The fluoride,chloride,sulfide and low melting point metal ions on the surface of nuclear power equipment may cause the corrosion failure of material surface,which directly affects the service life and op-eration safety of nuclear reactor system.Therefore,it is very important to detect the contents of F-,Cl-,Pb2+and SO4-on the surface of nuclear power equipment.In this paper,a new detection method,i.e.,wipe test method,for the quantitative determination of F-,Cl,Pb2+and SO2-on the surface of nuclear power equipment was established.This method included three steps:sample collection,sample treatment and sample analysis.The gauze after treatment in boiling water was used to wipe the surface of nuclear power equipment.The wiping area of each gauze was usually 20 dm2.The wiped and unwiped gauze sam-ples were put into beakers separately.After adding water,the beaker was heated to slight boiling at 90-100 ℃ for 30 min.Then the solution was filtrated with halide-free 0.45 pm filter paper,and the test sam-ple and the contrast sample were obtained.The contents of F-,Cl and SO2 were determined by ion chromatography(IC),while the content of Pb2 was determined by graphite furnace atomic absorption spectrometry(GF-AAS).Consequently,the content of each ion in unit area could be calculated,realizing the accurate determination of F-,Cl-,Pb2 and SO2-on the surface of nuclear power equipment.Under the optimized experimental conditions,the limit of detection of F-,Cl-,Pb2+and SO42-in this method was 0.01 μg/mL,0.02 μg/mL,0.05 μg/mL and 0.001 μg/mL,respectively.The contents of F-,Cl-,Pb2+and SO2-on the surface of stainless-steel welding layer were determined according to the experimen-tal method,and the relative standard deviations(RSD,n=6)of the determination results were between 3.6％and 5.3％.The standard solution of four irons were added into the sample solution for standard re-covery tests.The spiked recoveries were between 99％and 116％.
wipe testgauzenuclear power equipmentfluorinechlorinesulfateleadion chromatography(IC)graphite furnace atomic absorption spectrometry(GF-AAS)
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