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    STUDIA AMBIENTUM - Issue no. 1-2 / 2009  
         
  Article:   ASPECTS CONCERNING THE NANO - SEDIMENTS COMPOZITION AND DISTRIBUTION IN ST. ANA LAKE - ROMANIA.

Authors:  RAMONA FLAVIA CAMPEAN, DUMITRU RISTOIU, GEORGE ARGHIR. 		 
       
         
  Abstract:  The shore sand sample collected from St. Ana Lake shows a wide range size particles, from 500 μm to less then 10 μm to the nano-scale one, particles being sustain by water strata as nano - sediments. The shore sand is formed by andesine amorphous volcanic glass with potasic hornblende and feldspar with traces of potasic biotite, muscovite and hydrate silicate, belonging to the surface formation without any deeper compounds. The identified minerals were found in wide range size particles even at nano-scale. Water samples were collected from surface, 1 m, 2 m, and 3 m deep, deposed on glass layer and investigated with AFM in order to observe the nano-particle distribution. It was found in surface water sample rounded nano-particles with 80 nm average diameters increasing proportional with water deepness. At 1 m was found 125 nm, at 2 m 200 nm, and at 3 m deep, the average diameter was around 300 nm presenting the same morphology as observed for identified minerals. The values obtained indicate a parabolic variation of particle diameter associated with a Gaussian distribution of percentage particle density in each investigated water sample. These aspects can establish a new sedimentation model specific to inland water ecosystems applied also to St. Ana Lake.

Key words: nano-dispersion, AFM microscopy, X – ray diffraction
  
         
     
         
         
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