Elehinafe Francis B, Okedere Oyetunji B, Oladimeji Temitayo E, Anabui Sarah O
Department of Chemical Engineering, College of Engineering, Covenant University, Ota, Ogun State, Nigeria.
Department of Chemical Engineering, Faculty of Engineering, Osun State University, Osogbo, Osun State, Nigeria.
Environ Health Insights. 2022 Apr 13;16:11786302221091741. doi: 10.1177/11786302221091741. eCollection 2022.
Mosquito coils of various brands are frequently burnt in indoor environments to drive away mosquitoes-the vector for malaria parasite in regions where the disease is endemic. Emissions from the coils could be a source of indoor air pollution. In this study, various brands of mosquito coils obtained from retail shops in Lagos, Nigeria were burnt in an environmental test box with a view to characterizing carbon monoxide (CO), nitric oxide (NO), and nitrogen dioxide (NO) in the gaseous emissions as well as elemental concentrations of the ash. Emission characterization achieved with the RAS1700 bio-gas analyzer while AAS was adopted for elemental analysis of the mosquito coil ashes. The emission factor of CO, NO and NO from the coil samples ranged between 0.00138 to 0.26277 μg/m, 0.0002 to 0.00454 μg/m, and 0.000074 to 0.00714 μg/m, respectively. These values were found to be lower than permissible indoor levels recommended by NIOSH. The range of concentrations of Pb, Zn, Cd, Cr, Cu, As, Hg, Fe in the coil ashes from all the brands were 0.02 to 0.04 mg/g, 0.011 to 0.02 mg/g, 0.001 to 0.003 mg/g, 0.004 to 0.008 mg/g, 0.004 to 0.006 mg/g, 0.0001 to 0.0004 mg/g, 0.001 to 0.003 mg/g, and 0.124 to 0.14 mg/g, respectively. Although, the concentrations of the pollutants obtained in this study are within the recommended limits, prolong exposure could trigger chronic disease conditions. Adequate ventilation of indoor environments or utilization of mosquito nets in place of coils could be considered.
在疟疾流行地区，人们经常在室内点燃各种品牌的蚊香来驱赶蚊子，蚊子是疟原虫的传播媒介。蚊香的排放物可能是室内空气污染的一个来源。在本研究中，从尼日利亚拉各斯的零售店获取的各种品牌蚊香在环境测试箱中燃烧，旨在对气体排放中的一氧化碳（CO）、一氧化氮（NO）和二氧化氮（NO₂）以及灰烬中的元素浓度进行表征。使用RAS1700生物气体分析仪进行排放物表征，同时采用原子吸收光谱法对蚊香灰烬进行元素分析。蚊香样品中CO、NO和NO₂的排放因子分别在0.00138至0.26277μg/m、0.0002至0.00454μg/m以及0.000074至0.00714μg/m之间。发现这些值低于美国国家职业安全与健康研究所（NIOSH）建议的室内允许水平。所有品牌蚊香灰烬中铅（Pb）、锌（Zn）、镉（Cd）、铬（Cr）、铜（Cu）、砷（As）、汞（Hg）、铁（Fe）的浓度范围分别为0.02至0.04mg/g、0.011至0.02mg/g、0.001至0.003mg/g、0.004至0.008mg/g、0.004至0.006mg/g、0.0001至0.0004mg/g、0.001至0.003mg/g以及0.124至0.14mg/g。尽管本研究中获得的污染物浓度在推荐限值内，但长期接触可能引发慢性疾病。可以考虑对室内环境进行充分通风或使用蚊帐代替蚊香。
