摘要
在酸性介质中钯（Ⅱ）对Ⅴ（Ⅴ）－Ｍｎ（Ⅱ）－Ｔｗｅｅｎ－２０－ＤＡｍＨＭ体系显色反应有阻抑作 用，基于此建立了一种测定钯的动力学分析方法，并研究了该阻抑反应的动力学参数。方法 的线性范围为２０～２４０μｇ Ｐｄ（Ⅱ）／Ｌ，检测限为８．４×１０－９ｇＰｄ（Ⅱ）／ｍＬ。该体系灵敏度高，稳 定性好，用于石钯渣和钯催化剂中把（Ⅱ）的测定，结果满意。
In acidic medium the palladium(Ⅱ) inhibits the rate of colour reaction system in Ⅴ(Ⅴ)-Mm (Ⅱ)-Tween 20-Diantipyryl-(m-hydroxy)-phenylmethane(DAmHM). The kinetic parameters of the inhibited reaction are studied. The apparent rate constant is 3. 37 ×10-2 min- 1 and energy of activation is 107. 1 kJ/mol. On the base of such an inhibition, a kinetic spectrophotometry for the determination of trace palladium (Ⅱ ) is extablished. The detection limit is 8. 4 × 10-9 g/mL for Pd(Ⅱ). Palladium (Ⅱ) can be determinated accurately in the range of 20 - 240μg/L. This method has high sensitivity and good stability. It is applied to the determination of palladium(Ⅱ) in samples of palladium-catalyst and lithopalladium dross with astisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1998年第9期1112-1114,共3页
Chinese Journal of Analytical Chemistry
关键词
分光光度法
阻抑作用
钯
钒
DAmHM
测定
Diantipryl-(m - hydroxy ) -phenylmethane
kinetic - spectrophotometry
inhibition
palladium (Ⅱ)
vanadium(Ⅴ)
