Silver nanoparticle-cellulose composite for thin-film microextraction of Cd and Pb as dithiocarbamate derivatives followed by inductively-coupled plasma mass spectrometry determination

Preconcentration of Cd and Pb at ultratrace level in waters following filtration through silver nanoparticles-cellulose composites used for thin-film microextraction was performed. The new procedure based on the formation pyrrolidine dithiocarbamate (APDC) derivatives, which showed a large affinity toward AgNPs. For this purpose, cellulose filters modified with AgNPs were prepared situ upon reduction ions by sodium tetrahydroborate. effect several experimental parameters such as kind derivatization agent its concentration, sample pH, desorption conditions volume filtered assessed. quantitated eluates inductively coupled plasma-mass spectrometry (ICP-MS). Filters characterized scanning electron microscopy (SEM) backscattering mode combined energy dispersive X-ray spectrometry, showing presence Ag S filter. repeatability expressed relative standard deviation (RSD,%) 1.4% 5.8% Pb. Methodological detection limits 0.6 8.5 ng/L Pb, respectively. method applied to environmental waters.