Tea consumption has increased due to its beneficial effects. Results from a lab study on the effect of sucrose (5 g per cup, 150 mL) and/or ascorbic acid (2 mL per cup, 150 mL) on dissolved aluminum compounds during t...Tea consumption has increased due to its beneficial effects. Results from a lab study on the effect of sucrose (5 g per cup, 150 mL) and/or ascorbic acid (2 mL per cup, 150 mL) on dissolved aluminum compounds during the infusion of two commercial types of dry tea leaves (black, green) with boiling water (5, 15 min infusion time) are presented. Factors influencing the presence of dissolved aluminum in the infusions of both tea leaves were infusion time and sugar contents, as well as the interaction between ascorbic acid and sucrose (p < 0.05). Aluminum contents found after 15 min of infusion were 0.7 mg L–1 for black tea infusions added with sugar, and 0.69 mg L–1 for green tea added with both sugar and ascorbic acid. Both concentrations are higher than the level accepted in Mexico for drinking water (there is no act concerning tea infusions), that is 0.2 mg L–1.展开更多
The effects of rare earth (RE) alloys on the refining and modifying of cast aluminum alloys were investigated. Compared to other substances in common use, rare earth alloys maintain the refining and modifying effect...The effects of rare earth (RE) alloys on the refining and modifying of cast aluminum alloys were investigated. Compared to other substances in common use, rare earth alloys maintain the refining and modifying effects of the aluminum alloys for a longer time. RE alloys can also reduce environmental pollution in the melting process. These effects of RE alloys make them become a superior choice for the applications in aluminum foundry.展开更多
文摘Tea consumption has increased due to its beneficial effects. Results from a lab study on the effect of sucrose (5 g per cup, 150 mL) and/or ascorbic acid (2 mL per cup, 150 mL) on dissolved aluminum compounds during the infusion of two commercial types of dry tea leaves (black, green) with boiling water (5, 15 min infusion time) are presented. Factors influencing the presence of dissolved aluminum in the infusions of both tea leaves were infusion time and sugar contents, as well as the interaction between ascorbic acid and sucrose (p < 0.05). Aluminum contents found after 15 min of infusion were 0.7 mg L–1 for black tea infusions added with sugar, and 0.69 mg L–1 for green tea added with both sugar and ascorbic acid. Both concentrations are higher than the level accepted in Mexico for drinking water (there is no act concerning tea infusions), that is 0.2 mg L–1.
文摘The effects of rare earth (RE) alloys on the refining and modifying of cast aluminum alloys were investigated. Compared to other substances in common use, rare earth alloys maintain the refining and modifying effects of the aluminum alloys for a longer time. RE alloys can also reduce environmental pollution in the melting process. These effects of RE alloys make them become a superior choice for the applications in aluminum foundry.
