Determination of Copper-Based Fungicides by Flame Atomic Absorption Spectrometry Using Digestion Procedure with Sulfuric and Nitric Acid

Abstract

Copper-based fungicides can be effectively digested by treatment with a mixture of concentrated sulfuric and nitric acid in exactly 15 minutes for the rapid determination via copper using flame atomic absorption spectrometry (AAS). Under optimum conditions, the results of copper fungicide analysis were consistent to those obtained by the AOAC’s recommended method. Recovery values ranged from 98.63 to 103.40%. Relative standard deviation values are lower than 2%. The proposed digestion procedure applied for determination of copper ranged from 100 to 594 g Cu kg-1 in different commercial fungicide products.

Fungicidi na bazi bakra se uspešno mogu određivati plamenom atomskom apsorpcionom spektrometrijom praćenjem apsorpcije bakra, nakon digestije uzoraka koncentrovanom sumpornom i azotnom kiselinom u toku 15 minuta. Pod optimalnim uslovima, rezultati analize su u saglasnosti sa onima dobijenim zvaničnom AOAC metodom, s tim što su vrednosti prinosa u užem intervalu (98.63 do 103.40%) u odnosu na odgovarajuće vrednosti dobijene AOAC metodom. Vrednosti relativne standardne devijacije su manje od 2%. Predloženi postupak digestije se može primeniti za određivanje uzoraka bakarnih fungicida koji sadrže od 100 do 594 g Cu kg-1.