by the Sefako Makgatho Health Sciences University in Pretoria towards the end of 2022.
Twelve commonly available brands of water were purchased and analysed for trace-metal content. Three of the samples had pH values in the acidic region below the permissible standard of 6.8–8.0 set by the International Bottled Water Association, meaning they were not fit for human consumption. The target hazard quotient calculated for the water samples showed a minimum risk for lead, chromium and nickel.
Information on the labels of some of the bottles did not match the chemical makeup of the water they contained, said the research team led by Professor Joshua Olowoyo.published in May 2022, the Pretoria researchers relied on evidence that in certain temperatures, chemicals have the potential to migrate from polyethylene terephthalate plastic bottles into the water as well as during recycling.
The researchers have called for producers to be monitored for compliance with WHO limits and that suppliers should makeThe subsequent review by Calie Adlem, a former CSRI quality manager, and John Weaver, who has a master’s degree in hydrology, claims to have found “numerous errors and probable incorrect data”, including the use of incorrect units of measure; a lack of clarity about what was being tested/reported; and a lack of interrogation of the results.
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