摘要
在1mol/L盐酸溶液中,当氯化亚锡存在时,用双硫腙溶液同时萃取铂和钯,双波长系数倍率法测定。测定铂时,λ_1为600nm、λ_2为710nm,K=7,测定钯时,λ_1为720nm。λ_2为638nm,K=3.5。铂和钯均在0～1.0μg/ml浓度范围内符合比尔定律,表观摩尔吸光系数分别为2.01×10~5L·mol^(-1)·cm^(-1)和1.10×10~5L·mol^(-1)·cm^(-1)。本文还探讨了氯化亚锡在萃取反应中的作用机理。方法简便、选择性好,用于地质样品中痕量铂和钯的测定,可获得满意的结果。
Pt and Pd are all extracted with CCl_4 solution of dithizone in the presence of SnCl_2 in 1 mol/L HCl solution, and determined by the dual-wavelength technique with K-factor method. For determining Pt, reference wavelength λ_1 is 600 nm, measured wavelength λ_2 is 710 nm, K is 7, and for Pd, λ_1 is 720 nm, λ_2 is 638 nm, K is 3.5. The calibration graph is linear in the range of 0～1.0μg/ml for Pt and Pd, the apparent molar absorptivity is 2.01×10~5 and 1.10×10~5 L·mol^(-1)·cm^(-1), respectively. The function of SnCl_2 in the process of extraction is also discussed. The methodis simple, convenient and useable, and has been applied to the determination of trace Pt and Pd in geological sample with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1992年第7期774-778,共5页
Chinese Journal of Analytical Chemistry
关键词
双硫腙
萃取
铂
钯
双波长光度法
Dual-wavelength spectrophotometry
K-Factor
Dithizonc
,Extraction
Platinum
Palladium.
