As seen from Table 1, for Acidithiobacillus
ferrooxidans ATCC 23270, it needed about 4 d when the
solution potential was up to about 600 mV in 10 mg/L
fluorine medium, while it needed only 1 d after the first
domestication. It is indicated that the tolerance of
Acidithiobacillus ferrooxidans ATCC 23270 to fluorine
could be obviously improved by adaptation for a long
time. At last, a strain (i.e. Frs) was obtained, which could
resist fluorine up to 40 mg/L.