Dodecylbenzene sulfonate-coated magnetite nanoparticles as a new adsorbent for solid phase extraction-spectrophotometric determination of ultra trace amounts of ammonium in water samples

Extraction of ammonia and nitrite using modified magnetite iron oxide nanoparticles before spectrophotometric determination in different water samples

“…Ammonia is also recognised as a toxic substance to diatoms and fish in the pH range of 4.5-7.4 [2]. High concentrations of ammonia in drinking water and other water resources can lead to adverse effects for humans and environment.…”

“…Nevertheless, these colorimetric standard assays are not sensitive enough to be directly applied to water samples. Therefore, in order to circumvent the low sensitivity of spectrophotometric methods several sample preparation techniques such as solid-phase extraction (SPE) [2,8,14,15], cloud point extraction (CPE) [5,16,17] or liquid-phase microextraction (LPME) [18][19][20] have been developed. These techniques help in separation and preconcentration of nitrite and ammonium in aqueous matrices prior to spectrophotometric determination.…”

“…The hydrophobic layers on the surface of MNPs provide suitable conditions for non-polar components to interact with MNPs [2]. This magnetic solid-phase extraction (MSPE) method based on mixed-hemimicelles assemblies (hemimicelles/admicelles) has been used for the extraction and preconcentration of a variety of inorganic [2,11,[23][24][25][26][27] and organic [22,[28][29][30][31][32][33][34][35][36][37] compounds from various matrices.…”

Synthesis of magnetite–gold nanoshells by means of the secondary gold resource

“…Methods that have been applied for recovery of precious metals from its solutions include zinc-dust cementation [29], carbon adsorption [30], solvent extraction [30], ion exchange [30] and recently separation with nanoparticles [31,32]. Recovery of gold from waste is more attractive than that of most other metals.…”

Separation/Preconcentration and Determination of Trace Amounts of Palladium Using Modified Alumina Coated Magnetite Nanoparticles Without Chelating Agent

“…Combining nanoparticles adsorption with magnetic separation is good for avoid passing through the column in conventional SPE methods. Magnetite nanoparticles (MNPs) are suitable for this propose and surface modification of MNPs is a challenged key for this application [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] . Several analytical methods such as spectrophotometry 35 , flame atomic absorption spectrometry (FAAS) 36 , inductively coupled plasma-mass spectrometry (ICP-MS) 37 , inductively coupled plasma-optical emission spectrometry (ICP-OES) 38 and electrochemical methods 39 have been used for determination of trace amounts of palladium.…”