摘要
以１亚硝基２萘酚为萃取剂，以９０℃熔融萘作稀释剂萃取痕量钯（Ⅱ），萘相中钯经氯仿溶解后用光度法测定其含量。实验条件下络合物能从ｐＨ＝０．８～１１０范围内定量萃入萘中，络合物波长λｍａｘ＝４４０ｎｍ，摩尔吸光系数ε４４０＝２４１×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，组成比Ｐｄ∶ＨＲ＝１∶２，萃取反应平衡常数Ｋｅｘ＝６３１×１０１１。钯量在０４８～３４μｇ／１０ｍｌ范围内符合朗伯比耳定律，检测限为００４４μｇ／１０ｍｌ。同时确定了光度法测定的最佳条件及常见阴阳离子的干扰允许量。利用该法进行合成样与实际样中钯含量的测定，结果满意。
After trace amount of Pd(Ⅱ) was extracted with 1 nitroso 2 naphthol as extractant and naphthalene as diluent at 90℃, the content of Pd(Ⅱ) in naphthalene (organic phase) was determined by spectrophotometry. Under the experimental conditions, the complex of Pd(Ⅱ) with 1 nitroso 2 naphthol can be extracted quantitatively into naphthalene in range of pH=0 8～11 0 after solidified naphthalene was dissolved in CHCl 3and the absorbance was determined at 440 nm. Lambert Beer law is obeyed between 0.48～34 μg Pd(Ⅱ)/10.0 ml. Apparent absorbtivity ε 440 =2.41×10 4 L·mol -1 ·cm -1 and detection limit is 0.044 μg/10.0 ml. Tolerance limits of common anion and cation ion were also tested. The procedure was used successfully to determine Pd(Ⅱ) in synthesized samples. The composition of coordination compounds and the equilibrium extraction constant K ex were also given.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
1998年第5期350-354,共5页
Chinese Journal of Rare Metals
基金
甘肃省自然科学基金
关键词
固-液萃取光度法
钯
1-亚硝基-2-萘酚
Solid liquid extraction spectrophotometry, Palladium, 1 nitroso 2 naphthol
