abstract uranium as a natural radioactive heavy metal widely disperses throughout the earth's crust. in many cases, the natural abundance has been re-distributed due to anthropogenic activities, resulting in radionuclide contamination in groundwater and surface soil. uranium through the plant uptake can enter the chain. the degree of speciation of radio nuclides in soils in areas with differing...

Management of mill tailings is an important part mining operations that aims at preventing environmental dispersion contaminants concern. To this end, geochemical models and reactive transport modeling provide a quantitative assessment the mobility main contaminants. In arid regions with limited rainfall intense evaporation, solutes may significantly differ from usual gravity-driven vertical fl...

A solid chelating material, 1-(2-pyridy1azo)-2-naphthol (PAN) supported on naphthalene provides a rapid and highly selective means of preconcentration of uranium from aqueous solution. Uranium is quantitatively retained on this adsorbent in the pH range 9.8-10.7 with a flow rate of 1 ml min . The metal complex was desorbed with 10 ml of 2 M hydrochloric acid and uranium is determined by d...

Background: Measurement of back ground concentration of uranium in drinking water is very important for many reasons, specially, for human health. The uranium concentration in drinking water in many counties is a matter of concern for clinical and radioactive poisoning. Materials and Methods: The uranium concentration in drinking water is determined using laser flourimatric uranium analyzer. Fo...

Uranium is an alpha-emitting, radioactive, heavy metal that occurs naturally in nearly all rocks and soils. Twenty-two isotopic forms of uranium have been identified, mainly associated with nuclear reactor operations or high-energy physics experiments; the most prevalent isotopes found in the environment are the three naturally-occurring isotopes: U, U, and U. Most uranium isotopes undergo deca...

Abstract Detrital gold fulfils the criteria of chemical inertia and physical durability required by indicator minerals but it has not found wide application in this role because may be formed different deposit types. This problem is soluble, generic compositional features hydrothermal differ according to mineralization environment. The distribution as a minor component where other commodities a...

Total amount of uranium resource in seawater is one thousand times of that in terrestrial ores. A polymeric adsorbent being capable of collecting uranium in seawater was developed in early 1980s, since uranium is inevitable resource to operate atomic power plants. This adsorbent fabric was synthesized by radiation-induced graft polymerization which could impart a desired functional group into f...

In 1975, Social Security beneficiaries were given the option of having their monthly benefit payments sent directly to their banks through an electronic funds transfer system. Since then, beneficiaries have been enrolling in this program in rapidly increasing numbers. At the end of 1976, fewer than 5 million beneficiaries--14 percent of the total--were enrolled in the program. By the end of 198...

Parking Services [1] Parking permits are required to park on campus. Parking permits can be purchased online. Campus Map [2] The Campus map allows you to search for a location on campus by selecting a building or selecting a department name. Identification (ID) card Please visit Human Resources, 5th floor, South Tower, University Centre, to complete an ID application form. Your University of Gu...

Parking Permits [1] Parking permits are required to park on campus. Parking permits can be purchased online. Campus Map [2] The Campus map allows you to search for a location on campus by selecting a building or selecting a department name. Identification (ID) card Please visit Human Resources, 5th floor, South Tower, University Centre, to complete an ID application form. Your University of Gue...