Abstract
Cadmium, lead and copper were determined in ten Libyian boiling medicinal herbs samples by differential pulse anodic stripping voltammetry as well as by atomic absorption spectrometry. Voltammetric method was done at Hanging Mercury Dropping Electrode (HMDE) in Briton-Robinson buffer solution of pH ~2.1 at 25± 0.1°C. The sample preparation was carried out by boiling 2.0g of a finely pulverized plant sample for 10 min, cooled, filtered and completed to 50 mL measuring flask by deionized water. The optimal preconcentration potentials and times for the detection of these metal ions in all sample solutions have been studied. The concentration of each metal ion was determined by the standard addition method. The statistical parameters i.e. slope, standard deviation, correlation coefficient and confidence have been calculated. The levels of Cd(II), Pb(II) and Cu(II) ranged from 0.006-0.103, 0.205-1.751 and 0.198-2.124 µg g-1 respectively. Copper was determined by Flame Atomic Absorption Spectrometry (FAAS) and the mean level was ranged from 0.202-2.010 µg g−1 . On the other hand the mean levels obtained for determination of cadmium and lead by Graphite Furnace Atomic Absorption Spectrometry (GFAAS) ranged from 0.006 to 0.085 and from 0.220-1.850 µg g-1 respectively.
Highlights
INTRODUCTIONBody, including cell maturation and skeletal growth. Lead can cause hypertension, reproductive toxicity
Cadmium is one of the few elements that have no constructive purpose in the human body
Its toxicity threatens the health of the body by weakened immune system, kidney disease and live excess copper may be absorbed in the intestinal tissues which lead to intestinal disorders, impaired healing and reduced resistance to infections[16,17,18]
Summary
Body, including cell maturation and skeletal growth. Lead can cause hypertension, reproductive toxicity. Lead exposure can lead to renal effects such as fanconi-like syndromes, chronic nephropathy and gout [11,12,13,14,15] Copper is both vital and toxic for many biological organisms and ecosystems. The sample preparation was carried out by dry-ashing 1.0 g of plant sample for 2.5 h at 500°C[39] .This prompted us to study the determination of cadmium, lead and copper by differential pulse anodic stripping voltammetry as well as by flame atomic absorption spectrometry of copper and graphite furnace atomic absorption spectrometry of cadmium and lead in buffer solution of pH ~2.1 as the extension of a series of our investigations[40,41,42,43] for determination of industrial and biological important elements Cadmium and lead were determined in medicinal plants by differential pulse anodic stripping after preconcentration of the metals in 0.8 M HCl at 0.73V for 180 sec. and the sample preparation was carried out by dry-ashing 1.0 g of plant sample for 2.5 h at 500°C[39] .This prompted us to study the determination of cadmium, lead and copper by differential pulse anodic stripping voltammetry as well as by flame atomic absorption spectrometry of copper and graphite furnace atomic absorption spectrometry of cadmium and lead in buffer solution of pH ~2.1 as the extension of a series of our investigations[40,41,42,43] for determination of industrial and biological important elements
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