Rapid Detection of Trace Amount 2-Naphthol in Tapwater by Membrane Enrichment-UV Spectrometry

KeyWord:membrane enrichment  solid phase UV spectrometry  2-naphthol  water

Abstract:

      A rapid,sensitive method based on membrane enrichment-solid phase UV spectrometry for the determination of 2-naphthol in tapwater was developed.The enrichment material is nylon membrane£¨pore size:0.22 ¦Ìm£©.UV spectrum of 2-naphthol was acquired after enrichment without further treatment for quantitative analysis.The method is rapid and sensitive.The influences of pH value,sample volume,and vacuum degree were optimized,and the analysis capacity was evaluated.The result showed that there is a quadratic relationship between UV absorbance£¨wavelength:331 nm£© and concentration of 2-naphthol in the range of 0.3-10 mg/L.There are two linear relationships in the ranges of 0.3-1.0 mg/L and 1.0-10 mg/L with correlation coefficients of 0.999 1 and 0.995 5,respectively.Under the optimum conditions,the limit of detection£¨LOD£© was 0.265 6 mg/L.The accuracy and precision of the method are satisfactory,which could be used for the detection of 2-naphthol in tapwater.