Acid-base properties of aquatic humic substances isolated from unpolluted tropical black water rivers

1991 ◽  
Vol 339 (9) ◽  
pp. 664-668 ◽  
Author(s):  
Maria Jose Gomez ◽  
Iris Mart� ◽  
Loreto Donoso
1982 ◽  
Vol 47 (11) ◽  
pp. 2882-2889
Author(s):  
Nadezhda Likhareva ◽  
Ladislav Šůcha ◽  
Miloslav Suchánek

Two new compounds from the formazan series, viz. 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan, were prepared, and the dissociation constants and molar absorptivities of all of their acid-base species were determined spectrophotometrically employing the SPEKTFOT computer program.


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