Study On New Methods For Determination Of Trace Phenol And Anionic Surfactant

The Phenol and Anionic surfactants are two kinds of important raw materials. Phenol is highly toxic,and the aggregation of Anionic surfactants in environmental water cause an deterioration of water quality,which will do harm to aquatic organisms.The harm of these two organic compounds to health are extremely serious,Therefore the determination of phenol and anionic surfactants in environment is of importance.This study is on the basis of spectrophotometry:①A method of measuring the contents of phenols in water by using a modified 4 - AAP spectrophotometry is reported in this paper,which is based on a homemade micro fiber spectrometer;②Objective to establish a method for direct spectrophotometric determination of phenol in aqueous phase;③To set a preparation of a new nanoparticle and establish a method of measuring the contents of Anionic surfactants which is based on the optical properties of the nanoparticle. It improves the traditional determination methods,enables the method pocesses the advantage of measuring apparatus used is simple and good precision and accuracy,and is also easy to be manipulated.A method of measuring the contents of phenol in water by using a modified 4 - AAP spectrophotometry is reported in this paper,which is based on a homemade micro fiber spectrometer. In this paper,the amount of chloroform and sample are decreased,eliminating the filtration stage,it is possible to make a quantitative extraction by displacing the transfer equilibrium of the red indolol-antipyrine dye towards the organic phase,thus the substance in a sample is determined by means of measuring the absorbance of organic phase. Under the optimal experimental conditions,the linear ranges of determination is 0.01～0.5 mg/L for phenol. And the limit of detection is 0.004 mg/L. The relative standard deviation (RSD) is less than 2.40% for phenol,and the range of recovery is 94%-101%. The results showed that this method is of good precision and accuracy,and is also easy to be manipulated and can be employed for online monitor.A simple,rapid spectrophotometric method for the determination of Phenol was proposed. This method is based on the Berthelot reaction occurred between phenol and sodium nitroprusside in the presence of hydroxylamine hydrochloride,to produce a indophenol dye,thus the phenol in water was determined photometrically. To achieve the optimum reaction performance,several main parameters including pH,amount of Na2HPO4-NaOH buffer,sodium nitroprusside and hydroxylamine hydrochloride, reaction time,were investigated. Under the optimized experimental conditions,the linear ranges of determination are 0.05～0.5mg/L(r=0.9996). And the limits of detection is 0.005mg/L,the relative standard deviation (RSD,n=5) is 1.32% for 0.3mg/L phenol. The results showed that this method is of good precision and accuracy,and is also easy to be manipulated and can be employed for online monitoring.The nanoparticle PAn@AuNPs has been successfully synthesized by in-situ dispersion polymerization. The nanoparticle is positively charged with electricity on surface. So the nanoparticle can be used to determine anionic surfactant as a kind of probe. The results of which show: under the conditions that pH value is 6,free anionic surfactant moleculars may become to attached to the surfaces of positively charged PAn@AuNPs,which results in aggregation of the nanoparticles,owing to electrostatic interactions. With this method,the detection of SDS can be successfully performed in the concentration range 0.1～2 mg/L,and RSD of 2.77% and 1.38% for 5 replicates of 0.5 mg/L and 1.0mg/L phenol solution,respectively,which provide us a novel method of the determination of Anionic Surfactant.