جستجوی مقالات مرتبط با کلیدواژه « inductively coupled plasma » در نشریات گروه « پزشکی »

The amount of heavey metal elements in tea mighg have significant impact on human health. In the present study, the amount of heavy metal elements such as cadmium (Cd), lead (Pb), zinc (Zn), iron (Fe), aluminum (Al) and copper (Cu) in some imported tea samples and local tea samples cultivated in Iran have been evaluated.

The Tea samples were prepared by three different methods including Digestion, Brew and Infusion and the concentration of heavy metals in the prepared samples were measured by ICP-OES and ICP-MS.

Aluminum with a concentration of 853.9 µg/g and the cadmium element with the concentration of 0.99 µg/g were found to be the highest and lowest in the samples examind, respectively. Among the extraction methods, the concentration of extracted elements in digestion method was significantly higher than other methods. The statistical analysis of the obtained results by ICP-OES and ICP-MS revealed that there is no significant difference between the detected concentrations of Al, Zn, Fe, Cu and Cd eighter in the local or imported tea samples in each of the extraction methods. The obtained result showed that the amount of detected Pb in the ICP-MS technique for both internal and imported tea samples is significantly higher than those of ICP-OES technique.

Concentrations of all metal elements in the studied tea samples were significantly higher than of standard reference (NIESNO.7). However, the estimated daily intake of all elements for each adult person is still within the allowable level of the World Health Organization.

Heavy metals being among the major pollutants of aquatic ecosystems are considered as high-toxicity pollutants for organisms due to the non-biodegradable and persistent potential in the environment. Therefore, this study was carried out to analyse the presence of heavy metals (Zn, Cd, Cr and Cu) in water of Marivan River in 2013.
Material & In this cross-sectional study, forty samples were taken from five selected stations during spring and summer seasons in 2013. After taken samples preparation, the concentrations of metal ions were investigated by spectrophotometry with three replications. All statistical analyses were performed using the SPSS 19.0 statistical package (p The results showed that the mean concentrations of metals (µg/l) in water samples for spring season were equal to 26.20±11.34, 0.73±0.06, 1.50±0.11 and 121.10±14.05 for Zn, Cd, Cr and Cu, respectively and in water samples for summer season were equal to 27.10±24.72, 0.72±0.05, 1.50±0.16 and 123.80±31.27 for Zn, Cd, Cr and Cu, respectively. Also, the mean concentrations of the evaluated metals compared with WHO and Iran DOE permissible limits showed a significant difference (P Although the water of Marivan River was not contaminated to heavy metals during the study period. But due to the establishment and development of industrial, urban and agricultural activities along the river and its uncontrolled discharges of wastewater into the river, pollution and decrease of water quality in the near future is not unexpected.

Seemingly no research has investigated so far to heavy metals determination in leafy vegetables widely consumed in Zanjan city using inductively coupled plasma (ICP) spectrometer. Therefore, the objective of present research was determine heavy metals contents (Zn, Pb, Cd, Co, Ni) in some selected leafy vegetables widely consumed in Zanjan city (Dill, leek, Coriander, Parsley and Cress) from three major cultivation areas (Rah Ahan, Dizaj Bala and Kushkan).
For more accurate results four pre-treatment methods (wet ashing with electrical furnace, acid leaching method and ultrasound-assisted acid leaching) and inductively coupled plasma (ICP) spectrometry were evaluated.
Obtained results show that wet ashing is the effective method among other pre-treatment procedures. According to the obtained results about heavy metals measurement the level of these metals depended on the type of vegetable and different cultivation areas, so Rah Ahan region showed the highest contamination. Among evaluated heavy metals only the level of the Pb in all samples was higher than permissible levels recommended by standards (1.8-2.5 mg/Kg). The maximum and minimum concentrations of Pb were exhibited by Dill (9.28±1.95 mg/Kg), and leek (2.35±3.33 mg/Kg), respectively. The mean Ni, Cd and Co concentrations in vegetable samples varied from 0.44-3.93 mg/Kg, 0.1-0.2 mg/Kg and 0.5-1.08 mg/Kg, respectively, which were lower than the recommended safe limits. In the case of Zn, all of samples except Cress showed the concentration levels below the acceptable tolerance level (50 mg/Kg).
In general it can be concluded that pretreatment methods, both vegetable and cultivated area could be helpful in determining the amount of heavy metals pollution. Considering the importance of accurate determination of these metals, these factors should be considered.

Evaluation of food contaminants particularly heavy metals in tuna and its products، that might be considered as an indicator of water pollution is quite important. In this study the concentrations of mercury، cadmium and lead in canned tuna produced in four countries measured and evaluated. Samples of canned tuna from Oman Sea، coasts of India، Seychelles and Ghana were obtained from one of the distributing companies in Iran. The concentration of mercury was measured by cold vapor technique using atomic absorption spectroscopy (AAS). The concentration of cadmium and lead were determined by inductively coupled plasma - atomic emission spectroscopy (ICP-AES). The results were compared with the national، european and international standards. Statistical analyses of the results were carried out using SPSS software and analyses of variance (ANOVA) were used to detect significant differences. The results indicated that the concentrations of mercury، for all the samples examined were within the standard limit while for cadmium and lead only 25% and 50% of the samples examined were within the defined standard limits respectively. it was conclude that Chabahar region of Oman Sea and Ghana coast had the highest and least concentrations of heavy metals as contaminants respectively.