[Accumulation and excretion of fluorine and effect of selenium on them in rats with chronic fluorosis].

2 groups of Wistar rats with chronic fluorosis were duplicated with 30 and 50 mg/L fluorine (F) in drinking water. 2. 0 mg/kg selenium (Se) in fodder was supplemented in the other 2 groups of rats with fluorosis. The amount of drinking water and diet, the excretion of urine and the contents of urine F were tendentiously surveyed every month in one year and then, intake and excretion of F were calculated per day. The contents of Se in urine, liver and serum and F in bone, liver, kidney and serum were measured in the 4th, 8th, and 14th month. The results showed that F absorption increased and F excretion/F absorption rate decreased in 2 groups of rats with fluorosis compared with control group and there were positive correlations between concentration of urine F and water F, as well as concentration of F urine and time of drinking F water. The accumulation of F in bone and liver occurred in the middle period of fluorosis and then, the increase of serum F was observed in the late period of fluorosis in 2 groups of rats with fluorosis. After supplement of Se, urine, liver and serum Se ascended. At the same time, state of eating and drinking improved, the weight rose and the amount of urine excretion heightened, as well as there was an increase of urine F and excretion F/absorption F rate and there was a decrease of bone, live, kidney and serum F in rat of Se supplementation with fluorosis compared with non-Se groups.