Adekunle Abolanle S, Oyekunle John A O, Baruwa Suliat O, Ogunfowokan Aderemi O, Ebenso Eno E
Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria.
Department of Chemistry, School of Mathematical and Physical Sciences, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa.
Toxicol Rep. 2014 May 22;1:243-251. doi: 10.1016/j.toxrep.2014.05.008. eCollection 2014.
This work assessed levels of heavy metals exposure from silver coatings of mobile phones recharge cards of three major companies (designated as A, B and C) with price denominations 100, 200 and 400 from companies A, B and C respectively, which were carefully scratched using a plastic scraper into a glass tube. The coatings were acid digested for total metal concentration, while speciation experiment for Mn, Cu, Cd and Pb was carried out. Total metals and speciation analysis were done using AAS and XRF techniques. The total metal concentration from XRF analysis was in the range: Ca (70-2140 μg/g), K (20-4930 μg/g), Sc (80-270 μg/g), Ti (1530-12,580 μg/g), Fe (50-6660 μg/g), Ni (20-2040 μg/g), Cu (20-850 μg/g) and Zn (40-460 μg/g). Cr had the lowest concentration (10 μg/g) in A ( 400) while Ti had the highest concentration (12,580 μg/g) in C ( 500) for all the coatings analyzed. AAS and XRF results agreed closely except for Fe with higher concentration. A ( 100) contained high concentration of the metals compared with others. Speciation study identified Mn as the most mobile element when present in the environment.
这项工作评估了三家主要公司(分别指定为A、B和C)的手机充值卡银涂层的重金属暴露水平,这些充值卡面额分别为100、200和400,分别来自A、B和C公司,使用塑料刮刀小心地将其刮入玻璃管中。对涂层进行酸消解以测定总金属浓度,同时对锰、铜、镉和铅进行形态分析。使用原子吸收光谱法(AAS)和X射线荧光光谱法(XRF)进行总金属和形态分析。XRF分析得出的总金属浓度范围为:钙(70 - 2140微克/克)、钾(20 - 4930微克/克)、钪(80 - 270微克/克)、钛(1530 - 12580微克/克)、铁(50 - 6660微克/克)、镍(20 - 2040微克/克)、铜(20 - 850微克/克)和锌(40 - 460微克/克)。在所分析的所有涂层中,铬在A公司(面额400)的浓度最低(10微克/克),而钛在C公司(面额500)的浓度最高(12580微克/克)。除铁的浓度较高外,AAS和XRF的结果非常吻合。与其他相比,A公司(面额100)的金属浓度较高。形态研究表明,锰在环境中时是最易迁移的元素。