Selective Determination of Chromium(VI) in Industrial Wastewater Samples by Micro-Electromembrane Extraction Combined with Electrothermal Atomic Absorption Spectrometry

2018 ◽  
Vol 229 (3) ◽  
Author(s):  
Saeed Nojavan ◽  
Turaj Rahmani ◽  
Sozan Mansouri
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Industrial Wastewater ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Selective Determination ◽  
Chromium Vi ◽  
Electromembrane Extraction ◽  
Wastewater Samples

scholarly journals Selective Determination of Chromium (VI) in Powdered Milk Infant Formulas by Electrothermal Atomization Atomic Absorption Spectrometry after Ion Exchange

2000 ◽  
Vol 83 (1) ◽  
pp. 220-223 ◽  
Author(s):  
Maria E Soares ◽  
Maria L Bastos ◽  
Margarida Ferreira
Keyword(s):  
Ion Exchange ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Electrothermal Atomization ◽  
Infant Formulas ◽  
Powdered Milk ◽  
Selective Determination ◽  
Chromium Vi

Abstract A previously developed method was adapted to the selective determination of hexavalent chromium in powdered milk infant formulas. The species in reconstituted milk was separated on an ion-exchange column, Chromabond NH2, and measured by electrothermal atomization atomic absorption spectrometry. The detection limit was 1.8 μg/L, and the linearity range under optimized conditions was 1.8–50.0 μg/L. The precision values were 4.1 and 6.5% for the analytical and overall procedures, respectively. The procedure was validated by the method of standard additions (5.0, 10.0, and 25.0 μg/L), and the recoveries were all > 93%. The developed method is sensitive, accurate, and precise for determination of Cr(VI) in powdered milks. It was applied to the determination of Cr(VI) in 20 commercial brands, i.e., 7 infant formulas, 5 follow-up milks, and 8 dietetic milks. The values found ranged from < 10 to 75 ng/g.

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