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[Evaluation of exposure to fluorine compounds in aluminum metallurgy].

concentrations of hydrogen fluoride and fluorides were determined near pots with a vertical pin Söderberg anodes and near the prototype pot with a prebaked anode. Samples were collected by the stationary method and with personal samplers (Casella) where the membrane filter was connected with the bubbler filled with 0.1 M NaOH. Hydrogen fluoride and fluorides were determined by colorimetric and potentiometric methods. Altogether 300 samples were determined. Fluorides concentrations near pots with Söderberg anodes ranged between 1.42-2.43 mg/m3 (P = 95), geometric mean being 1.86 mg/m3 (with stationary and personal samples). The range of hydrogen fluoride concentrations was 1.28-3.08 mg/m3 (P = 95), whereas geometric mean--1.99 mg/m3 (personal samples). Hydrogen fluoride concentrations in stationary samples were lower (geometric mean--1.47 mg/m3). Fluorides concentrations during the tests with the prototype pot (prebaked anode) were five times lower, as compared to fluorides concentrations near the traditional pots.

Aluminum↗

[Phospholipid composition of membrane lipids of hepatic subcellular structures in rats under the effects of different nutrition and phosphorus and fluorine compounds].

A study was made of the phospholipid composition of the membranes of the rat liver nucleus, mitochondria and microsomes under the effect of different nutrition, hydrogen fluoride and phosphine. It was established that prolonged exposure to hydrogen fluoride and phosphine resulted in alterations of the phospholipid composition of the membranes of the liver nucleus, mitochondria and microsomes. The pattern of nutrition, the diet content of retinol, tocopherol, ascorbic acid and essential amino acids (lysine, methionine, threonine) determined not only the quantitative and qualitative composition of phospholipids but also the action of the foreign substances under study on the cell membranes. The enrichment of the diet with retinol, tocopherol, ascorbic acid and thiamine reduced the membrane-damaging action of hydrogen fluoride and phosphine.

Animals↗