Evaluation of Selected Heavy Metals in Indoor Dust and Interior Painted Walls of Nursery Schools in Nairobi County, Kenya

Kevin Omondi Ondoo, Joel Klement Ogilo, Anam Ouma Onditi, Ali Mohammed Salim, Denis Magero, Antony M. S. Pembere
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Abstract

School playgrounds found in painted environments have become death chambers for millions of innocent children who unknowingly ingest toxic metals. The objective of this study is to determine the levels of the heavy metals in paint chips from painted interior walls and indoor dust samples from 14 selected nursery schools in Nairobi County. The paint chips and indoor dust samples collected were digested using the Environmental Protection Agency method SW846 3050B then analyzed using Flame Atomic Absorption Spectrometry. Iron (Fe) had the highest concentrations in both the paint chip from interior walls and the indoor dust while Cadmium (Cd) had the lowest concentration followed by Chromium (Cr), Lead (Pb) and Zinc (Zn) respectively. 50% of the nursery schools had Lead (Pb) concentrations that exceeded the 90 µg/g limit set by KEBS. For Cadmium (Cd) and Chromium (Cr), the concentration in the nursery schools and the indoor dust was below the 200 µg/g used in Germany. Generally, the correlation between the various metal pairs for the samples analyzed showed a non-significant correlation with exception of Lead - Iron (Pb-Fe) and Chromium - Cadmium (Cr-Cd) for the indoor dust samples from pre-schools. The t-tests carried out show that levels of the heavy metals in the paint chip did not differ significantly with the levels in the indoor dust for nursery schools at 95% confidence level.
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肯尼亚内罗毕县幼儿园室内粉尘和室内油漆墙中选定重金属的评价
学校操场上的油漆环境已经成为数百万无辜儿童的死亡室,他们在不知情的情况下摄入了有毒金属。本研究的目的是确定内罗毕县选定的14所幼儿园粉刷内墙的油漆碎片和室内灰尘样本中的重金属水平。采用美国环保局(epa) SW846 3050B法对所采集的油漆屑和室内粉尘样品进行酶解,然后采用火焰原子吸收光谱法进行分析。室内墙面漆屑和室内粉尘中铁(Fe)含量最高,镉(Cd)含量最低,其次是铬(Cr)、铅(Pb)和锌(Zn)。50%的幼儿园铅浓度超过KEBS规定的90微克/克限值。幼儿园和室内粉尘中镉(Cd)和铬(Cr)的浓度均低于德国规定的200µg/g。除幼儿园室内粉尘样品中铅-铁(Pb-Fe)和铬-镉(Cr-Cd)外,各金属对之间的相关性一般不显著。t检验结果表明,在95%的置信水平上,油漆碎片中的重金属含量与幼儿园室内粉尘中的重金属含量没有显著差异。
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