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    STUDIA GEOLOGIA - Ediţia nr.1 din 2007  
         
  Articol:   DIURNAL VARIATIONS OF SULPHATE CONCENTRATION AND SULPHUR ISOTOPIC COMPOSITION (δ34S) OF SULPHATE ION IN THE SULEJOW RESERVOIR.

Autori:  W. DRZEWICKI, A. TROJANOWSKA, MARIUSZ-ORION JĘDRYSEK, D. LEWICKA-SZCZEBAK, MACIEJ GÓRKA, STANISLAW HAŁAS. 		 
       
         
  Rezumat:  The research concerns diurnal variations of dissolved sulphate ion concentration (C (SO4 2-)) and sulphur isotopic composition (δ34S (SO4 2-)) of this ion. Series of daily water samples were collected twice: in summer (July 26th - 27th 2006) and winter (February 2nd - 3rd 2007) from the Sulejow dam reservoir (Central Poland). Clear, regular diurnal variations of sulphate ion concentration have been observed in both summer and winter. C (SO4 2-) varied from 20.2 mg dm-3 at 02:00 to 23.6 mg dm-3 at 10:00 in summer and from 18.31 mg dm-3 at 02:00 to 27.63 mg dm-3 at 20:00 in winter. Similar, but less distinct, diurnal variations of sulphur isotopic composition (of about 1‰) have been noted. δ34S (SO4 2-) varied between 4.44‰ at 10:00 and 5.39‰ at 02:00 in summer and between 2.21‰ at 08:00, and 3.31‰ at 20:00 in winter.  
         
     
         
         
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