RESUMO
After the heteropolymobdate of silicon and phosphorus was formed, the heteropolymobdate of phosphorus was extracted into CH3COOH4H9 phase and P as interference element was separated. The heteropolymobdate of silicon was extracted by MIBK. Indirect determination of Si was achieved with Mo in MIBK determined by FAAS. Applying this method to the determination of silicon in cobaltosic oxide, the interferences of matrix cobalt and other coexistence elements were avoided. Compared to spectrophotometric method, the result is satisfactory.
RESUMO
AIDS-related knowledge, attitude and behavior were studied in 1,058 servicemen in China with self-administered and anonymous questionnaires. Results showed 76.7% to 89.5% of the servicemen surveyed knew correctly the risk of AIDS and its route of transmission, but only 8.5% of them answered all the questions listed in the questionnaire correctly. Source of their knowledge about AIDS was mainly from newspapers, magazines and extracurricular books. Most of them thought they could have very little, or no chance to contract the illness. There were 74.0% of the servicemen eager to get knowledge about AIDS and 83.2% would like to accept relevant testing. And, 80.2% of them answered that they could put their behavior under control, or change their unhealthy one to prevent from the illness. It indicated that comprehensive and correct publicity and education could play an active role in the prevention of HIV infection.