Oxalate-enhanced solubility of lead (Pb) in the presence of phosphate: pH control on mineral precipitation

2019 ◽  
Vol 21 (4) ◽  
pp. 738-747 ◽  
Author(s):  
Murray B. McBride ◽  
Sabrina E. Kelch ◽  
Michael P. Schmidt ◽  
Sonam Sherpa ◽  
Carmen Enid Martinez ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acid ◽  
Ph Control ◽  
Low Molecular Weight ◽  
Mineral Precipitation ◽  
Enhanced Solubility ◽  
Ph Range

Here we study the precipitation of lead (Pb)-phosphate minerals over the pH range of 4.0 to 8.0 with and without oxalate, a ubiquitous and abundant low-molecular-weight organic acid derived from plants and microorganisms.

Modelling low molecular weight organic acid dynamics in forest soils

2005 ◽  
Vol 37 (3) ◽  
pp. 517-531 ◽  
Author(s):  
Patrick A.W. van Hees ◽  
David L. Jones ◽  
Lars Nyberg ◽  
Sara J.M. Holmström ◽  
Douglas L. Godbold ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Acid ◽  
Forest Soils ◽  
Low Molecular Weight

The Synthesis of Benzothiazole Polymers with Perpendicularly Attached Phenyl Substituents

1988 ◽  
Vol 134 ◽  
Author(s):  
William A. Feld ◽  
YiHua Chang ◽  
John D. Peak ◽  
Scott G. Wierschke ◽  
Join Pin Chen
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Low Molecular Weight ◽  
Enhanced Solubility

ABSTRACTA series of 2-aryl-4,7-benzothiazoledicarboxylic acids have been synthesized from the corresponding dimethyl derivatives. These derivatives contain the phenyl, and the p-bromo-, mchloro-, p-chloro-, m-methoxy-, and p-methoxyphenyl aryl substituents. The phenyl, pchlorophenyl and p-methoxyphenyl substituted diacids were polymerized with 2,5-diamino-1,4- benzenedithiol dihydrochloride to yield the corresponding poly(benzothiazole)s. The polymers were of low molecular weight (intrinsic viscosity as high as 1.7) and did not show enhanced solubility in common solvents.

scholarly journals Effects of cadmium amendments on low-molecular-weight organic acid exudates in rhizosphere soils of tobacco and sunflower

2006 ◽  
Vol 21 (5) ◽  
pp. 479-488 ◽  
Author(s):  
Po-Neng Chiang ◽  
Ming Kuang Wang ◽  
Chih Yu Chiu ◽  
Shu-Yen Chou
Keyword(s):  
Molecular Weight ◽  
Organic Acid ◽  
Low Molecular Weight ◽  
Rhizosphere Soils

scholarly journals The microsporidian spore invasion tube. The ultrastructure, isolation, and characterization of the protein comprising the tube.

1976 ◽  
Vol 71 (1) ◽  
pp. 23-34 ◽  
Author(s):  
E Weidner
Keyword(s):  
Molecular Weight ◽  
Sodium Dodecyl ◽  
Low Molecular Weight ◽  
Two Dimensional ◽  
Polar Tube ◽  
Isolation And Characterization ◽  
Disulfide Linkages ◽  
Microsporidian Spore ◽  
Ph Range

The extrusion apparatus of the microsporidian parasitic protozoan Nosema michaelis discharges an invasion (or polar) tube with a velocity suitalbe for piercing cells and injecting infective sporoplasm. The tube is composed of a polar tube protein (PTP) which consists of a single, low molecular weight polypeptide slightly smaller than chymotrypsinogen-A. Assembled PTP tubes resist dissociation in sodium dodecyl sulfate and brief exposures in media at extreme ends of the pH range; however, the tubes are reduced by mercaptoethanol and dithiothreitol. When acidified, mercaptoethanol-reduced PTP self-assembles into plastic, two-dimensional monolayers. Dithiothreitol-reduced PTP will not reassemble when acidified. Evidence is presented which indicates that PTP is assembled as a tube within the spore; that the ejected tube has plasticity during sporoplasm passage; and, finally, that the subunits within the tube polymer are bound together, in part, by interprotein disulfide linkages.

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