Determination of calcium, magnesium, sodium and potassium in wines by FIA using an automatic zone sampling system

1996 ◽  
Vol 55 (4) ◽  
pp. 397-402 ◽  
Author(s):  
Rui A.S. Lapa ◽  
JoséL.F.C. Lima ◽  
João L.M. Santos
Keyword(s):  
Sampling System ◽  
Calcium Magnesium ◽  
Zone Sampling ◽  
Sodium And Potassium

scholarly journals Determination of Calcium, Magnesium, Sodium, and Potassium in Foodstuffs by Using a Microsampling Flame Atomic Absorption Spectrometric Method After Closed-Vessel Microwave Digestion: Method Validation

2010 ◽  
Vol 93 (6) ◽  
pp. 1888-1896 ◽  
Author(s):  
Rachida Chekri ◽  
Laurent Noël ◽  
Christelle Vastel ◽  
Sandrine Millour ◽  
Ali Kadar ◽  
...  
Keyword(s):  
Atomic Absorption ◽  
Microwave Digestion ◽  
Performance Criteria ◽  
Internal Quality ◽  
Spectrometric Method ◽  
Closed Vessel ◽  
Flame Atomic Absorption ◽  
Calcium Magnesium ◽  
Sodium And Potassium

Abstract This paper describes a validation process in compliance with the NF/EN ISO/IEC 17025 standard for the determination of the macrominerals calcium, magnesium, sodium, and potassium in foodstuffs by microsampling with flame atomic absorption spectrometry after closed-vessel microwave digestion. The French Standards Commission (Agence Francaise de Normalisation) standards NF V03-110, NF EN V03-115, and XP T-90-210 were used to evaluate this method. The method was validated in the context of an analysis of the 1322 food samples of the second French Total Diet Study (TDS). Several performance criteria (linearity, LOQ, specificity, trueness, precision under repeatability conditions, and intermediate precision reproducibility) were evaluated. Furthermore, the method was monitored by several internal quality controls. The LOQ values obtained (25, 5, 8.3, and 8.3 mg/kg for Ca, Mg, Na, and K, respectively) were in compliance with the needs of the TDS. The method provided accurate results as demonstrated by a repeatability CV (CVr) of <7 and a reproducibility CV (CVR) of <12 for all the elements. Therefore, the results indicated that this method could be used in the laboratory for the routine determination of these four elements in foodstuffs with acceptable analytical performance.

A scheme of semi-micro analysis for the major elements in clay minerals, based on modifications to conventional methods of silicate analysis

Clay Minerals ◽  
1969 ◽  
Vol 8 (1) ◽  
pp. 1-13 ◽  
Author(s):  
G. Pruden ◽  
H. G. C. King
Keyword(s):  
Clay Minerals ◽  
Ferrous Iron ◽  
Major Elements ◽  
Total Iron ◽  
Total Water ◽  
Calcium Magnesium ◽  
Micro Analysis ◽  
Sodium And Potassium ◽  
Colorimetric Methods

A scheme is presented for the semi-micro analysis for the major elements in clay minerals, based mainly on improvements to conventional colorimetric methods. Silica and alumina are determined after fusing a 50-mg sample with sodium hydroxide. Titanium, total iron, calcium, magnesium, phosphorus and manganese are determined colorimetrically on a hydrofluoric-sulphuric acid digest of a 50-mg sample; sodium and potassium are determined flame photometrically on the same digest. Ferrous iron is determined separately. Additional methods for the determination of total water, total sulphur and fluorine are indicated.

Analysis in the Concentration, Determination and Comparison of some Mineral Elements in the Natural Salt-Licks Utilized by Elephants: Mt. Elgon National Park Case Study

2011 ◽  
Vol 356-360 ◽  
pp. 1796-1800
Author(s):  
Anne J. Sitienei ◽  
Ji Wen Ge ◽  
Shadrack M. Ngene ◽  
Mupenzi Jean De La Paix ◽  
Fred. K. Waweru
Keyword(s):  
National Park ◽  
Eating Behaviour ◽  
Mineral Elements ◽  
Individual Identification ◽  
Mineral Supplement ◽  
Sodium Potassium ◽  
Calcium Magnesium ◽  
Sodium And Potassium

The aim of the study undertaken at Mt. Elgon National Park was to determine the chemical composition and variation of some mineral elements in saltlicks utilized by elephants in Mt. Elgon National Park. Laboratory analysis was done for individual identification and determination of the concentration for sodium potassium, calcium, magnesium and phosphorus. Rock samples were processed using Double Acid Technique. The elephants of Mt. Elgon have been engaging in earth eating behaviour. regular visits to saltlicks located in caves is as a result of some of the mineral elements such as sodium potassium and calcium. The park management could overcome the problem of elephants entering the saltlicks by having sodium and potassium mineral supplement policy for the park.

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