China, Vietnam, Brazil, and Russia have the largest deposits of rare earths. However, in recent works, occurrence light earth elements has been demonstrated an exhalative sedimentary type mineral (SEDEX) Mexico, with adequate Ce Nd contents. Additionally, it is this that used to study cation exchange capacity non-metallic minerals organic materials, such as bentonite, diatomite, eggshell. To ca...

The magnetic recoverable ZnO/ZnFe2O4/diatomite (ZZFDT) composite was synthesized by hydrothermal-precipitation method. structure, optical properties and of the composites were characterized different analytical instruments. ZZFDT-1 is composed cubic spinel, hexagonal wurtzite, tetrahedron structure. SEM TEM showed that ZnO ZnFe2O4 particles loaded onto surface diatomite, particle size uniform. ...

background diatomite coated by nanoparticles of copper and zinc mixed oxides were used to investigate catalytic oxidation of carbon monoxide. objectives aim of this paper was to investigatediatomite performance as a supporting host to confine the cuo and zno nanoparticles and its catalytic activity for carbon monoxide oxidation. materials and methods the prepared catalysts were characterized by...

I am writing this letter on behalf of the International Diatomite Producers Association (“IDPA”), a trade association of producers of diatomaceous earth products that was formed in 1987. IDPA includes in its membership companies both doing business and operating facilities in the state of California. IDPA sponsored one of the principal epidemiology studies relating to crystalline silica exposur...

Medicinal plants are one of very valuable rescores in wide range of world and Iran natural resources. Herbal medicines against chemical and synthetic drugs have bad effects and minor side effects and or are completely harmless. Interest in ethnobotany has increased dramatically in recent years. Medicinal folklore over the years has proved to be an invaluable guide in present day screening of dr...

deoxynivalenol contamination was determined in corn produced in golestan and ardabil (moqan) provinces, iran, in 2004-2005. samples were collected from different stages of production, including before harvest, at harvest, post harvest as well as after drying. ground sub samples were extracted with water; each extracted sample was cleaned up through an immunoaffinity column. deoxynivalenol was e...

The authors of this paper use an original method diatomaceous earth fractionation, which allows for obtaining a filler with specific particle size distribution. makes it possible to separate small, disintegrated and broken diatom frustules from those maintained their form in earth. study covers range tests conducted prove that such separated diatomic fraction (3–30 µm) shows features different ...