جستجوی مقالات مرتبط با کلیدواژه « Polarography » در نشریات گروه « پزشکی »

Pickled cucumber is frequently consumed by Iranians. According to the production process, there are two forms of pickled cucumber including industrial and fermentative. There is not an appropriate monitoring system available for the production of the latter form; therefore, high levels of heavy metals might be present in this type of pickled cucumber. Accordingly, so the levels of cadmium, zinc, lead and copper were measured in fermentative pickled cucumbers obtained from the Tehran market via the polarographic method. Polarography is a subclass of voltammetry where the working electrode is a dropping mercury electrode (DME) or a static mercury drop electrode (SMDE), which are useful for their wide cathodic ranges and renewable surfaces. Fifty different samples of pickled cucumbers were purchased from the market. Of each sample, dry ashes were produced. Measurement was repeated three times and the acquired data was then analyzed. The mean levels of zinc and copper in the evaluated samples were significantly lower than the standard limits respectively presented by the EOS and Codex (P value<0.001) while the mean level of cadmium and lead was slightly higher than the standard limit established by Codex with no significant differences observed (P values=0.450 and 0.246, respectively).

Drinking water should be free of any chemical contaminants. One of the important aspects of drinking water pollution is presence of heavy metals that can be hazardous for consumer’s health. This study was carried out to determine the concentration of heavy metals in urban and rural drinking water networks of Hamadan province in 2016.
This study was a descriptive cross-sectional study. In order to investigate the concentration of heavy metals in drinking water resources of the province, a total of 60 samples (38 rural and 22 urban samples) from water distribution networks was taken based on standard methods. After transferring the samples to the laboratory, the elements were measured by polarography and the results were analyzed using Excel software.
The heavy metals average concentration of Hg, As, Cr (total), Cu, Pb, Cd and Zn in all samples was 0.565, 6.733, 2.045, 11.637, 2.636, 0.031 and 282.596 µg.L-1 respectively. Only 1.67% of samples were contaminated with mercury, 3.33% were contaminated with lead and 8.33% samples were contaminated with arsenic.
The results showed that the average concentration of heavy metals measured in all samples of Hamadan province was lower than the maximum allowed in the national and international standards. Apart from the worrying situation of arsenic amount in samples of a small number of villages, it can be concluded that the status of drinking water sources in terms of heavy metals contamination is favorable in Hamadan province, but annually control of arsenic is strongly recommended.

Herbs are considered as effective remedies to heal diseases worldwide. As a result of given increasing trend of air, water and soil pollutions, health and quality of these herbs have now become a quite serious and important issue to be attention to. One of the main concerns is the presence of heavy metals in herbal drugs. In this study, the amount of lead, cadmium, and copper in edible herbal dribbles present in Iranian drug market have been measured with the aid of a polarography technique, Differential Pulse Stripping Voltammetry (DPSV). The simultaneous determination of the target elements was done in samples obtained from herbal drops present in citywide drugstores was performed. It was observed that the mean values of measured ions in the samples were beneath WHO and FDA’s standards and the concentration of cadmium in most samples was beneath the applied technique detection limit and consequently could not be traced