Antimony leaching release from brake pads: Effect of pH, temperature and organic acids

Journal of Environmental Sciences (China)
Xingyun HuSisi Li

Abstract

Metals from automotive brake pads pollute water, soils and the ambient air. The environmental effect on water of antimony (Sb) contained in brake pads has been largely untested. The content of Sb in one abandoned brake pad reached up to 1.62×10(4) mg/kg. Effects of initial pH, temperature and four organic acids (acetic acid, oxalic acid, citric acid and humic acid) on Sb release from brake pads were studied using batch reactors. Approximately 30% (97 mg/L) of the total Sb contained in the brake pads was released in alkaline aqueous solution and at higher temperature after 30 days of leaching. The organic acids tested restrained Sb release, especially acetic acid and oxalic acid. The pH-dependent concentration change of Sb in aqueous solution was best fitted by a logarithmic function. In addition, Sb contained in topsoil from land where brake pads were discarded (average 9×10(3) mg/kg) was 3000 times that in uncontaminated soils (2.7±1 mg/kg) in the same areas. Because potentially high amounts of Sb may be released from brake pads, it is important that producers and environmental authorities take precautions.

References

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May 24, 2008·Environmental Science & Technology·Akihiro IijimaNaoki Furuta
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Jul 12, 2011·The Science of the Total Environment·Mengchang HeZhiyou Fu

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Citations

May 18, 2017·Environmental Technology·Hailin YangMengchang He
Jan 16, 2019·Environmental Monitoring and Assessment·Karolina Lewińska, Anna Karczewska
Apr 17, 2021·Environmental Science and Pollution Research International·Haibo WangYongfeng Jia
Sep 3, 2021·Chemosphere·Francesco GuarinoAngela Cicatelli

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