Evaluation of some toxic metals in blood samples of smokers in Saudi Arabia by inductive coupled plasma mass spectrometry

Purpose: To determine some toxic elements in the blood of cigarette and tobacco pipe smokers in Riyadh, Saudi Arabia.Methods: The study setting was Riyadh, the capital city of Saudi Arabia, Riyadh City. Male volunteers, aged 20 - 58 year, whose blood samples were collected, were classified into three groups of cigarette smokers (N = 30), tobacco pipe smokers (N = 30) and non-smokers (24). Inductive coupled plasma mass spectrometry (ICP-MS) measurement was conducted to determine the concentration of toxic metals in the blood samples after microwave acid digestion.Results: The mean concentrations of cadmium (Cd), lead (Pb), arsenic (As), mercury (Hg) and nickel (Ni) were 0.23 ± 0.30, 26.42 ± 20.08, 19.43 ± 10.00, 8.77 ± 6.98 and 79.57 ± 70.51), respectively, for cigarette smokers; (0.31 ± 0.19, 8.11 ± 8.60, 4.80 ± 3.01, 13.05 ± 3.01 and 9.96 ± 5.00), respectively, for tobacco pipe smokers; and 0.07 ± 0.20, 3.89 ± 5.82, 10.09 ± 2.75, 10.44 ± 5.37 and 1.60 ± 2.77), respectively, non-smokers.Conclusion: The results showed that the blood concentrations of heavy metals in smokers were higher than those in non-smokers.Keywords: Blood, Heavy metals, Smokers, Tobacco pipe smokers, Inductive coupled plasma mass spectrometr

Ionophore-based potentiometric PVC membrane sensors for determination of phenobarbitone in pharmaceutical formulations

The fabrication and development of two polyvinyl chloride (PVC) membrane sensors for assaying phenobarbitone sodium are described. Sensors 1 and 2 were fabricated utilizing β- or γ-cyclodextrin as ionophore in the presence of tridodecylmethylammonium chloride as a membrane additive, and PVC and dioctyl phthalate as plasticizer. The analytical parameters of both sensors were evaluated according to the IUPAC guidelines. The proposed sensors showed rapid, stable anionic response (-59.1 and -62.0 mV per decade) over a relatively wide phenobarbitone concentration range (5.0 × 10-6-1 × 10-2 and 8 × 10-6-1 × 10-2 mol L-1) in the pH range of 9-11. The limit of detection was 3.5 × 10-6 and 7.0 × 10-6 mol L-1 for sensors 1 and 2, respectively. The fabricated sensors showed high selectivity for phenobarbitone over the investigated foreign species. An average recovery of 2.54 μg mL-1 phenobarbitone sodium was 97.4 and 101.1 %, while the mean relative standard deviation was 3.0 and 2.1 %, for sensors 1 and 2, respectively. The results acquired for determination of phenobarbitone in its dosage forms utilizing the proposed sensors are in good agreement with those obtained by the British Pharmacopoeial method