Mutagenic activity of chlorinated surface waters and humic acid solutions

1994 ◽  
Vol 4 (1) ◽  
pp. 17-31 ◽  
Author(s):  
P. Venier ◽  
A. Bonaldo ◽  
E. Contiero ◽  
G. Navazio ◽  
A.G. Levis
Keyword(s):  
Humic Acid ◽  
Surface Waters ◽  
Mutagenic Activity ◽  
Acid Solutions

WETTABILITY OF MONTMORILLONITE CLAYS IN HUMIC ACID SOLUTIONS

2003 ◽  
Vol 51 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Juan de Dios García López-Durán ◽  
Asmae Khaldoun ◽  
Mohamed Larbi Kerkeb ◽  
María del Mar Ramos-Tejada ◽  
Fernando González-Caballero
Keyword(s):  
Humic Acid ◽  
Acid Solutions ◽  
Montmorillonite Clays

scholarly journals Temperature Induced Aggregation and Clouding in Humic Acid Solutions

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Leah Shaffer ◽  
Ray von Wandruszka
Keyword(s):  
Aqueous Solution ◽  
Light Scattering ◽  
Humic Acid ◽  
Dynamic Light Scattering ◽  
Acid Solutions ◽  
Inverse Temperature ◽  
Mechanical Agitation ◽  
Coulombic Repulsion ◽  
Polarity Sensitive ◽  
Induced Aggregation

Humic acids in aqueous solution demonstrate inverse temperature-solubility relationships when solution conditions are manipulated to reduce coulombic repulsion among the humic polyanions. These effects were followed by dynamic light scattering (DLS) measurements of the resulting aggregates, as well as the addition of a polarity sensitive fluorescent probe (pyrene). The humic solutions could be primed for temperature induced clouding by carefully lowering the pH to a point where hydration effects became dominant. The exact value of the cloud point (CP) was a function of both pH and humate concentration. The CPs mostly lay in the range 50–90°C, but DLS showed that temperature induced aggregation proceeded from approximately 30°C onward. Similar effects could be achieved by adding multivalent cations at concentrations below those which cause spontaneous precipitation. The declouding of clouded humate solutions could be affected by lowering the temperature combined with mechanical agitation to disentangle the humic polymers.

Size exclusion (radio) chromatography of aqueous humic acid solutions with cesium and strontium

1999 ◽  
Vol 241 (1) ◽  
pp. 37-43 ◽  
Author(s):  
P. Rajec ◽  
P. Gerhart ◽  
F. Macášek ◽  
I. S. Shaban ◽  
P. Bartoš
Keyword(s):  
Humic Acid ◽  
Size Exclusion ◽  
Acid Solutions
Sign in / Sign up

Export Citation Format

Share Document