Fifty-four amines used as antioxidants and/or antiozonants for elastomers were separated on silica gel thin-layer plates with benzene and benzene-ethyl acetate-acetone (100:5:1) as developing solvents and N-chloro-2,6-dichloro-p-benzoquinone monoimine in buffered alkaline medium as spray reagent. Benzene-n-hexane (50:50) was used to separate diheptyl- and dioctyldiphenylamines. The active agents of several imprecisely defined products were identified and the relationships between some mixtures were elucidated. The method highlights the numerous minor components of these very impure industrial compounds. Some theoretical correlations between the chemical structures, the RF values and the colours of the spots were also established.
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In vitro human oral bioaccessibility assessment of hazardous chemicals, including N, N'-substituted-p-phenylenediamines, coming from recycled tire crumb rubber.
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CRETUS, Department of Analytical Chemistry, Nutrition and Food Science, Universidade de Santiago de Compostela, E-15782, Spain. Electronic address:
Tires, apart from being formed by rubber and filling materials, contain organic compounds added to make them resistant and durable. The widely use of recycled tire crumb rubber (RTCR), main product of the shredding process of end-of-life tires, can cause human exposure to these chemicals due to its use in synthetic football fields and kid's playgrounds. In 2023, the European Commission banned the use of recycled tire crumb rubber in synthetic fields, giving eight years to replace the used material.
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College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310032, China. Electronic address:
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