Sun Yu-yang
2008
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Journal
Chinese Journal of Luminescence
Abstract
Aluminum lactate has been gradually and widely used as important reagents and raw chemical material in various fields,such as daily chemical industry,industrial production,medicine,and life sciences,etc.Thus the amount of aluminum lactate production increases,therefore,it is of great importance to monitor aluminum lactate.The published analytical methods for Al determination can be categorized two kinds.One is the direct method and the other the derivatization-based method.The former methods include atomic absorption spectrometry,and inductive coupled plasma atomic emission spectrometry(ICP-AES),and the latter do spectrophotometry,resonance Rayleigh scattering(RRS) and fluorescence.Chemiluminescent(CL) methods have characteristic rapid assays,and good reproduction with simple instruments(no monochromator required),etc.However,there are few literatures in which Al was measured by CL method.It is a little cockamamie to use the indirect CL analysis such as aluminium chelates form and coupling reaction.Though the latest literatures directly on CL analysis of luminol system,the usage of it,are still limited because luminol is the CL reagent in alkaline solution.In an acidic medium,direct CL analysis of Al without derivatization has not been reported in the literature.In this work,the feasibility of direct dermination of acidic Al using flow injection CL system was studied for the first time,the kinetic curves of aluminum L-lactate-gold nanoparticles-acid potassium-permanganate,aluminum L-lactate-gold nanoparticles and aluminum L-lactate-acid potassium-permanganate systems were investigated.The CL signal was detected with a flow injection chemiluminescence system(Xian Ruimai Electronic Technology Co.,Ltd.,China)consisting of a model MPI-B peristaltic pump,a mixing tee,a model MPI-B CL detector equipped with a glass coil(used as reaction coil and detection cell),a photomultiplier,and IBM compatible microcomputer.it was found that aluminum L-lactate enhanced strongly the CL of gold nanoparticles-acid potassium-permanganate system.The activities of enhancement were related to the concentration of KMnO4,H2SO4 and Au,the pump speed and the channel of the flow injection CL system.On this basis,a novel flow injection method with enhanced chemiluminescent detection was deve-loped.It allows the detection of aluminum L-lactate in the range of 7.0×10-5~1.0×10-2 g·mL-1 with a detection limit of 1.04×10-6 g·mL-1(S/N = 3).The relative standard deviation is 1.48% for the determination of 8.0×10-4 g·mL-1 aluminum L-lactate(n=11).The method has been successfully used to determine aluminum L-lactate contents in synthetical solutions and separate wastewaters with the recoveries of 95.8%~100.4% and the results obtained by this method were comparable with that by GB/T 6987.8-2001(National Standard of P.R.China).Finally,the CL kinetic curves and UV-visible absorption specta were studies and the CL enhancement mechanism has been proposed due to the quickened the reaction of aluminum L-lactate with gold nanoparticles and acid potassium-permanganate.