制备了中孔分子筛P123-SH,并对其用于吸附银离子的条件进行了探索.试验发现在温度为(20±1) ℃,介质pH值为3.6时,振荡吸附10 min,吸附容量为15.97 mg·g-1,吸附率可达98.5%.吸附在中孔分子筛P123-SH上的银离子可用0.2 mol·L-1盐酸-0.1 mol·L-1硫脲溶液5 mL完全洗脱回收,用火焰原子吸收光谱法测定洗脱液中痕量银的含量.银的质量浓度在0.008~0.24 mg·L-1范围内与其吸光度呈线性关系,方法的检出限(3σ)为0.64 μg·L-1.方法用于礼花弹样品中银含量的测定,加标回收率在97.5%~115.0%之间,相对标准偏差(n=7)为2.4%.

The mesoporous molecular sieve P123-SH was prepared,and the condition for adsorption of Ag+-ion was studied.It was found that in an aqueous medium of pH 3.6,the mesoporous molecular sieve P123-SH behaved to adsorb Ag+-ion strongly and equilibrium of adsorption was achieved by shaking for 10 min at the temperature of (20±1) ℃,and the adsorptive capacity of Ag+-ion at equilibrium was 15.97 mg·g-1,giving the adsorption rate of 98.5%.The Ag+-ion adsorbed on the surface of mesoporous molecular sieve P123-SH was completly desorbed with 5 mL of a mixed solution of 0.2 mol·L-1 HCl and 0.1 mol·L-1 thiourea,and the silver content was determined by FAAS.Linear relationship between values of absorbance and mass concentration of Ag+-ion was obtained in the range of 0.008-0.24 mg·L-1,with detection limit (3σ) of 0.64 μg·L-1.The proposed method was applied to the determination of silver in firework,giving values of recovery in the range of 97.5%-115.0% and RSD (n=7) 2.4%.