1. 国家海洋局南海环境监测中心，广东 广州 510300 2. 仲恺农业工程学院轻工食品学院，广东 广州 510225 3. 同济大学化学系，上海 200092 4. University of Guelph, Guelph，Canada
Two Steps Elution Method FI On-Line Adsorption and Preconcentration Coupled with FAAS for the Determination of Trace Zinc
WANG Zhong-yuan1, ZHANG Hong-kang2*, FANG Hong-da1, SU Yao-dong3, Gauri S. Mittal4
1. South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China 2. College of Light Industry and Food, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China 3. Department of Chemistry, Tongji University, Shanghai 200092, China 4. University of Guelph, Guelph, Canada
Abstract：A flow injection two steps elution method on-line sorption and preconcentration system coupled to flame atomic absorption spectrometry (FAAS) was developed for the determination of trace Zn in water samples. The conventional elution procedure was divided into two steps: elution procedure and detection procedure. During the elution procedure, the eluent was pumped into KR by the suction of the peristaltic pump and through PTFE tube instead of peristaltic pump tube. By the new method, the dispersion of the analyte was decreased notably, and high absorbance peak value was achieved. Because the eluent was not through the peristaltic pump tube, the peristaltic pump tube was protected from being eroded. Emptying procedure was added in order to insure the veracity and repeatability of the experiment of every time. With 60 s (sample throughput of 37·h-1) of sampling at a flow rate of 6.0 mL·min-1, an enhancement factor (EF) of 28 (higher than 9 achieved by conventional elution method) and a detection limit (3σ) of 0.35 μg·L-1 were obtained. The precision (RSD, n=11) was 2.1% at the 20 μg·L-1 level. When 0.1 ‰φ triethannolamine was used as masking reagent, the recovery rate was from 98.7% to 99.6%.
王中瑗1，张宏康2*，方宏达1，苏耀东3，Gauri S.Mittal4. 两步洗脱法FIA-FAAS测定水样中的锌[J]. 光谱学与光谱分析, 2011, 31(12): 3384-3387.
WANG Zhong-yuan1, ZHANG Hong-kang2*, FANG Hong-da1, SU Yao-dong3, Gauri S. Mittal4. Two Steps Elution Method FI On-Line Adsorption and Preconcentration Coupled with FAAS for the Determination of Trace Zinc. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(12): 3384-3387.
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