Migration Behavior of Tin in Tin Tea Pots

The migration behavior of tin in two types of tin tea pots with the different mass fractions of tin of 99% (for samples of 1^#-5^#) and 97% (for samples of 6^#-10^#, containing heavy metal impurities of copper and antimony) was researched by ICP-AES. The samples were soaked in 3 types of simulated solution artificial tap water, 50% (volume fraction, the same below) ethanol solution, 5, 10 g·L^-1 citric acid solution for different times at 3 migration temperatures of 25, 40, 70 ℃, and the content of tin in soaking solution was determined by ICP-AES. Samples of 1^#-3^# and 6^#-8^# were soaked in artificial tap water at 40 ℃ for 8, 24, 72 h to investigate the migration behavior of tin in artificial tap water; samples of 4^#, 5^#, 9^# and 10^# were soaked in 50% ethanol solution at 40 ℃ for 8, 24, 72 h to investigate the migration behavior of tin in 50% ethanol solution; samples of 1^#-3^# and 6^#-8^# were soaked in 5, 10 g·L^-1 citric acid solution at room temperature for 10, 20, 30, 120, 180, 240, 300, 360, 480, 720, 1 440 min to investigate the repeatability of tin's migration in acidic solution; samples of 1^# and 6^# were soaked in 10 g·L^-1 citric acid solution at 25, 40, 70 ℃ for 240 min to investigate the effect of temperature on the migration behavior of tin in acid solution. The results showed that, ① the migration of tin in artificial tap water was less than 2.0 mg·kg^-1; and the migration process was a weak process of ion exchange, with the main influencing factors of migration of time and metal impurities; ② tin was kept relatively stable in 50% ethanol solution, and its migration amount was negligible; ③ the migration amount of tin was high in citric acid solution, with the highest mass fraction of 215.70 mg·kg^-1, and the migration process was an exchange process of strong corrosion-resistant ions, with its main influencing factors of the acidity of the simulated solution, migration time, metal impurities and migration temperature.