Monitoring of trace amounts of heavy metals in different food and water samples by flame atomic absorption spectrophotometer after preconcentration by amine-functionalized graphene nanosheet

Abstract

We are introducing graphene oxide modified with amine groups as a new solid phase for extraction of heavy metal ions including cadmium(II), copper(II), nickel(II), zinc(II), and lead(II). Effects of pH value, flow rates, type, concentration, and volume of the eluent, breakthrough volume, and the effect of potentially interfering ions were studied. Under optimized conditions, the extraction efficiency is >97 %, the limit of detections are 0.03, 0.05, 0.2, 0.1, and 1 μg L(-1) for the ions of cadmium, copper, nickel, zinc, and lead, respectively, and the adsorption capacities for these ions are 178, 142, 110, 125, and 210 mg g(-1). The amino-functionalized graphene oxide was characterized by thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, and Fourier transform infrared spectrometry. The proposed method was successfully applied in the analysis of environmental water and food samples. Good spiked recoveries over the range of 95.8-100.0 % were obtained. This work not only proposes a useful method for sample preconcentration but also reveals the great potential of modified graphene as an excellent sorbent material in analytical processes.

Electrochemical determination of inorganic mercury and arsenic—A review

“…Atomic absorption spectrophotometry is a standard analytical technique in which trace metals are detected individually in solution form Behbahani et al 2014b;Behbahani et al 2014c;Behbahani et al 2014d;Behbahani et al 2014e;Behbahani et al 2014f;Behbahani et al 2014g;Ebrahimzadeh and Behbahani 2013;Fouladian and Behbahani 2014;Nabid et al 2014;Salarian et al 2014). The two modes, Flame atomic absorption spectrophotometry (FAAS) and Graphite furnace atomic absorption spectrophotometry (GFAAS), are based on the same principle.…”

Use of Dried Blood Spots for Estimating Children?s Exposures to Heavy Metals in Epidemiological Research

“…In fact, As, Pb, Hg, and Cd are listed as the 1 st , 2 nd , 3 rd , and 7 th most important hazardous substances on the Agency for Toxic Substances and Disease Registry's 2013 CERCLA priority list of 275 substances, respectively. Exposure to heavy metals can occur through a variety of exposure routes, including inhalation as dust and fumes [17,18], and ingestion from food and water [19][20][21], and can cause a wide spectrum of health problems including convulsions, coma, renal failure, injuries to the lungs and neurologic system, memory loss, delirium, diabetes, kidney damage, and a variety of cancers [22]. In addition, heavy metals can cross the placental barrier during pregnancy resulting in toxic exposures during highly susceptible periods of fetal development [23][24][25].…”

Solid phase extraction and trace monitoring of cadmium ions in environmental water and food samples based on modified magnetic nanoporous silica

“…Various SPE materials have been successfully used for preconcentration and separation of heavy metal ions at trace levels [11][12][13][14][15][16][17][18][19].…”