Medium | Concentration | temperature ºC | performance | |
HCI | 5-20% | boiling point | good | |
H2SO40 | 30%(70-100%) | boiling point(180, 240ºC) | better(not good) | |
HNO3 | 5-50%(100%) | 100 | ºC(150) ºC | better(not good) |
H2CRO4 | full concentration | 100 | ºC | better |
H3PO4 | 10-20(10-60) | boiling point(100 ºC) | better |