Vapor generation system using nebulous phase reaction for the FAAS determination of copper

摘要

A new method of vapor generation using nebulous phase reaction was explored for the determination of copper by flame atomic absorption spectrometry (FAAS) with a homemade vapor generator. The sample solution was aspirated and sprayed into the reaction tube through a capillary tube, and NaBH4 solution was introduced by a peristaltic pump, then carried by pressurized air into the reaction tube. The aerosol of the sample and NaBH4 were mixed and reacted in the reaction tube in a nebulous state. After gas-liquid separating, the volatile copper species was transported directly into the atomizer by carrier gas. The effects of several experimental parameters of the proposed system were optimized, and the influence of 12 diverse interfering ions on the Cu determination was investigated. Three methods were used to confirm the volatile copper species. A detection limit of 6 mug/L (n=11) was obtained under the optimized conditions, and the precision of the measurements (RSD) for 0.3 mg/L Cu was 2.1%. The method was applied to the determination of copper in wastewater samples and recoveries of 93-105% (n=3) were achieved. were mixed and reacted in the reaction tube in a nebulous state. After gas-liquid separating, the volatile copper species was transported directly into the atomizer by carrier gas. The effects of several experimental parameters of the proposed system were optimized, and the influence of 12 diverse interfering ions on the Cu determination was investigated. Three methods were used to confirm the volatile copper species. A detection limit of 6 mug/L (n=11) was obtained under the optimized conditions, and the precision of the measurements (RSD) for 0.3 mg/L Cu was 2.1%. The method was applied to the determination of copper in wastewater samples and recoveries of 93-105% (n=3) were achieved. [References: 12]