US EPA

359671 

Journal Article 

Comparative studies of the determination of divalent cadmium, lead and copper in boiling medicinal herbs by stripping voltammetry and by atomic absorption spectrometry 

Hassan, A; Mayouf, JA 

2009 

Yes 

American Journal of Applied Sciences
ISSN: 1546-9239
EISSN: 1554-3641 

6 

4 

594-600 

Cadmium, lead and copper were determined in 10 Libyian boiling medicinal herb samples (whole herb of Cymbopogon schoenanthus, fresh ripe berries of Juniperus communis, leaves and flowering tops of Rosmarinus officinalis, leaves of Ruta graveolens, whole plant of Urtica urens, flowering plant without roots of Origanum majorana, whole herb without roots of Haplophyllum tuberculatum, herb while flowering without roots of Marrubium vulgare, whole herb without roots of Scrophularia canina and flowering heads of Artemisia herba-alba) by differential pulse anodic stripping voltammetry as well as by atomic absorption spectrometry. The voltammetric method was performed at Hanging Mercury Dropping Electrode in Briton-Robinson buffer solution of pH ~2.1 at 25±0.1°C. The sample preparation was carried out by boiling 2.0 g of a finely pulverized plant sample for 10 minutes, 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 to 0.103, 0.205 to 1.751 and 0.198 to 2.124 mg/g, respectively. Copper was determined by Flame Atomic Absorption Spectrometry and the mean level ranged from 0.202 to 2.010 mg/g. On the other hand, the mean levels obtained for determination of cadmium and lead by Graphite Furnace Atomic Absorption Spectrometry ranged from 0.006 to 0.085 and from 0.220 to 1.850 mg/g, respectively. 

analytical methods; anodic stripping voltammetry; atomic absorption spectroscopy; boiling; cadmium; chemical composition; copper; flowers; fruits; lead; leaves; medicinal plants; metal ions; plant composition; roots; rosemary; Libya; Artemisia herba-alba; Cymbopogon schoenanthus; Haplophyllum tuberculatum; Juniperus communis; Marrubium vulgare; Origanum majorana; Rosmarinus officinalis; Ruta graveolens; Scrophularia; Urtica urens; Artemisia; Asteraceae; Asterales; dicotyledons; angiosperms; Spermatophyta; plants; eukaryotes; Cymbopogon; Poaceae; Cyperales; monocotyledons; Haplophyllum; Rutaceae; Sapindales; Juniperus; Cupressaceae; Pinopsida; gymnosperms; North Africa; Africa; Mediterranean Region; Developing Countries; Marrubium; Lamiaceae; Lamiales; Origanum; Rosmarinus; Ruta; Scrophulariaceae; Scrophulariales; Urtica; Urticaceae; Urticales; analytical techniques; chemical constituents of plants; drug plants; medicinal herbs; officinal plants; Rutales; Scrophularia canina; Horticultural Crops (FF003) (New March 2000); Plant Composition (FF040); Techniques and Methodology (ZZ900)