Abstract
In the present investigation, 11 cow’s milk samples (pasteurized and long life) were collected from supermarkets in Misurata city, Libya. For the determination of metal contents, the milk samples were subjected to the optimized microwave digestion method using HNO3 and H2O2. The levels of Na, K, Mg, Ca, Fe, Cu, Cr, Mn, Co, Ni, Zn, Cd, and Pb were evaluated by Microwave Plasma - Atomic Emission Spectrophotometer (MP-AES 4100). It was found that potassium is the most concentrated essential metal while zinc is the highest detected heavy metal in all milk samples. The levels of Co and Cd were not detected in all milk samples under investigation (lower than instrumental detection limits). The mean concentrations of the detected metals were as follows: 828.05±0.82, 587.57±0.87, 512.38±0.30, 73.79±0.19, 2.014±0.19, 1.89±0.16, 0.178±0.03, 0.061±0.02, 0.074±0.01, 0.053±0.001, and 0.045±0.001 for: K, Ca, Na, Mg, Zn, Fe, Cu, Mn, Ni, Pb, and Cr ppm, respectively. There is no significant difference in the mean concentrations of Ni, Cr and Pb between the investigated milk samples. Though, the levels of essential and heavy metals observed were similar with other reported values in the literature. Â
Highlights
To monitor and support products and methods quality, good feature determinations are essential, both in manufacture, business, and in research
Mercury, and lead remains in milk are of specific interest since milk is mostly consumed by infants and children [Tajkarimi et al 2008], and the estimation of these metals quantities in milk is especially attended by international organizations
Several techniques were utilized such as flame and flameless atomic absorption spectrometry (FAAS and ETAAS), inductively coupled plasma optical emission spectrometry (ICP-OES), inductively coupled plasma mass spectrometry (ICP-MS), flow injection spectrometry (FIS), fluorescence atomic spectrometry (FAS), capillary zone electrophoresis (CZE), differential pulse anodic stripping voltammetry (DPASV), atomic and stripping potentiometry (ASP) [Cava-Montesinos et al 2004, Suarez-Luque et al 2007, Elsherif et al 2012a; 2012b; 2013, 2015]
Summary
To monitor and support products and methods quality, good feature determinations are essential, both in manufacture, business, and in research. Mercury, and lead remains in milk are of specific interest since milk is mostly consumed by infants and children [Tajkarimi et al 2008], and the estimation of these metals quantities in milk is especially attended by international organizations For performing these estimations, several techniques were utilized such as flame and flameless atomic absorption spectrometry (FAAS and ETAAS), inductively coupled plasma optical emission spectrometry (ICP-OES), inductively coupled plasma mass spectrometry (ICP-MS), flow injection spectrometry (FIS), fluorescence atomic spectrometry (FAS), capillary zone electrophoresis (CZE), differential pulse anodic stripping voltammetry (DPASV), atomic and stripping potentiometry (ASP) [Cava-Montesinos et al 2004, Suarez-Luque et al 2007, Elsherif et al 2012a; 2012b; 2013, 2015]. The purpose of the present work is to evaluate the concentrations of major metals (Na, K, Ca, and Mg) and heavy metals (Fe, Cu, Zn, Co, Ni, Cr, Pb, Cd, and Mn) in eleven long life and pasteurized milk samples available in Misurata city markets and to find out whether the levels of these metals are lower or higher than the recommended concentrations demanded for human consumption; children, and to attain the extent of contamination
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