A comparison of plasma-treated tap water (PTW) with two classically acidified waters (CAW) was conducted using hydrochloric acid and nitric acid (Th. Geyer GmbH & Co. KG, Renningen, Germany), respectively. This comparison serves two purposes; firstly, to visualize possible effects of PTW induced through plasma treatment other than mere acidification. Secondly, to discover possible influences of the respective salt of the acid in action. The pH values of the acidified water samples were adjusted according to the pH value of the produced PTW of ≈1.8. To avoid any side effects of possible tap water constituents the CAW were prepared using deionized water, using a Smart2Pure 3 UV/UF water purification system (Thermo Scientific, Barnstead, Waltham, MA, USA).
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