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Balogun Ayo F.,Baba Alafara A.,Olaoluwa Daud T. 한국자원공학회 2023 Geosystem engineering Vol.26 No.6
Research was carried out to investigate the use of tributylphosphate (TBP) and enhanced β-diketones for extracting copper from covellite ore leach liquor. The effect of some parameters such as contact time, temperature, phase ratio, equilibrium pH, and extractant concentration on the extent of copper extraction was examined. For the following conditions: temperature 27 ± 2°C, phase ratio 1:1, extraction efficiency of 95.30% total copper was achieved using a mixture of 0.25 mol/L enhanced β-diketones + 0.10 mol/L TBP in kerosene within 15 minutes at pH of 7.8. Furthermore, the stripping of approximately 97.3% of pure copper from the loaded organic phase was successfully attained at optimal conditions. The hydrometallurgical flow chart summarizing the analytical operations for the extraction and recovery process was provided.
Use of Mobile Phones and Cancer Risk
Ayanda, Olushola S.,Baba, Alafara A.,Ayanda, Omolola T. Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.1
Mobile phones work by transmitting and receiving radio frequency microwave radiation. The radio frequency (RF) emitted by mobile phones is stronger than FM radio signal which are known to cause cancer. Though research and evidence available on the risk of cancer by mobile phones does not provide a clear and direct support that mobile phones cause cancers. Evidence does not also support an association between exposure to radio frequency and microwave radiation from mobile phones and direct effects on health. It is however clear that lack of available evidence of cancer as regards the use of mobile phone should not be interpreted as proof of absence of cancer risk, so that excessive use of mobile phones should be taken very seriously and with caution to prevent cancer.