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    锡茶罐中锡的迁移行为分析

    Migration Behavior of Tin in Tin Tea Pots

    • 摘要: 用电感耦合等离子体原子发射光谱法(ICP-AES)研究2种不同锡含量的锡茶罐1#~5#和6#~10#中锡质量分数分别为99%和97%(含重金属杂质铜和锑)中锡的迁移行为。在3种迁移温度(25,40,70℃)下,将样品在3种模拟溶液人造自来水、50%(体积分数,下同)乙醇溶液、5,10 g·L-1柠檬酸溶液中浸泡不同时间,然后用ICP-AES测定浸泡液中锡的含量。在40℃下用人造自来水分别浸泡1#~3#和6#~8#样品8,24,72 h,以考察锡在人造自来水中的迁移行为;在40℃下用50%乙醇溶液浸泡4#、5#、9#、10#样品8,24,72 h,以考察锡在50%乙醇溶液中的迁移行为;在25℃下用5,10 g·L-1柠檬酸溶液浸泡1#~3#和6#~8#样品10,20,30,120,180,240,300,360,480,720,1 440 min,以考察锡在酸性溶液中的重复性迁移规律;在25,40,70℃下以10 g·L-1柠檬酸溶液浸泡1#和6#样品240 min,以考察温度对锡在酸性溶液中迁移行为的影响。结果表明:①在人造自来水中,锡的迁移量不大于2.0 mg·kg-1,迁移过程是一个较弱的离子交换的过程,影响迁移的主要因素为迁移时间和金属杂质;②锡在50%乙醇溶液中比较稳定,其迁移量可以忽略;③在柠檬酸溶液中,锡的迁移量较高,最高质量分数为215.70 mg·kg-1,该过程是一个强耐腐蚀离子交换过程,主要影响因素为模拟溶液酸度、迁移时间、金属杂质和迁移温度。

       

      Abstract: 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.

       

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