standard samples, organic solvents, highly corrosive samples and scientific samples due to their extremely low blank value of metal elements and superior chemical properties.Because of the characteristics of no dissolution and precipitation, it is the cleanest laboratory analytical...
The corresponding starting material, or the quaternary o- or p-quinonmethides thereof, obtainable by splitting off Y4 H from said compounds of Formula III, in which at least one of R1 and R2 is hydrogen, e.g. with the use of strong mineral acids or alkalis, can be reduced either with...
Vorteilhaft wird der pH-Wert der erfindungsgemäßen Formulierungen im sauren bis sehr schwach alkalischen Bereich kleiner als 8 eingestellt, bevorzugt von 4,0 - 7,5 , besonders bevorzugt von 5,0 - 6,5. Die jeweils einzusetzenden Mengen an Hilfs- Zusatz- und Trägerstoffen und...
Bases and Alkalis 2SO4; Nitric, HNO3). However, not all compounds that contain Hydrogen are acids (Water, H2O; Methane, CH4). Acids are usually compounds of non metals with Hydrogen and sometimes Oxygen. O) ---> H+- HNO3--- (H2O) ---> H+3- Sulphuric, Hydrochloric and Nitric acids...