Adsorption and Recovery of Dissolved Organic Phosphorus and Nitrogen by Mixed-Bed Ion-Exchange Resin

2003 ◽  
Vol 67 (3) ◽  
pp. 889 ◽  
Author(s):  
Jacques L. Langlois ◽  
Dale W. Johnson ◽  
Guy R. Mehuys
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Organic Phosphorus ◽  
Ion Exchange Resin ◽  
Dissolved Organic Phosphorus ◽  
Mixed Bed Ion Exchange

Improved thin-layer chromatographic method in the diagnosis of mannosidosis.

1978 ◽  
Vol 24 (9) ◽  
pp. 1576-1577 ◽  
Author(s):  
R B Friedman ◽  
M A Williams ◽  
H W Moser ◽  
E H Kolodny
Keyword(s):  
Ion Exchange ◽  
Thin Layer ◽  
Silica Gel ◽  
Urine Sample ◽  
Chromatographic Method ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Charged Species ◽  
Disease States ◽  
Mixed Bed Ion Exchange

Abstract An improved thin-layer chromatographic method is described for the facile separation of neutral oligosaccharides excreted in the urine of patients with mannosidosis. The urine sample is treated with mixed-bed ion-exchange resin to remove charged species. The eluate is then chromatographed on silica gel thin-layer plates with n-propanol water as the developer. Eleven unique orcinol-positive components can thus be resolved. The advantages of this method over previously described techniques are the ease and rapidity of assay, better resolution of components, and clarity of resolution. It should be applicable to other disease states in which distinctive neutral carbohydrate products are produced.

Washing procedure for mixed‐bed ion exchange resin decontamination for in situ nutrient adsorption

2000 ◽  
Vol 31 (3-4) ◽  
pp. 543-546 ◽  
Author(s):  
Nelson Thiffault ◽  
Robert Jobidon ◽  
Carol De Blois ◽  
Alison D. Munson
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Mixed Bed Ion Exchange

scholarly journals A Throughfall Collection Method Using Mixed Bed Ion Exchange Resin Columns

2002 ◽  
Vol 2 ◽  
pp. 122-130 ◽  
Author(s):  
Mark E. Fenn ◽  
Mark A. Poth ◽  
Michael J. Arbaugh
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
N Deposition ◽  
Bulk Deposition ◽  
Precipitation Event ◽  
Sample Collection ◽  
Resin Column ◽  
San Bernardino Mountains ◽  
Mixed Bed Ion Exchange

Measurement of ionic deposition in throughfall is a widely used method for measuring deposition inputs to the forest floor. Many studies have been published, providing a large database of throughfall deposition inputs to forests. However, throughfall collection and analysis is labor intensive and expensive because of the large number of replicate collectors needed and because sample collection and chemical analyses are required on a stochastic precipitation event-based schedule. Therefore we developed and tested a throughfall collector system using a mixed bed ion exchange resin column. We anticipate that this method will typically require only one to three samplings per year. With this method, bulk deposition and bulk throughfall are collected by a funnel or snow tube and ions are retained as the solution percolates through the resin column. Ions retained by the resin are then extracted in the same column with 2N KCl and analyzed for nitrate and ammonium. Deposition values in throughfall from conventional throughfall solution collectors and colocated ion exchange samplers were not significantly different during consecutive 3- and 4-month exposure periods at a high (Camp Paivika; >35 kg N ha-1year-1) and a low deposition (Barton Flats; 5–9 kg N ha-1year-1) site in the San Bernardino Mountains in southern California. N deposition in throughfall under mature pine trees at Camp Paivika after 7 months of exposure was extremely high (87 and 92 kg ha-1based on the two collector types) compared to Barton Flats (11 and 13 kg ha-1). A large proportion of the N deposited in throughfall at Camp Paivika occurred as fog drip, demonstrating the importance of fog deposition as an input source of N at this site. By comparison, bulk deposition rates in open areas were 5.1 and 5.4 kg ha-1at Camp Paivika based on the two collector types, and 1.9 and 3.0 kg ha-1at Barton Flats.

Effects of Acidification on Mobilization of Heavy Metals and Radionuclides from the Sediments of a Freshwater Lake

1980 ◽  
Vol 37 (3) ◽  
pp. 373-377 ◽  
Author(s):  
D. W. Schindler ◽  
R. H. Hesslein ◽  
R. Wagemann ◽  
W. S. Broecker
Keyword(s):  
Heavy Metals ◽  
Ion Exchange ◽  
Water Column ◽  
Activated Charcoal ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Overlying Water ◽  
Manganese Zinc ◽  
Mixed Bed Ion Exchange ◽  
Log Linear

Large (10 m) diameter enclosures were sealed to the sediments in 2–2.5 m of water in Lake 223. Two tubes were held at control pH (6.7–6.8), one was lowered to pH 5.7 and one to pH 5.1, using H2SO4. Aluminum, manganese, zinc, and iron were released from lake sediments at pH 5 and 6. Concentrations of zinc in the overlying water column exceeded 300 μg∙L−1. Radioisotopes of several heavy metals added to the water of the enclosure showed the following: all metals were removed from the water at log-linear rates, with half-times of 5–25 d. Acidification caused several metals to become more soluble, including Fe-59, Co-60, Mn-54, and Zn-65. Solubility of V-48 and Hg-203 decreased with increasing acidity. Acidification also slowed the loss to sediments of Mn-54 and Zn-65. Losses of Ba-133, Se-75, Cs-134, and V-48 were more rapid under acid conditions. The fractions of any isotope retained by a 0.45-μm filter, activated charcoal and mixed-bed ion exchange resin remained constant throughout the experiment at any given pH.Key words: sediment–water interactions, heavy metals, radionuclides, lake acidification

Effect of Infusing Selected Chemical Compounds on Dentinal Fluid Movement in the Rat

1975 ◽  
Vol 54 (3) ◽  
pp. 567-569 ◽  
Author(s):  
Ralph R. Steinman ◽  
John Leonora
Keyword(s):  
Ion Exchange ◽  
Aspartic Acid ◽  
Exchange Resin ◽  
Chemical Compounds ◽  
Ion Exchange Resin ◽  
Carbamyl Phosphate ◽  
Arterial Infusion ◽  
Fluid Movement ◽  
Mixed Bed Ion Exchange ◽  
Sodium Cyanate

Intra-arterial infusion of carbamyl phosphate or of carbamyl-DL-aspartic acid into rats on a cariogenic diet greatly stimulated the movement of fluid through the odontoblastic processes. The infusion of sodium cyanate also stimulated fluid movement. Guanidine HCl and L-asparagine were active at higher concentrations. Purifying the urea on a mixed-bed ion exchange resin virtually removed its stimulatory effect on dentinal fluid movement. The action of urea is apparently attributable to contamination with sodium cyanate.

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