99/02352 A radiochemical neutron activation analysis method for the determination of total mercury in coal

1999 ◽  
Vol 40 (4) ◽  
pp. 249
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Total Mercury ◽  
Radiochemical Neutron Activation Analysis ◽  
Analysis Method ◽  
Neutron Activation Analysis Method ◽  
Activation Analysis Method

Determination of selenium in roasted beans coffee samples consumed in Algeria by radiochemical neutron activation analysis method

2018 ◽  
Vol 106 (2) ◽  
pp. 141-146 ◽  
Author(s):  
Mohammed Messaoudi ◽  
Samir Begaa ◽  
Lylia Hamidatou ◽  
M’hamed Salhi
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Radiochemical Neutron Activation Analysis ◽  
Analysis Method ◽  
Coffee Beans ◽  
Ultra Trace ◽  
Neutron Activation Analysis Method ◽  
Activation Analysis Method

AbstractThe essential trace element selenium is a focus of attention due to its effects on human health, there being consequences of both its deficiency and excess. Due to the ultra-trace content of selenium, the neutron activation analysis method (NAA) is difficult to apply. We therefore made use of the radiochemical neutron activation analysis (RNAA) to determine Se at low level concentrations in several consumed food items in Algeria. A radiochemical procedure based on liquid–liquid separation was established in our laboratory. In this research we focused on the determination of selenium in two species of coffee: Arabica and Robusta. The accuracy of the method was assessed by analyzing the certified reference material NIST-SRM 1573a (tomato leaves). The results obtained show a selenium variation from 0.025 to 0.052 μg/g in coffee beans and an average yield of the separation of about 85%. The results of this study were compared with those obtained with samples from Brazilian, Caribbean, Indian and Kenyan coffee beans.

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