Modulation of cupric ion activity by pH and fulvic acid as determinants of toxicity inXenopus laevisembryos and larvae

1996 ◽  
Vol 15 (4) ◽  
pp. 568-573 ◽  
Author(s):  
David B. Buchwalter ◽  
Greg Linder ◽  
Lawrence R. Curtis
Keyword(s):  
Fulvic Acid ◽  
Cupric Ion ◽  
Ion Activity

Indirect aluminum toxicity to the green alga Scenedesmus through increased cupric ion activity

1987 ◽  
Vol 21 (5) ◽  
pp. 435-438 ◽  
Author(s):  
John G. Rueter ◽  
Kirk T. O'Reilly ◽  
Richard R. Petersen
Keyword(s):  
Green Alga ◽  
Aluminum Toxicity ◽  
Cupric Ion ◽  
Ion Activity

Cupric Ion Complexation by Fulvic Acid Extracted from Sewage Sludge-Soil Mixtures

1979 ◽  
Vol 43 (6) ◽  
pp. 1148-1155 ◽  
Author(s):  
Garrison Sposito ◽  
Kenneth M. Holtzclaw ◽  
C. S. LeVesque-Madore
Keyword(s):  
Sewage Sludge ◽  
Fulvic Acid ◽  
Cupric Ion ◽  
Ion Complexation ◽  
Soil Mixtures

Sublethal effects of cupric ion activity on the phototaxis of three calanoid copepods

Hydrobiologia ◽  
1994 ◽  
Vol 292-293 (1) ◽  
pp. 505-511 ◽  
Author(s):  
D. E. Steams ◽  
A. A. Sharp
Keyword(s):  
Sublethal Effects ◽  
Calanoid Copepods ◽  
Cupric Ion ◽  
Ion Activity

CHELATION STUDY OF COPPER (II): FULVIC ACID SYSTEM

1973 ◽  
Vol 53 (4) ◽  
pp. 377-382 ◽  
Author(s):  
VENGHUOT CHEAM
Keyword(s):  
Fulvic Acid ◽  
Mole Fraction ◽  
Sodium Nitrate ◽  
Direct Approach ◽  
Acid System ◽  
Selective Electrode ◽  
Cupric Ion ◽  
Equilibrium Quotient ◽  
Chelation Reaction ◽  
Nitrate Solutions

The chelation reaction between Cu (II) and fulvic acid has been investigated using a relatively new direct approach — that of titration with a cupric ion-selective electrode. The results of different investigators are in fair agreement with each other if they are interpreted in terms of both pH and mole fraction of reactants. In 0.1 M sodium nitrate solutions with a copper mole fraction equal to 0.5 ± 0.2, the equilibrium quotient at 25 C and pH 3 was found to be 2.2 ± 0.1.

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