The Safety of Schools Based on Heavy Metal Concentrations in Classrooms’ Dust: A Systematic Review and Meta-Analysis
| Autor: | Mozhgan MOGHTADERI, Saeed HOSSEINI TESHNIZI, Tahereh MOGHTADERI, Mohammad Ali ASHRAF, Habibollah FARAJI |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Iranian Journal of Public Health, Vol 49, Iss 12 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2251-6085 2251-6093 |
| Popis: | Background: Classroom is where children spend much of their time in; this study aimed to identify the concentration of heavy metals in the classroom dust based on the results of various studies in the world using the published data up to years 2018. Methods: Fifteen studies were selected for the study according to the inclusion and exclusion criteria. The mean concentration of 11 heavy metals including arsenic, barium, cadmium, cobalt, chromium, copper, iron, lead, manganese, nickel, and zinc was extracted. Results: The highest mean concentration of heavy metal (mg/kg) in classroom dust was related to iron (3904.7, 95%CI: 3657.1-8154.3), zinc (429.9, 95%CI: 182.8-677.1) and barium (419.2, 95%CI: 274.7-253.7), respectively. Subgroup analysis showed the maximum concentration (mg/kg) of iron in Iran (16945.5), zinc in Hong Kong (2293.5), barium in China (979.8), manganese in Iran (288.9), lead in Iran (258.8), chromium in Ghana (381.3), copper in Hong Kong (274.4), nickel in Iran (50.1), cobalt in China(43.4), arsenic in China(13.7) and cadmium in Hong Kong(8.7). Conclusion: Even safe and healthy classrooms can threaten children’s health by heavy metals. These metals are important since they are naturally found throughout the earth’s crust, accumulate in the food chain and contaminate drinking water as well as alloys in school equipment. |
| Databáze: | Directory of Open Access Journals |
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