【摘要】 发现L-乳酸铝对纳米金-酸性高锰酸钾体系化学发光的增强作用,其增强化学发光强度的能力与高锰酸钾及溶液的介质硫酸浓度、金浓度以及蠕动泵的转速、流动注射化学反应体系的流路设计等因素有关,在此基础上首次建立了测定L-乳酸铝的增强化学发光分析法。测定L-乳酸铝的线性范围为7.0×10-5～1.0×10-2g.mL-1,检出限为1.04×10-6g.mL-1(S/N=3),对8.0×10-4g.mL-1的L-乳酸铝标准溶液进行11次平行测定,相对标准偏差(RSD)为1.48%。该法直接用于L-乳酸铝制备合成反应液以及分离纯化废液中L-乳酸铝的测定,其回收率为95.8%～100.4%,本法与GB/T6987.8-2001法进行了对照,结果令人满意。探讨了该化学发光增强作用是由于L-乳酸铝注入体系后,加速了纳米金与酸性高锰酸钾的反应所致。更多还原

【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.更多还原