engleski

Study of matrix effects of functionalized zero- valent iron nanoparticles on ICP-OES emission lines

Analytical performances of inductively plasma optical emission spectrometry (ICP-OES) are characterized by sensitive simultaneous measurements of numerous elements at different emission lines of the particular element. Interference effects in direct measurements of sample solutions depend on spectra complexity which is usually caused by complex matrix of solutions.[1] Recently, exploiting of nanomaterials in analytical sample preparation and procedures is often studied. The majority of works are focused to utilize synthesized or commercially available nanomaterials in extraction procedures. [2] Zero-valent iron nanoparticles (nZVI) are of great potential in removing of specific hazardous substances such as heavy metals and polychlorinated hydrocarbons form water solutions. [3] Their properties to adsorb metals of interest were often improved by suitable coatings on particle surface. However, studies which concern effects on measuring signals of extracted metals are mostly denoted to efficiency of their removal from solutions, and not to effects of coexisted iron released from nanoparticles.[2] In this work we used synthesis according to Zhang and Wang procedure for the preparation of nZVI particles, along with subsequent functionalization by dipicolinic acid.[4] Matrix effects of prepared solutions in inductively coupled plasma-optical emission spectrometry (ICP-OES) were studied using multielemental spectral solution which consists of Al. Ag, Ba, Ca, Cd, Cr, Co, Cu, Mg, Mn, Ni, Pb, V, Sr, and Zn. Intensities of chosen spectral lines were observed at different RF power (1.1 -1.3 kW) and in concentration range from 0.1 – 10 µg g-1 of added standard. The effects of bare and coated nZVI particles were studied using fixed amount of 10 mg and with variation of solvents. The influence of iron from nZVI particles in plasma was found to be complex. The effects are mostly dependent on sensitivity of elements line, excitation potential of line and on degree of organic ligand loading.

iron nanoparticles, ICP-AES

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