Spectrophotometric method for determination of phosphine residues in coffee seeds.

Rangaswamy, J. R. (1990) Spectrophotometric method for determination of phosphine residues in coffee seeds. Journal of Food Science and Technology (India), 27 (1). pp. 33-37. ISSN 0022-1155

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Abstract

A method for determination of phosphine (PH) residues on/in coffee seeds has been developed based on the reaction of phosphine with silver nitrate in 2% aqueous methanol. The linear relationship between absorbance of egg yellow chromophore and concentration of PH, is obeyed between 0.025 and 0.2 µg PH, in 3 ml solvent. PH, residue in fumigated coffee seeds, is determined by soaking lOg sample in 15 to 30 ml solvent for one hr and the absorbance at 410 nm of the filtrate is read against the crop control blank of the same sample size. The method is sensitive with lower detectable and estimatable limits of 0.01 and 0.025 µ,g PH, respectively. Recovery of added PH, from a closed system is 95%.

Item Type:	Article
Subjects:	600 Technology > 07 Beverage Technology > 04 Coffee 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 26 Pesticide Chemistry
Divisions:	Food Protectants and Infestation Control
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	20 Dec 2006
Last Modified:	30 Dec 2016 11:30
URI:	http://ir.cftri.res.in/id/eprint/354

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