FI-CV-AFS Determination of Trace Amount of Mercury in Environmental Water After Enrichment with Cation Exchange Resin

Trace amount of mercury in environmental water were enriched by cation exchange resin, and determined by FI-CV-AFS. Preparation of the cation exchange column and analytical conditions, including time of enrichment, pH of the sample solution and the eluant, etc. were studied and optimized. Linear relationship between the fluorescence intensity and mass concentration of mercury found was in the range within 40 ng·L-1, with detection limit (3s) of 0.13 ng·L-1. The proposed method was applied to the analysis of samples of environmental water. Using these samples as matrixes, tests for recovery were made by standard addition method; values of recovery found were in the range of 72.5%-101.3%.