Determination of total chromium in tea samples by suspension dispersive solid phase extraction combined with silver nanoparticles and using flame atomic absorption spectrometry

2015 ◽  
Vol 7 (5) ◽  
pp. 2093-2099 ◽  
Author(s):  
Wei Xiong ◽  
Chunsheng Cheng ◽  
Yaling Yang
Keyword(s):  
Silver Nanoparticles ◽  
Solid Phase Extraction ◽  
Flame Atomic Absorption Spectrometry ◽  
Solid Phase ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Dispersive Solid Phase Extraction ◽  
Total Chromium ◽  
Flame Atomic Absorption

A method to separate and preconcentrate trace levels of chromium using silver nanoparticle (Ag NP) technology and suspension dispersive solid phase extraction is proposed.

scholarly journals Determination of Low Levels of Lead in Beer Using Solid-Phase Extraction and Detection by Flame Atomic Absorption Spectrometry

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Vanessa N. Alves ◽  
Simone S. O. Borges ◽  
Waldomiro B. Neto ◽  
Nívia M. M. Coelho
Keyword(s):  
Solid Phase Extraction ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flow Rate ◽  
Flame Atomic Absorption Spectrometry ◽  
Solid Phase ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Flame Atomic Absorption

In this study, a method for the determination of low concentrations of lead in beer samples using solid-phase extraction with a flow injection analysis system and detection by flame atomic absorption spectrometry (FAAS) was developed.Moringa oleiferaseeds were used as a biosorbent material. Chemical and flow variables of the online preconcentration system, such as sample pH, preconcentration flow rate, eluent flow rate, eluent concentration, particle size, and sorbent mass, were studied. The optimum extraction conditions were obtained using a sample pH of 6.0, sample flow rate of 6.0 mL min−1, 63.0 mg of sorbent mass, and 2.0 mol L−1HNO3at a flow rate of 2.0 mL min−1as the eluent. With the optimized conditions, the preconcentration factor, precision, detection limit, consumption index, and sample throughput were estimated as 93, 0.3% (10.0 μg L−1,n=7), 7.5 μg L−1, 0.11 mL, and 23 samples per hour, respectively. The method developed was successfully applied to beer samples and recovery tests, with recovery ranging from 80% to 100%.

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