Dissolution of phosphate rocks in soils. 2. Effect of pH on the dissolution and plant availability of phosphate rock in soil with pH dependent charge

1990 ◽  
Vol 24 (3) ◽  
pp. 125-134 ◽  
Author(s):  
N. S. Bolan ◽  
M. J. Hedley
Keyword(s):  
Phosphate Rock ◽  
Phosphate Rocks ◽  
Plant Availability ◽  
Effect Of Ph ◽  
Ph Dependent

scholarly journals Effect of pH on malonyl-CoA inhibition of carnitine palmitoyltransferase I

1983 ◽  
Vol 212 (2) ◽  
pp. 521-524 ◽  
Author(s):  
T W Stephens ◽  
G A Cook ◽  
R A Harris
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Intracellular Ph ◽  
Carnitine Palmitoyltransferase ◽  
Acid Oxidation ◽  
Effect Of Ph ◽  
Malonyl Coa ◽  
Carnitine Palmitoyltransferase I ◽  
Ph Dependent ◽  
Hepatic Fatty Acid Oxidation

Malonyl-CoA inhibition of carnitine palmitoyltransferase I was found to be very pH-dependent. Malonyl-CoA concentrations causing 50% inhibition (I50) at pH 6.0, 6.5, 7.0, 7.5 and 8.0 were 0.04, 1, 9, 40 and 200 microM respectively. It is suggested that a lowering of intracellular pH, such as might occur in ketoacidosis, may attenuate hepatic fatty acid oxidation by increasing malonyl-CoA sensitivity of carnitine palmitoyltransferase I.

Plant availability of phosphorus in superphosphate and a phosphate rock as influenced by earthworms

1982 ◽  
Vol 14 (3) ◽  
pp. 281-287 ◽  
Author(s):  
A.D. Mackay ◽  
J.K. Syers ◽  
J.A. Springett ◽  
P.E.H. Gregg
Keyword(s):  
Phosphate Rock ◽  
Plant Availability

scholarly journals Trace Metal Concentrations in the Liquid Phase of  Phosphate Rock-Treated Soils

2006 ◽  
Vol 55 (1) ◽  
pp. 203-212 ◽  
Author(s):  
Julianna Csillag ◽  
A. Lukács ◽  
E. Osztoics ◽  
P. Csathó ◽  
Gy. Baczó
Keyword(s):  
Soil Solution ◽  
Sandy Soil ◽  
Phosphate Rock ◽  
Toxic Elements ◽  
Time Frame ◽  
Potentially Toxic Elements ◽  
Clay Loam ◽  
Phosphate Rocks ◽  
Clay Loam Soil ◽  
Loam Soil

Concentrations of potentially toxic elements were determined in the soil solution of two soils (acidic sandy and slightly acidic clay loam) treated with phosphate rocks having high Cd content in a pot experiment. Relative concentrations characterizing the mobility of metals (expressed as soil solution concentrations in percentage of their “total” amounts in the phosphate rock-treated soil) decreased with increasing phosphate rock rates in the sandy soil. Mn@Sr>Cd@Co were the most, while Pb and Cr the least mobile elements. The relative concentrations in the clay loam soil were much lower than in the sandy soil and they practically remained constant with increasing phosphate rock rates. It was concluded that in the experimental time frame the environmental risk did not increase with the increase of phosphate rock rate. 

Adsorption of DL-alanine by allophane: effect of pH and unit particle aggregation

Clay Minerals ◽  
1999 ◽  
Vol 34 (2) ◽  
pp. 233-238 ◽  
Author(s):  
H. Hashizume ◽  
B. K. G. Theng
Keyword(s):  
Adsorption Isotherms ◽  
Linear Increase ◽  
Particle Aggregation ◽  
Published Data ◽  
Effect Of Ph ◽  
Linear Rise ◽  
Equilibrium Concentrations ◽  
Ph Dependent ◽  
High Concentrations

AbstractThe adsorption of DL-alanine at pH 4, 6 and 8 by a soil allophane has been determined. Two sets of experiments were carried out: (1) in which the allophane had been kept in a moist state throughout; and (2) in which the mineral had previously been dried at 50°C. In both instances, the adsorption isotherms showed three distinct regions as the concentration of alanine in solution was increased: (1) an initial, nearly linear, rise at low equilibrium concentrations; (2) a levelling off to a plateau at intermediate concentrations; and (3) a steep linear increase at high concentrations. For comparable concentrations of alanine in solution, adsorption decreased in the order pH 6 > pH 8 > pH 4. Irrespective of pH, however, more alanine was adsorbed by the ‘wet’ allophane than by its ‘dry’ counterpart. These observations are interpreted in terms of the morphology and aggregation of allophane unit particles together with the pH-dependent charge characteristics of allophane and alanine. The results are compared with published data on the adsorption of alanine by montmorillonite.

Looking for an Ideal Particle Size for Apatite Flotation

2008 ◽  
Vol 591-593 ◽  
pp. 805-810 ◽  
Author(s):  
R.C. Santana ◽  
A.C.C. Farnese ◽  
S.P. Ceolin ◽  
R.C. Domingues ◽  
M.C.B. Fortes ◽  
...  
Keyword(s):  
Particle Size ◽  
Phosphate Rock ◽  
Size Range ◽  
Phosphorus Recovery ◽  
Column Flotation ◽  
Low Grade ◽  
Phosphate Rocks ◽  
Particle Size Range ◽  
Apatite Group ◽  
Wide Assortment

Today, the phosphate rock processed in the world represents around some 20 billion dollars per year. Some exploitable deposits are characterizing by low grade phosphate rocks, composed of the apatite group in association with a wide assortment of accessory minerals. Usually a combination of beneficiation techniques is used to process a phosphate rock since run of mine, and then a flotation is applied to recovery apatite. This work proposes an evaluation of particle size for apatite recovery by column flotation in bench-scale. The variables collector dosage and depressant dosage were investigated experimentally applying a factorial design. According to the experimental results, the particle size range between 37&m and 105&m is an optimum size used to obtain simultaneously a product with the industry demand grade (at least 33%) and phosphorus recovery, upper than 60%.

Different pH triggered aggregate morphologies in sodium oleate–cationic surfactants mixed systems

2017 ◽  
Vol 41 (17) ◽  
pp. 9142-9151 ◽  
Author(s):  
Nilesh Dharaiya ◽  
Urja Patel ◽  
Debes Ray ◽  
Vinod K. Aswal ◽  
Nandhibatla V. Sastry ◽  
...  
Keyword(s):  
Sodium Oleate ◽  
Cationic Surfactants ◽  
Effect Of Ph ◽  
Unusual Effect ◽  
Aggregate Morphology ◽  
Ph Dependent ◽  
Surfactant Systems ◽  
Mixed Systems

The unusual effect of pH on the aggregate morphology of pH dependent surfactant systems.

Sign in / Sign up

Export Citation Format

Share Document