Rhodium complexes of the water-soluble phosphine (2-diphenylphosphinoethyl)trimethylammonium nitrate: Their chemistry in polar solvents, and their use as catalysts in aqueous solution, in aqueous/organic two-phase systems and adsorbed on a cation exchange resin

Abstract An ion exchange method to determine the alkalinity of water-soluble tea ash containing high levels of manganese is described. A chromatographic column containing a strong cation exchange resin (20–50 mesh) in Na+ form, with a bed volume of 5 mL is used. The present ion exchange method is compared to pH titrations and also to the official AOAC methods (31.012, 31.015, 31.016). Results with the new method are accurate and precise.

Download Full-text

The diffusion of electrolytes in a cation-exchange resin membrane I. Theoretical

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1955.0234 ◽

1955 ◽

Vol 232 (1191) ◽

pp. 498-509 ◽

Cited By ~ 356

Keyword(s):

Aqueous Solution ◽

Activity Coefficient ◽

Cation Exchange ◽

Exchange Resin ◽

Volume Fraction ◽

Cation Exchange Resin ◽

Physical Nature ◽

Concentration Difference ◽

Flow Through ◽

Resin Membrane

An equation for the flux of electrolyte through a water-swollen cation-exchange resin membrane separating two solutions of the same electrolyte at different concentrations is derived on the basis of several assumptions regarding the physical nature of a swollen resinous exchanger. The complete flux equation contains three terms, one determined by the concentration difference across the membrane, another determined by the variation of the activity coefficient of the electrolyte with concentration in the membrane and a third concerned with the rate of osmotic or hydrostatic flow through the membrane. If ions in the resin are transported entirely in an internal aqueous phase, the mobilities required for the flux equation can be related to mobilities in aqueous solution and to the volume fraction of resin in the swollen membrane. The treatment is readily extended to anion exchangers.

Download Full-text

Kinetic and Equilibrium Studies of Chromium (III) Removal from Aqueous Solution by IRN-77 Cation-Exchange Resin

Procedia Environmental Sciences ◽

10.1016/j.proenv.2012.10.089 ◽

2012 ◽

Vol 16 ◽

pp. 646-655 ◽

Cited By ~ 8

Author(s):

Huai Li ◽

Jianzheng Li ◽

Zifang Chi ◽

Weishi Ke

Keyword(s):

Aqueous Solution ◽

Cation Exchange ◽

Exchange Resin ◽

Cation Exchange Resin ◽

Equilibrium Studies

Download Full-text

Extraction of extracellular polymeric substances (EPS) from biofilms using a cation exchange resin

Water Science & Technology ◽

10.2166/wst.1995.0287 ◽

1995 ◽

Vol 32 (8) ◽

pp. 157-164 ◽

Cited By ~ 31

Author(s):

A. Jahn ◽

P. H. Nielsen

Keyword(s):

Cation Exchange ◽

Humic Substances ◽

Batch Culture ◽

Extraction Method ◽

Extracellular Polymeric Substances ◽

Exchange Resin ◽

Cation Exchange Resin ◽

Water Soluble ◽

Extraction Time ◽

Plate Count

A cation exchange resin was used to extract water soluble EPS material from different sewer biofilms and a biofilm monoculture of P.putida. The extraction method seemed to be especially suitable for extracting humic substances and proteins from biofilms but also carbohydrate could be extracted, depending on the nature of the sample. Extraction conditions must be well defined because the extraction efficiency was dependent on stirring intensity, amount of cation exchange resin and extraction time. Up to 20% of the total biofilm protein was found in the DOWEX-extractable fraction. No significant cell-lysis up to 2 hours of extraction time could be detected by acridine orange (AO) direct counts. The same was true when applying the extraction method to a batch culture of P.putida. However, the number of viable cells in the batch culture as recorded by plate count technique was reduced to 28 % after 30 min of extraction. In conclusion, proteins and humic substances can be extracted from biofilm EPS in considerable amounts and should be investigated more in detail when analysing the properties of the EPS matrix of a biofilm.

Download Full-text