scholarly journals Determination of Trace Levels of Nitrite in Beverages Samples Through Micellar Improved Catalytic Kinetic Spectrophotometry

2017 ◽  
Vol 38 (3) ◽  
pp. 400-411
Author(s):  
Adil ELİK ◽  
Nail ALTUNAY ◽  
Ramazan GÜRKAN
Keyword(s):  
Kinetic Spectrophotometry ◽  
Catalytic Kinetic Spectrophotometry

scholarly journals Determination of trace amounts of selenium in natural spring waters and tea samples by catalytic kinetic spectrophotometry

2019 ◽  
Vol 44 (4) ◽  
pp. 57 ◽  
Author(s):  
Ramazan Gürkan ◽  
Nevalnur Zeynep Gürkan
Keyword(s):  
Acidic Medium ◽  
Kinetic Method ◽  
Speciation Analysis ◽  
Fixed Time ◽  
Kinetic Spectrophotometry ◽  
The Difference ◽  
Natural Spring ◽  
Good Agreement ◽  
Catalytic Kinetic Spectrophotometry

In this work, a new kinetic method is described for the determination of trace Se(IV) in natural spring waters and commercial tea samples. The method is based on the activation of Se(IV) onto the indicator reaction in acidic medium. The reaction was monitored using a fixed time approach of 20 min at 680 nm. The variables affecting the reaction rate were evaluated and optimized. The method allows the determination of Se(IV) in the range of 0.0125-1.0 mg L-1 with a detection limit of 3.6 µg L-1. The precision was in range of 0.63-3.15% (as RSD %) with a higher recovery than 98.6%. The method has been found to be selective against matrix effect. The method was applied to the speciation analysis of inorganic Se species present in the selected samples. The method was statistically validated by analysis of two certified samples and comparing the obtained results to those of HG-AAS analysis. Also, the total Se levels of the samples were determined by using both methods after conversion of Se(VI) into Se(IV) in ultrasonic bath in acidic medium for 30 min at 85-90 °C. The results were in good agreement with those of HG-AAS. The Se(VI) level of the samples was calculated from the difference between amounts of total Se and Se(IV).

Kinetic-spectrophotometry method for determination of ultra trace amounts of aluminum in food samples

2009 ◽  
Vol 116 (4) ◽  
pp. 1019-1023 ◽  
Author(s):  
Shahryar Abbasi ◽  
Abbas Farmany ◽  
Mohammad Bagher Gholivand ◽  
Ali Naghipour ◽  
Freshteh Abbasi ◽  
...  
Keyword(s):  
Food Samples ◽  
Kinetic Spectrophotometry ◽  
Ultra Trace
Sign in / Sign up

Export Citation Format

Share Document