Spectrophotometric determination of uranium and thorium with arsenazo

Holcomb, H.P.; Yoe, John H.

doi:10.1016/0026-265x(60)90027-8

Cited by 18 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concentrations of U (VI) and Th (IV) in the sample solutions were determined by measuring absorbance at 665 and 655 nm with Shimadzu model 160A double-beam UV spectrophotometer using arsenazo III as color producing reagents [9]. The concentration of uranium and thorium in mixture was determined by arsenazo I method [10]. This method depends on that thorium form a complex with arsenazo I with maximum at 565 nm when pH of the solution is within the range 1.0-2.3, while uranium will not interfere with thorium at this pH.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of uranium by low-cost adsorbent derived from agricultural wastes in multi-component system

Yakout

Rizk

2015

Desalination and Water Treatment

View full text Add to dashboard Cite

A B S T R A C TThe impact of common cations and anions on the adsorption of uranium on rice straw activated carbon has been examined. The presence of these ions in solution was found to inhibit the uptake of cadmium by chitin to different degrees. Presence of Fe ions depressed the uranium removal to 77 and 20% at 20 and 100 mg/l, respectively. Coexistence of some anions induced small positive effect on uranium adsorption percent like Cl -; 91.0%, CO 2À 3 ; 89.3%, HCO À 3 ; 88.8%, S 2 O 2À 3 ; 93.8%, and OH -; 91.6% compared to 84.2% uranium removal. Simultaneous presence of both uranium and thorium reduced uranium sorption from 100 to 35.9 mg/g. Data were good fitted by the Langmuir isotherm with correlation coefficient higher than 0.998. This means, the adsorption is monolayer chemical in nature on homogenous surface.

show abstract

Section: Methodsmentioning

confidence: 99%

Adsorption of uranium by low-cost adsorbent derived from agricultural wastes in multi-component system

Yakout

Rizk

2015

Desalination and Water Treatment

View full text Add to dashboard Cite

show abstract

“…The concentration of uranium and thorium in mixture was determined by Arsenazo I method [14]. In this method, thorium forms a complex with Arsenazo I at λ = 565 nm, when pH of the solution is within the range 1.0-2.3 while uranium does not interfere with thorium at this pH.…”

Section: Analytical Measurementsmentioning

confidence: 99%

Adsorption of uranium in the presence of different ions, humic acid and effect of thorium on uranium adsorption by activated carbon

Yakout

Abdeltawab

2015

Desalination and Water Treatment

View full text Add to dashboard Cite

In this study, rice straw-based carbon was prepared and then modified by two acidic and basic oxidizing agents. One oxidized by HNO 3 , labeled as RSN, and other oxidized by KOH labeled as RSK. The modified carbons (RSN and RSK) were tested in two single-component systems: Removal of U(VI) using RSK and Th(IV) using RSN. Factors affecting U(VI) in three multi-component systems were examined: (i) Co-existing anions and cations, (ii) co-existing Th(IV), and (iii) presence of humic acid (HA). In this concern, different cations under investigation have marginal effect on the adsorption of uranium, except in case of iron ion. Co-existing of iron ions at high levels may compete strongly for the adsorption sites with uranium ions, resulting in a substantial reduction of uranium removal. The prepared carbon showed good selectivity in extracting uranium even in the presence of relatively high concentrations (100 mg/l) of anionic complexing agents and common electrolyte species. In case of multi-component system U(VI)/Th(IV), the capacity of each metal was reduced due to the competition between two ions for sorption sites on carbon surface. In presence of HA, the metal-humic interactions play a very important role in determining the extent of adsorption. It is concluded that multi-species adsorption can be significantly affected by adsorbate interactions and the understanding of these interactions needs great attention in adsorption study in the future.

show abstract

“…HI-ethyl ether system (570) and the Cdli-HI-ethyl ether systems (435) have been determined. Tin(IV) may be effectively extracted as Snl4 from high HI concentration into benzene (180). The addition of KI to a dilute HN03 solution of Hg, Bi, Cd, In, and Zn serves successively to extract these elements into cyclohexanone or TBP; similarly anions such as I-, Br-, and Clcan be extracted with Hgl2 (211).…”

Section: Ion Association Systemsmentioning

confidence: 99%