浊点萃取-火焰原子吸收光谱法测定乙醛触媒微量钯含量

摘要

建立了以1-(2-吡啶偶氮)-2-萘酚(PAN)为络合剂,以非离子表面活性剂Triton X-100为萃取剂的浊点萃取分离富集-火焰原子吸收光谱法测定痕量钯的新方法.研究了溶液的酸度、络合剂和表面活性剂浓度、平衡温度和时间、离子强度等条件对浊点萃取效果的影响.该方法对钯的检出限为35.3 ng/mL,相对标准偏差(RSD)为3.1％(n=8),回收率97.6％～106.7％.可用于乙醛催化剂中微量Pd(Ⅱ)的测定.%Deter mination of micro Pd ( Ⅱ) in aldehyde catalyst was established by cloud point extraction separation-flame atomic absorption spectrometry using l-(2-pyridylazo)-2-naphthol(PAN) com-plexing agent( Ⅰ ) , non-ionic surfactant Triton X -100 as extracting agent (Id). The influences of acidity of solution,concentration of I and Ⅲ temperature and time of equilibrium,and ionic strength on the effect of cloud point extraction separation were investigated. The detection limit of new determinating method is 35. 3 ng/mL, the RSD is 3. l%(n = 8),the recovery is 97. 6%~106. 7%. New methd can be used in aldehyde production.