Abstract
Copper colloids were synthesized in ethylene glycol by using ascorbic acid(VC) as the reducing agent and polyvinyl pyrrolidone(PVP) as the dispersant.The as-prepared copper colloids were characterized by XRD,UV-Vis and resonance light scattering(RLS).Face-centered cubic Cu(0) particles were formed,which displayed resonance light scattering(RLS) spectra with a typical plasma resonance absorption within the range of 592~602 nm and the maximum scattering wavelength at 468 nm.The RLS results show that the favorable reaction conditions are in the addition order of VC,CuSO4 and PVP under n(VC)/n(Cu2+)=15,n(PVP-K30)/n(Cu2+)=1.4,temperature=60 ℃,and incubating for 1 h.The obtained copper colloids are stable for 24 h.Under such reaction conditions,the scattering intensity(ΔIRLS) is proportional to Cu2+ content in the range of 5.12~12.8 mg/L with the detection limit of 0.63 μg/L(3σ),and the regression equation is ΔI=7420.2ρ-631.8(r=0.9962).When the concentration of Cu2+ solution is 10 mg/L,the colloidal system is stable for 24 h.Foreign substances such as 0.64 mg/L MnSO4,CdSO4 and ZnSO4,1.28 mg/L of KI,64 mg/L of Na2CO3 and Ca(OH)2,960 mg/L CH3CH2OH,640 mg/L CH3OH and 320 mg/L CH3CH2CH2OH had no interference.Therefore,a simple method to detect the Cu2+ in ethylene glycol is established using the RLS spectra.
Published Version
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