date        time       tracer              chlorid          sodium         inorganic_carbon    iron_II    manganese_II
01.01.2001  00:00         0                  0                0                0                0             0
02.01.2001  00:00         0                  0                0                0                0             0
01.02.2001  12:00:00.0    0                  0                0                0                0             0
02.02.2001  12:00:00.0    0                  0                0                0                0             0
31.12.2001  00:00:00.0    0                  0                0                0                0             0