Determination of volatile phenol in sediment by flow injection analyzer with alkali solution extraction
It is of great significance for ecological environment protection to determine accurately and effi-ciently volatile phenol content in sediment.The liquid-solid ratio was controlled at 15∶1.Volatile phenol in the sample was extracted with 10 g/L sodium hydroxide solution after oscillation at 180 r/min for 15 min.Meanwhile,3.0 g of copper sulfate was added to remove the interference of sulfides in the sample.Thus,the determination of volatile phenol in sediment was realized by flow injection analyzer.The results showed that the mass concentration of volatile phenol in range of 0.02-1.0 mg/L exhibited linear relation-ship to its corresponding peak area with correlation coefficient of 0.999 9.The limit of detection and lower limit of determination for this method were 0.08 mg/kg and 0.32 mg/kg,respectively.Three sediment samples with different concentrations of volatile phenol content in sediment were determined according to the proposed method,and the relative standard deviations(RSD,n=6)of determination results were be-tween 0.83％and 1.4％.Two types of sediment sample were selected for recovery tests with three content levels,respectively.The recoveries were between 93％and 104％.The contents of volatile phenol in six sediment samples were determined according to the proposed method as well as 4-ampyrone spectropho-tometry in standard method of HJ 998-2018.The results of the two above methods were basically consist-ent.
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