Pre-concentration and Determination of Low-traces of Copper Ions in Different Mediums Using Dispersive Liquid-liquid Micro-extraction (DLLME)
الموضوعات :
Davood Kaviani
1
(Young Researchers and Elite Club, East Tehran Branch, Islamic Azad University, Tehran, Iran)
Mohammad Hossein Bigtan
2
(Department of chemistry, Arak branch, Islamic Azad University, Arak, Iran)
Majid Saghi
3
(Young Researchers and Elite Club, Arak Branch, Islamic Azad University, Arak, Iran)
الکلمات المفتاحية:
ملخص المقالة :
In the paper, in order to pre-concentrate and measure the low values of Cu ions, the new, simple,quick and very sensitive method of Dispersed Liquid-Liquid Micro Extraction (DLLME) coupledwith flame Atomic Absorption spectrometry (AA) has been utilized. The DLLME techniquecoupled with AA )AA-DLLME) was run inside one narrow tube which constitute aqueous samples.In this method, a mixture of toluene and methanol 90:10 (v/v) was injected into the aqueous sampleas extractor and disperser agent and then Cu and diethyldithiocarbamate (DDTC) complex wasconcentrated inside the toluene and was collected on the sample solution. In order to optimize thefactors affecting on the process, different parameters affected on the Cu extraction such as kind andvolume of extractor, volume of dispersing solvent, pH of sample solution, ligand concentration,time for bubble formation and salt effect were studied. Under optimal condition, limit of detection(LOD), relative standard deviation (RSD) and limit of linearity (LOL) for calibration curve weremeasured and were obtained as: 1.2 μg.l-1, 3.64% and 0.01-1 mg.l-1, respectively. This method wassuccessfully applied to determine Cu in environmental waters, milk powder, liquid milk and orangejuice.
