authenticity, a survey work was undertaken to determine the levels of contaminants such as heavy metals (Pb, Cd, Hg, As) and pesticide residues (organochlorides,organophosphates and pyrethroids) in some of the organic food samples procured from different regions of the country. 11 organic food samples were procured from market for the study and were analysed for the presence of lead,cadmium, mercury ,arsenic and 38 pesticides using AAS and Gas Chromatography techniques respectively. The AAS instrument was calibrated for lead, cadmium, mercury and arsenic standard solutions by recording the absorbance at 3 different concentrations. For the determination of lead and cadmium dry ashing was used where as for arsenic and mercury wet ashing was used as these metals are volatile in nature and may lost at high temperatures used during dry ashing. The absorbance or concentration values for lead and cadmium in all the samples showed negative values indicating that the levels of these metals were below detection limit. Mercury was detected in three of the samples ( Ragi, Milk and Black Tea). However the values obtained were below detection limit of 0.02ppm. In respect of arsenic the values ranged from 0.006 to 0.117ppm. 38 pesticides were investigated including 21 Organochlorides, 8 Pyrethroides and 9 Organophosphates. The GC instrument was calibrated using these standards and their retention time was taken for identification and quantification. ECD was used for Organochlorides and Pyrethroides and FPD was used for Organophosphates. Results obtained showed that the products analysed could be considered as deemed to be organically grown.
Uncontrolled Keywords: metallic contaminants toxic metals pesticides residues organic foods
Subjects: 600 Technology > 08 Food technology > 12 Allergy & Toxicology
600 Technology > 08 Food technology
Divisions: Food Safety Analytical Quality Control Lab
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 10 Aug 2007 11:42
Last Modified: 28 Dec 2011 09:30
URI: http://ir.cftri.com/id/eprint/1398

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