DETERMINATION OF MINERALS CONTENT IN LEAVES OF MORINGA OLEIFERA BY NEUTRON ACTIVATION ANALYSIS

DETERMINATION OF MINERALS CONTENT IN LEAVES OF MORINGA OLEIFERA BY NEUTRON ACTIVATION ANALYSIS. Moringa oleifera ( Mo) or kelor is a high-value plant, distributed in many tropical and subtropical countries. This plant can be used as a vegetable, cosmetic oil, and medicinal plant. The leaves of Mo is rich in essential minerals needed by the body’s health. Moringa oleifera widely cultivated in various places in Indonesia, easily obtained and inexpensive so precious can be used to overcome malnutrition. Research on the macro-micro mineral content in Moringa leaves here is still limited. Mineral composition in leaves include Mo leaves varies depending on location grow. The purpose of this research is to determine the mineral content in the leaves of the Mo taken from Indonesia. For the preliminary study samples was taken from Central Java to be compared with the results of studies conducted in several other countries. Leaf samples were collected randomly from sampling area. Mineral content in the samples is determined using Neutron Activation Analysis (NAA). Irradiation was carried out at rabbit system of Multipurpose Reactor G.A Siwabessy on neutron flux ~1013 n.cm-2.dt-1. The results obtained indicate that Mo is rich in essential minerals, mainly Ca, Mg, K, Zn, Fe and Cl. Content in dried leaves include: calcium (3.45 % ), magnesium (0.66 %), potassium (3.35 %), chloride (0,25%), iron (147.20 mg/kg), sodium ( 152.52 mg/kg ), zinc (35.71 mg/kg), and manganese (102.10 mg/kg). Mo also contains other minerals such as chromium (4.76 mg/kg), bromine (4.82 mg/kg), cobalt (0.16 mg/kg), and aluminium (150.40 mg/kg) in addition to other element. Compared with the results of existing studies, it shows that mineral composition in Mo leaves varies depending on the location where the plant is grown.

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NEUTRON-ACTIVATION DETERMINATION OF GOLD IN THE TECHNOGENIC RAW MATERIALS DIFFERENT IN MINERAL COMPOSITION

Acta Metallurgica Slovaca ◽

10.12776/ams.v22i2.622 ◽

2016 ◽

Vol 22 (2) ◽

pp. 78

Author(s):

Oksana N. Tsybulskaya ◽

Aleksandr A. Yudakov ◽

Veniamin V. Zheleznov ◽

Sergey I. Ivannikov ◽

Andrei V. Taskin

Keyword(s):

Neutron Activation Analysis ◽

Activation Analysis ◽

Neutron Activation ◽

Mineral Composition ◽

Bottom Ash ◽

Gold Content ◽

Fine Grained ◽

Significant Difference ◽

Activation Determination

The methods of determining the gold content in the technogenic objects of gold mining were analyzed with account of their non-homogeneity and complexity of chemical and mineral composition. A possibility of application of the neutron-activation analysis with the use of the californium source of neutrons for determining the content of fine-grained and extra-fine-grained gold in the technogenic objects including the bottom-ash waste of energy providers is considered. It was demonstrated that the chemical composition of the sample affects the neuron flux distribution inside of the sample which can essentially distort the results of the neutron-activation analysis (NAA). In order to exclude the possible systematic errors, the investigations of the effect of the sample mineral composition on the results of the gold determination using the NAA when loading a large volume of the rock (3–5 kg) into an activation zone and using the matrices of four types: silicate, carbon-containing, iron-containing and titanium magnetite were carried out. It was shown that there is no significant difference in dispersal of the flux of thermal and resonance neutrons from the source of 252Cf when activating the gold-containing technogenic samples with different mineral compositions. The reduction in the quantity of generated atoms of radionuclide 198Au in the gold-containing technogenic samples due to absorption of the flux of thermal neutrons from the source of 252Cf by the macroscales of iron and titanium contained in the sample results in the systematic error of the neutron-activation determination of gold up to 10%.

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Characterization of Heroin: A Preliminary Study

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/53.6.1137 ◽

1970 ◽

Vol 53 (6) ◽

pp. 1137-1139

Author(s):

M J Pro ◽

R L Brunelle

Keyword(s):

Neutron Activation Analysis ◽

Activation Analysis ◽

Chemical Analysis ◽

Neutron Activation ◽

Chemical Elements ◽

Analytical Techniques ◽

Preliminary Examination ◽

Preliminary Study

Abstract Heroin samples from 100 actual cases were examined by multiple analytical techniques. After preliminary examination by microscopy and chemical analysis indicated similarity of questioned and known specimens, as many as 22 chemical elements were measured by neutron activation analysis and atomic absorption. Since illicit heroin is crudely produced, the qualitative elemental analysis is significant; however, more important for characterization purposes is the quantitative determination of the elements found because the concentration ranges for each element are extremely large.

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