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Showing 4 results for Heavy Metals
Toxic metals in the deposited particles from air of the training space of Amir Abad Campus, University of Birjand, 2012
Mr Rezaei, Mh Sayadi,
Volume 2, Issue 1 (1-2013)
Abstract

  Background: Composition of dust in the air due to contact with human via inhalation, ingestion and skin absorption will have a large impact on public health. In the learning environments such as universities, many people spend most of their day in contact with the dust. The purpose of this study was to evaluate the concentration of heavy metals lead, chromium and copper in the training space of the University of Birjand (Faculty of Agriculture and Natural Resources) and examining its ecological risks.

  Materials and Methods: This descriptive study evaluated a total of 16 samples where 4 samples pertained to the Faculty of Natural Resources and Environment and 12 samples were from the Faculty of Agriculture. For estimation of the heavy metals copper, chromium and lead, hydrochloric acid and nitric acid digestion were used. The concentration of heavy metals was measured using an atomic absorption instrument. T he regression coefficient was calculated by Ms Excle software.

  Results: The results showed that lead (3.414) and copper (14.884) degrees in the official room of the Faculty of Agriculture was more than the Faculty of Natural Resources and Environment while lead (2.575) and chromium (0.187) degrees were higher in the classrooms of the Faculty of Natural Resources. The regression correlation coefficient studies showed that the case study heavy metals had week correlation(R2 0.13 and 0.20) . The pollution index of the element chromium depicted the lowest pollution level and copper had the high pollution levels in some samples.

  Conclusions: However, the samples exhibited little ecological risks. Thus, the presence of these elements in dust does not lead to serious health hazards. Nevertheless, further studies at different time periods are worthwhile.


Contamination of barberry with heavy metals in the vicinity of Qayen Cement Company, Khorasan, Iran, in 2014: A Case study
Mr Rezaei, Mh Sayadi, M Khaksarnejad,
Volume 3, Issue 4 (10-2014)
Abstract

Background: Soil pollution and accumulation of heavy metals in crops in industrial areas is one of the most important environmental issues threatening the life of plants, animals, and humans. The aim of this study was to determine the concentration of Cr and Cd in the soil and barberry plants in farms surrounding the Qayen Cement Company, South Khorasan Province, Iran.

Materials and Methods: In this study, 8 soil samples were collected from a depth of 0-30 cm and 30-60 cm and 4 samples of barberry plant containing fruits and leaves in summer 2014. The concentrations of Cr and Cd in the samples were determined using atomic absorption spectrometry.

Results: The maximum concentration of Cr and Cd was observed in the soil sample collected from a depth of 0-30 cm (95.10 and 1.32 mg/kg of soil, respectively). The concentration of Cr and Cd was higher in the fruits of barberry than the leaves; 18.58 mg/kg and 59.45 µg/kg, respectively, which are higher than the standard values. Transfer factor was calculated as less than 1 for all stations.

Conclusions: According to obtained results, Qayen Cement Company has the greatest impact on plants in this region. The barberry fruit is the strategic product in Qayen; therefore, attention to and management of the impact of the cement factory on agricultural products is necessary.


The Concurrent Effect of Lead and Noise on Noise-Induced Hearing Loss at 4 kHz Frequency: An Experimental Study
Batol Masruri, Iraj Alimohammadi, Jamileh Abolghasemi, Parvaneh Yekzamani, Azadeh Ashtarinezhad,
Volume 11, Issue 1 (1-2022)
Abstract
Background: Hearing loss is an occupational chronic disabling and is due to complex processes of numerous risk factors such as excessive noise, ototoxic agents and aging. We aimed to examine the concurrent effect of lead and noise on rats' noise hearing function as a sub-acute exposure.
Materials and Methods: In this experimental study, 40 male rats were divided into 4 groups as 1) control group 2) exposed to 105 dB noise at 4 kHz frequency 8h/day, 6day/week for 4 weeks 3) exposed to 4 mg/kg lead acetate by gavage 6day/week for 4 weeks 4) exposed to both lead and noise. Blood lead levels were evaluated by Graphite Furnace Atomic Absorption Spectrometry. In addition, before and after exposure, the auditory brainstem response (ABR) was performed to examine the hearing loss in rats.
Results: The hearing threshold at noise exposure (105 dB at 4 kHz frequency) group indicated a significant increase (10 dB and 11.5 dB with click and tone burst stimuli, respectively) compared to the control group (p<0.0001). Moreover, there was a significant difference between the lead concurrent noise-exposed group and the control group regarding the latency of waveform II with both stimuli (p<0.0001). There was a positive correlation between Blood Lead Level in lead-treated rats with Auditory Brainstem Response threshold by tone burst stimulus (r = 0739, p = 0.015).
Conclusion: we concluded that lead and noise have a synergistic effect and can exacerbate hearing loss. However, additional studies at various doses are needed to confirm this finding.
 

Investigation of Heavy Metal Pollution in the Indoor Air of Traditional Coffee Houses in Tehran, Iran (2020)
Mehdi Ahmadian, Rasoul Yarahmadi, Masoud Salehi, Neda Mehrparvar, Azadeh Ashtarinezhad,
Volume 13, Issue 3 (9-2024)
Abstract
Background: Exposure to heavy metals in coffee house air poses notable occupational health risks. This study aimed to quantify heavy metal and particulate pollution levels in Tehran's traditional coffee houses.
Materials and Methods: In this study of 57 Tehran coffee houses, samples were collected using personal sampling pumps and 0.8 µm cellulose ester filters following National Institute for Occupational Safety & Health (NIOSH-7300) guidelines. Heavy metal levels were determined using ICP-AES analysis.
Results: The results showed that iron and magnesium metals had the lowest concentration of metals in the air within coffee houses, with an average of 10-8 µg/m3, whereas manganese metals had the highest concentration, with an average of 4.507 10-5 µg/m3. Two of the 57 locations under study had greater Threshold Limit Values (TLVs) than the others, whereas other locations had lower TLV mixtures, and these two locations had mixed TLVs of 1.315 and 1.282, respectively. 96.49 percent of the 57 measured locations had a mixed TLV below the standard and 3.51 percent above it. According to the findings of the current study, there are eight heavy metals present in Traditional coffee houses air, ranging in concentration from more to less of Fe, Mg > Pb > Ag > Cu > Ca >Na >Mn.
Conclusions: The health of coffee house employees may suffer adverse effects from chronic exposure to these elements. To protect the health of Traditional Coffee Houses employees, it is essential to incorporate engineering controls for indoor air quality, monitor ventilation systems, and ensure compliance with safety regulations.

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