[An epidemiological survey of malignant tumors among fluoride-exposed workers in aluminum industry].

Objective: To investigate the incidence of malignant tumors among fluoride-exposed workers in aluminum industry.

Methods: Sampling points were set in the working positions at different radii around an workshop for treating the waste gas from aluminum electrolysis, and the concentrations of fluoride ions, aluminum, and benzo[a]pyrene (B[a]P) in air were measured by electrode method, atomic absorption spectrophotometry, and high performance liquid chromatography, respectively. The incidence of tumors among the workers in the aluminum plant from 1995 to 2009 was investigated by questionnaires and medical records and then statistically analyzed.