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以甲醛为交联剂,以三聚氰胺、三乙烯四胺为原料合成了一种新型的三聚氰胺-甲醛-三乙烯四胺(MF-TETA)分离树脂,研究了MF-TETA分离树脂对痕量银的分离富集性能,探讨了MF-TETA分离树脂对银的吸附原理与最佳条件。在pH6.0、温度为35℃的条件下,试液中的银可被MF-TETA树脂定量吸附,其静态饱和吸附容量为32 mg/g,吸附在树脂上的银可用10 mL0.05 mol/L HNO3完全洗脱,洗脱液中的银用火焰原子吸收光谱法(FAAS)测定。该法对银的检出限为16 ng/mL(3σ,n=11),线性范围为0.05~5mg/mL,RSD=2.2%,回收率在95.8%~102.0%之间,方法可用于中草药中痕量银的测定。
A novel melamine-formaldehyde-triethylenetetramine (MF-TETA) resin was synthesized by using formaldehyde as the crosslinking agent and melamine and triethylenetetramine as raw materials. The effects of MF-TETA resin on the trace silver Separation and enrichment performance, discuss the MF-TETA resin separation of silver adsorption principle and the best conditions. Under the conditions of pH6.0 and temperature of 35 ℃, the silver in the test solution can be quantitatively adsorbed by MF-TETA resin with a static saturated adsorption capacity of 32 mg / g. The silver adsorbed on the resin can be diluted with 10 mL of 0.05 mol / L HNO3 completely eluted, silver in the eluate was determined by flame atomic absorption spectrometry (FAAS). The detection limit of silver was 16 ng / mL (3σ, n = 11). The linear range was 0.05-5 mg / mL, RSD was 2.2%. The recoveries ranged from 95.8% to 102.0% Determination of trace silver.