[Preconcentration of trace Pd (II) on crosslinked chitosan and determination by graphite furnace atomic absorption spectrometry].
A novel crosslinked chitosan(CCTS) not dissolved in acidic or alkaline solutions was synthesized by the crosslinking reaction of chitosan (CTS) with crosslinking agent (3-chloro-1,2-epoxypropane). The adsorption capability of Pd(II ) by CCTS was studied at different pH value. The results showed that the adsorption efficiency was above 98% after preconcentration for 20 minutes when pH values were 1-4. The effects of preconcentration time, dosage of CCTS, adsorption capacity of CCTS, sample volume, coexistent elements, and elution of Pd(II) were investigated. The mechanism of adsorption of CCTS for Pd(II) was discussed. A novel method for the preconcentration and separation of trace Pd(II) with crosslinked chitosan (CCTS) and its determination in water by graphite furnace atomic absorption spectrometry has been developed. The detection limit (3sigma, n=8) was 0.143 microg x L(-1), the relative standard deviation(RSD) was less than 5.47%, and this preconcentration method was used to detect Pd(II) in lake water and sea water with recoveries of 92%-96%. It also can be used to recycle Pd(II).
Qian
Sha-hua
SH
College of Resource and Environmental Science, Wuhan University, Wuhan 430079, China.
Xiang
Luo-jing
LJ
Deng
Hong-bing
HB
Xiao
Mei
M
Lin
Han
H
Li
Xue-qin
XQ
D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
D003432:Cross-Linking Reagents; D007854:Lead; D006108:Graphite; D048271:Chitosan