Determination of lead and cadmium in tap water and apple leaves after preconcentration on a new acetylacetone bonded polyurethane foam sorbent

Determination of cobalt and manganese in food seasonings by flame atomic absorption spectrometry after preconcentration with 2-hydroxyacetophenone-functionalized polyurethane foam

“…The support is possibly provided by electrostatic interactions between the terminal toluidine of the foam and the chelating reagent. The second method involves a modification of the foam through reactions typical of amines, with subsequent coupling of the reagent (Burham et al, 2008;Lemos et al, 2007). In polyurethane foams, functionalization reactions can occur by reaction between the amino group of the foam and nitrosonium cations; this reaction is called diazotization (Burham et al, 2006).…”

In situ emulsification microextraction using a dicationic ionic liquid followed by magnetic assisted physisorption for determination of lead prior to micro-sampling flame atomic absorption spectrometry

“…The maximum permitted values of lead in drinking water have been set at 15 µg L -1 , by the United States Environmental Protection Agency (EPA) [2], while the European Union (EU) has established limits of 10 µg L -1 [3]. The bibliography mentions a wide variety of levels for lead in potable waters: 0.07-15.8 µg L -1 [4][5][6]. Since even trace levels of lead highly affect the human life and the environment, its accurate and precise determination is of vital importance and problematic for analytical chemists.…”

Preconcentration of Lead in Sugar Samples by Solid Phase Extraction and Its Determination by Flame Atomic Absorption Spectrometry

“…Besides having the appropriate chelating properties to bond, dithizone has proved to be highly selective towards lead. It also offers high capacity and sensitivity [13,14] and is used for modification of sorbent in this work.…”

“…It offers advantages such as short extraction time, low cost, high enrichment factors and recoveries and low consumption of non environment-friendly solvents. SPE can easily be used in tandem with FAAS without much trouble and is generally considered to be a simple method [2,[11][12][13][14][15][16].…”