These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Confirming heptachlor and heptachlor epoxide in food samples by gas-liquid chromatography of their photoderivates.
    Author: Ward PM.
    Journal: J Assoc Off Anal Chem; 1977 May; 60(3):673-8. PubMed ID: 858704.
    Abstract:
    The food sample extract is cleaned up on a Florisil column and the 6% ethyl ether in petroleum ether cluate is subjected to repeated concentrations, using a micro-Snyder column, to expel volatile materials that absorb ultraviolet (UV) light. The sample and standard solutions of heptachlor and heptachlor epoxide are placed in quartz cells and exposed to UV radiation in the dark. Characteristic photoderivatives of the respective pesticides which form in the sample extract are identified and measured by comparison with those formed in the irradiated standard solutions, using electron capture gas-liquid chromatography. Recoveries of the 2 pesticides from 13 products, fortified at levels from 0.01 to 0.3 ppm and determined after derivatization, ranged from 67 to 110%.
    [Abstract] [Full Text] [Related] [New Search]