Vesna Markoska

MIT University · MIT University Skopje- Faculty of Environmental Resources Management

In this research the sorption of the cations NH4+, Al3+, Fe2+, Mn2+, and Mg2+in powdered perlite and its mixture with soil was monitored. Of all observed cations in perlite by the first minutes of laboratory experiments, which is very fast, the ammonia sorption cations reacted fastest. Тhe dynamics of nitrate and ammonia nitrogen in the soil after...

PROBLEMS OF AGRICULTURE AND FOOD - EFFECTS OF UNSUSTAINABLE DEVELOPMENT AND THE NECESSITY OF CHANGE By Radovan PEJANOVIC The current concept of unsustainable development has led, among other things, to serious problems in agriculture and food production. The negative effects of conventional agriculture so far are numerous: erosion and degrada-tion...

Perlite is a generic name for an amorphous volcanic rock that expands by a factor of 4-20 when rapidly heated to (760-1100°C). Water trapped in the structure of the material vaporises and escapes, and this causes the expansion of the material to 7-16 times its original volume. The expanded material is a brilliant white, due to the reflectivity of t...

The results of the water retention curves between (pF-2 and-4.2) matric potential for two substrates perlite and peat, are presented in this paper. Perlite is an inorganic, expanded aluminosilicate of volcanic origin. Peat is an organic substrate. For assessing this parameter, the method of bar extractors and Porous plate extractors have been explo...

Multiannual improper application of fertilizers in the soil leads to strong changes in the solum. It causes disorders of the soil properties that reflect the reduction of productivity and soil fertility. Foliar nutrition represents an application of water soluble fertilizers directly through the plant leaf. Its effectiveness is estimated based on a...

Zeolite NaY with its structure corresponds to the natural zeolite foshazit. NaY zeolite has the following formula: Na2O · Al2O3 · xSiO2 · yH2O → Na12( AlO2)12 · (SiO2)12 · 27H2O Its structure is strong and it is necessary to perform dealumination to be used as an adsorbent. In present examinations dealumination is performed, extracting Al structure...

Zeofit as ecological product is new to the Macedonian market, having a wide range of functioning. According to its chemical composition it is a natural raw material created through the opalization and is part of the group of zeolitizes volcanic rocks. The zeofit produces extraordinary results in the area of fruit-growing, stock-breeding, market gar...

ABSTRACT The natural zeolite - clinoptiolite is isotype of hollandite with chemical formula (NaKCa)2-3Al3(Al,Si)2Si13O36∙12 H2O. The formula shows that the structure of clinoptilolite beside AlO4- and SiO4- tetrahedrons includes Na+, K+ and Ca+ cations. This zeolite has a high dehydration stability and is thermally stabile at 700 oC at the air envi...

Zeolites as micropore adsorbents are characterized by a pore diameter of less than 1.5 nm. The basic characteristic of the micropore absorbers is the emergence of the molecular sieves action which is expressed with the absorption to specific molecules, the diameter of which is less than the open micropore. This way, the zeolites appear to be typica...

ABSTRACT Crystallization of the zeolites is the most important process in the course of the synthesis of the zeolites since, due to character of the process there are several factors which have influence on the process.The kinetics of the crystallization process is determined with the following of the percentage of crystallization of zeolite subjec...

Zeolitite as an independent group of natural hidroaluminosillicates of alkalines and alkaline earth elements. Because of their unique porous properties, zeolites are used in a variety of applications with a global market. In the western world, major uses are in petrochemical cracking, ion - exchange (water softening and purification), and in the se...