scholarly journals Evaluating the Effects of Tri-Butyl Phosphate and Normal Paraffin Hydrocarbon in Simulated Low-Activity Waste Solution on Ion Exchange

2003 ◽  
Author(s):  
K Adu-Wusu
Keyword(s):  
Ion Exchange ◽  
Paraffin Hydrocarbon ◽  
Normal Paraffin ◽  
Waste Solution ◽  
Low Activity

Ion exchange studies for the removal of plutonium and americium from organic liquid scintillator waste solution

2006 ◽  
Vol 94 (12) ◽  
Author(s):  
K. V. Chetty ◽  
R. Swarup ◽  
V. Venugopal ◽  
P. R. Vasudeva Rao
Keyword(s):  
Ion Exchange ◽  
Radioactive Waste ◽  
Liquid Scintillator ◽  
Organic Liquid ◽  
Phosphinic Acid ◽  
Alpha Activity ◽  
Waste Solution ◽  
Radioactive Nuclides ◽  
Active Waste ◽  
Batch Data

Removal of radioactive nuclides from effluents is important for the safe disposal of the radioactive waste. In the present work ion exchange studies were carried out using simulated alpha active organic liquid scintillator and ethyl alcohol waste solutions containing Pu and Am using different resins. The time of equilibration and batch data were obtained under different conditions for individual resins as well as their mixtures. The indigenously developed Macroporous bifunctional phosphinic acid (MPBPA) resin was found to be suitable for the removal of alpha activity mainly due to Pu and Amberlite IR-120 and Biorad 50W × 8 for removal of Am. The results indicated that the presence of alcohol in the scintillator solution helps in increasing the distribution ratio. Experiments were carried out with column containing either MPBPA resin alone or with additional resin bed of Amberlite IR-120 using active organic liquid scintillator waste (with and without dilution with alcohol). Studies were also carried out on alcoholic waste generated in the laboratory during the washing of the used liquid scintillator vials. The alcohol after removal of activity either could be reused or could be disposed off directly as a ‘potentially’ active waste.

scholarly journals Control of 5-aminolaevulinate synthetase activity in Rhodopseudomonas spheroides a role for trisulphides

1975 ◽  
Vol 150 (2) ◽  
pp. 245-257 ◽  
Author(s):  
J D Sandy ◽  
R C Davies ◽  
A Neuberger
Keyword(s):  
Ion Exchange ◽  
Extraction Procedure ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Synthetase Activity ◽  
Multiple Forms ◽  
Anaerobic Culture ◽  
Structural Requirement ◽  
Rhodopseudomonas Spheroides ◽  
Low Activity

1. The aminolaevulinate synthetase activator of fresh extracts of semi-anaerobically grown Rhodopseudomonas spheroids was resolved into two fractions by ion-exchange chromatography. One fraction was identified as cystine trisulphide (CySSSCy). Analysis of the other fraction indicated the presence of about equal amounts of glutathione trisulphide (GSSSG) and the mixed trisulphide of glutathione and cystine (GSSSCy). 2. Four further fractions with activator activity were observed on ion-exchange chromatography of extracts prepared by methods similar to those described earlier [Neuberger et al. (1973)Biochem. J. 136,491-499]. These activators were generated by the extraction procedure. Two of them have been identified as trisulphanedisulphonate (S5O62-) and additional cystine trisulphide. 3. For the series of polysulphanedisulphonates (-O3S-Sn-SO3-, n greater than or equal to 1), activator activity at muM concentrations was exhibited only by compounds with n greater than 3. This, together with the results described above, indicates that for a compound R-Sn-R' (where R and R' are organic or inorganic groups) the only structural requirement for activity is n greater than or equal to 3. 4. Oxygenation of a semipanaerobic culture of R. spheroids for 1.5h before harvesting the cells produced a decrease of more than 90% in the cellular content of cystine trisulphide and glutathione trisulphides. 5. Chromatography on DEAE-Sephadex confirmed the presence of multiple forms of aminolaevulinate synthetase in extracts of R. spheroides [Tuboi et al. (1970) Arch. Biochem. Biophys. 138,147-154]. Oxygenation of a semi-anaerobic culture resulted in the disappearance of high-activity enzyme (a-form) and the accumulation of low-activity enzyme (b-form) in the cell. Spontaneous activation [Marriott et al. (1969) Biochem. J. 111,385-394] And activation by cystine trisulphide both resulted in the almost complete conversion of the b-form into the a-form.

Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon

2016 ◽  
Vol 111 ◽  
pp. 492-503 ◽  
Author(s):  
N.K. Pandey ◽  
Elizabeth Augustine ◽  
Remya Murali ◽  
N. Desigan ◽  
U. Kamachi Mudali ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Binary Mixture ◽  
Paraffin Hydrocarbon ◽  
Normal Paraffin ◽  
Kinetics Of

Removal of cesium from alkaline waste solution: Part I – Batch ion exchange study

2005 ◽  
Vol 93 (8) ◽  
Author(s):  
Kofi Adu-Wusu ◽  
Neguib M. Hassan ◽  
Charles A. Nash ◽  
James C. Marra
Keyword(s):  
Ion Exchange ◽  
Waste Solution ◽  
Exchange Study ◽  
Alkaline Waste

SummaryBatch ion exchange tests have been employed to evaluate the ability of SuperLig® 644 resin to remove

Equilibrium Study for the System Tri-n-butyl Phosphate, Normal Paraffin Hydrocarbon, and Nitric Acid

2011 ◽  
Vol 56 (6) ◽  
pp. 2856-2860 ◽  
Author(s):  
Shaila Lalkuwar Bajoria ◽  
Virendra Kisan Rathod ◽  
N. K. Pandey ◽  
U. Kamachi Mudali ◽  
R. Natarajan
Keyword(s):  
Nitric Acid ◽  
Paraffin Hydrocarbon ◽  
Normal Paraffin ◽  
Equilibrium Study

scholarly journals Resolution of myocardial phospholipase C into several forms with distinct properties

1983 ◽  
Vol 215 (2) ◽  
pp. 325-334 ◽  
Author(s):  
M G Low ◽  
W B Weglicki
Keyword(s):  
Ion Exchange ◽  
Phospholipase C ◽  
Gel Filtration ◽  
Maximal Activity ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Elution Profile ◽  
Close Correspondence ◽  
Molecular Weights ◽  
Low Activity

Phospholipase C activity capable of hydrolysing phosphatidylinositol in bovine heart was resolved into four forms (I-IV) by ion-exchange chromatography. Some of these forms could only be detected if the assay was performed at acidic pH (I and IV) or in the presence of deoxycholate (II). Gel-filtration chromatography indicated that the four forms had different molecular weights in the range 40000-120000. I, II and III all had pH optima in the range 4.5-5.5. However, the major form (III) also had substantial activity at pH 7.0 and above. The activities of I, II and III at pH 7.0 were stimulated by deoxycholate; this effect was most marked with I and II, which had very low activity at this pH. All forms of the enzyme were inhibited by EGTA and required 2-5 mM-CaCl2 for maximal activity. When the fractions eluted from the ion-exchange and gel-filtration columns were assayed with polyphosphoinositides as substrates there was a close correspondence to the elution profile obtained with phosphatidylinositol as substrate; there was no evidence for the existence in heart of phospholipase C activities specific for individual phosphoinositides.

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