The trend of global under-five child mortality rate showed a steady decrease at -3.14% per year approaching the United Nations millennium development goals target (-4.0% reduction per year from 1990-2015). This rate is usually inversely proportional to the nations GDP. However, the progress in the recent years (2006-2012) in Malaysia has raised a disturbing concern with an annual average increment of +0.81% per year. Thus, there is an urgent need to identify the reasons of such risky ecosystem. By analyzing recorded data on river pollution from 2007- 2012, we found that river pollution has high correlation with the gross domestic products, not at the same year, but for two years prior that indicates a lag time. We also found that under-five child mortality has strong correlation with the river pollutions. The development-pollution health triangular cycle needs to be put in a balanced to ensure the nation prosperity andsustainability of the nation.
A naked-eye colorimetric sensor for mercury ions detection was developed. The colour change due to the presence of Hg2+ can be easily distinguished using an app via a smartphone. Thus, without resorting to any expensive instruments that are mostly laboratory bound, Hg2+ can be easily detected at IC50 value of 0.29 ppm. This is a promising alternative and practical method to detect Hg2+ in the environment.
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