Studies on the Determination of Mercury by On-line Solvent Extraction and Non-Aqueous Media Hydride Generation Non-Dispersive Atomic Fluorescence Spectrometry

2004 ◽  
Vol 148 (3-4) ◽  
pp. 221-225 ◽  
Author(s):  
Guo Xin ◽  
Zheng Chuguang ◽  
Jin Zexiang ◽  
Tang Zhiyong
Keyword(s):  
Solvent Extraction ◽  
Aqueous Media ◽  
Hydride Generation ◽  
Fluorescence Spectrometry ◽  
Atomic Fluorescence Spectrometry ◽  
Atomic Fluorescence ◽  
On Line

scholarly journals A Multicommutated Flow System for Determination of Bismuth in Milk Shakes by Hydride Generation Atomic Fluorescence Spectrometry Incorporating On-Line Neutralization of Waste Effluent

2004 ◽  
Vol 87 (5) ◽  
pp. 1252-1259 ◽  
Author(s):  
Josep F Ventura-Gayete ◽  
Eva Ródenas-Torralba ◽  
Ángel Morales-Rubio ◽  
Salvador Garrigues ◽  
Miguel De La Guardia
Keyword(s):  
Continuous Measurement ◽  
Limit Of Detection ◽  
Hydride Generation ◽  
Fluorescence Spectrometry ◽  
Atomic Fluorescence Spectrometry ◽  
Control Analysis ◽  
Probability Level ◽  
Atomic Fluorescence ◽  
On Line

Abstract A highly sensitive method was developed for determination of bismuth in milk shakes by multicommutation hydride generation atomic fluorescence spectrometry (HG-AFS) based on off-line sonication for 10 min with aqua regia 8% (v/v) and on-line waste treatment. The instrumentation and chemistry variables were studied in order to provide the best performance. The limit of detection in the original samples, established for a probability level of 99.6% (k = 3), was 1.67 ng/g Bi. The method provides a fast alternative in control analysis with a sampling throughput of 72 h as compared with 31 h obtained by the classical continuous measurement. Additionally, multicommutation reduces waste generation by a factor of 2.6. The consumption of sample, reductant, and blank, as compared with continuous mode HG-AFS, was reduced 9.6, 4.5, and 13.3 times, respectively. To confirm the accuracy of the method, recovery studies were performed, and excellent agreement between multicommutation and continuous measurement-based values was obtained. Application of the developed methodology for bismuth determination in milk shake samples from the Spanish market provided concentrations ranging from 4.2 to 15.0 ng/mL, and good comparability with data obtained by continuous measurements after microwave-assisted total digestion of samples for a 95% probability level and 12 degrees of freedom was found.

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