A luminum 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.Chemilum inescent(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-Bperistaltic 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 IBMcompatible 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 KMnO

4

H

2

SO

4

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.