Isolation of naturally occurring technetium

Kenna, B.T.; Kuroda, P. Κ.

doi:10.1016/0022-1902(61)80098-5

Cited by 61 publications

(17 citation statements)

References 12 publications

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“…The vibrational spectra of ditechnetiumdecacarbonyl indicate that its structure is very similar to that of Mn 2 (CO) 10 and Re 2 (CO) 10 , and X-ray studies confirm this conclusion [191 -193]. Tc 2 (CO)io consists of dimeric molecules of approximately D 4d symmetry in which each metal atom is octahedrally coordinated to five carbonyl groups and to the other metal atom such that the equatorial carbons are arranged in a staggered configuration [191].…”

Section: Carbonylsmentioning

confidence: 65%

“…Colourless crystals of Tc 2 (CO) 10 were prepared by reaction of Tc 2 0 7 with carbon monoxide at 275 °C under a pressure of 250 bar [189,190]. The vibrational spectra of ditechnetiumdecacarbonyl indicate that its structure is very similar to that of Mn 2 (CO) 10 and Re 2 (CO) 10 , and X-ray studies confirm this conclusion [191 -193].…”

Section: Carbonylsmentioning

confidence: 82%

“…99 Tc is formed by spontaneous fission of 238 U as well as [10] who isolated about 10~3 jug "Tc from 5.3 kg of pitchblende.…”

Section: Discovery and Occurrencementioning

confidence: 99%

“…Several heteronuclear technetium carbonyl compounds such as Mn Tc(CO) 10 , TcRe(CO) 10 [198], TcFe 2 (CO) 12 [199], and CoTc(CO), [200] have been synthesized and characterized.…”

Section: Carbonylsmentioning

confidence: 99%

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The Present Status of Technetium Chemistry

Schwochau

1983

Radiochimica Acta

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Technetium is the lightest artificial radioelement. Traces of "Tc occur in the earth's crust, weighable amounts are formed in high yield by the fission of 2 3 5 U. The laboratory handling of "Tc needs no special radiation protection. The chemical behaviour and the complex chemistry of the transition element resemble closely those of the homologous element rhenium. Some uses of technetium are demonstrated.

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Section: Carbonylsmentioning

confidence: 65%

Section: Carbonylsmentioning

confidence: 82%

“…99 Tc is formed by spontaneous fission of 238 U as well as [10] who isolated about 10~3 jug "Tc from 5.3 kg of pitchblende.…”

Section: Discovery and Occurrencementioning

confidence: 99%

“…Several heteronuclear technetium carbonyl compounds such as Mn Tc(CO) 10 , TcRe(CO) 10 [198], TcFe 2 (CO) 12 [199], and CoTc(CO), [200] have been synthesized and characterized.…”

Section: Carbonylsmentioning

confidence: 99%

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The Present Status of Technetium Chemistry

Schwochau

1983

Radiochimica Acta

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“…Tc is present in the environment, mainly as a result of anthropogenic activities, from the disposal of nuclear materials [1][2][3] and nuclear weapon fall out [4]; a small fraction of 99 Tc found in nature is also naturally occurring due to 238 U spontaneous fission [5][6][7]. This isotope represents a significant environmental contaminant because of its halflife of 2.1 × 10 5 y, complex chemistry, and potential high mobility.…”

Section: Introductionmentioning

confidence: 99%

Interactions of Tc(IV) with citrate in NaCl media

Wall¹,

Karunathilake²,

Dong³

2012

Radiochimica Acta

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Technetium / Citrate / Complexation / Solvent extraction / PHREEQCSummary. This paper presents the experimental determination of the stability constant for the citrate complexes with TcO(OH) + and TcO(OH) 2 0 at different ionic strengths (NaCl), using a solvent extraction method. Data show that the stability constants for the formation of TcO(OH)Cit 2− and TcO(OH) 2 Cit 3− are 10 7.5±0.2 and 10 2.8±0.2 , respectively, at zero ionic strength, with an average of 10 6.5±0.3 and 10 2.8±0.2 , respectively, in the 1.0-3.0 M ionic strength range. PHREEQC calculations based on these stability constants show that the TcO(OH)Cit 2− is the predominant species between pH 3 and 8 and that 50 mM citrate leads to a Tc(IV) solubility of 2 × 10 −5 M at pH 5.

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Technetium in Water

Clausen

2004

Water Encyclopedia

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Technetium, element 43, was predicted on the basis of its location in the periodic table. Twenty‐two isotopes of technetium whose masses range from 90 to 111 are known, and all are radioactive. Technetium has three long‐lived radioactive isotopes: technetium‐97 [ 97 Tc] (half‐life {T 1/2 } = 2.6 × 10 6 years), 98 Tc (T 1/2 = 4.2 × 10 6 years), and 99 Tc (T 1/2 = 2.13 × 10 5 years). An important isotope is 95m Tc (“m” stands for metastable state) [T 1/2 = 61 days], which is used in tracer work. However, the most useful isotope of technetium is 99m Tc (T 1/2 = 6.01 hours), which is used in many medical radioisotope tests because of its short half‐life, easy detection of the gamma ray it emits, and the ability of technetium to bind chemically to many biologically active molecules Technetium‐99 is a surface water and groundwater contaminant at a number of DOE sites such as the Paducah Gaseous Diffusion Plant (PGDP) in Paducah, Kentucky; the Portsmouth Gaseous Diffusion Plant in Piketon, Ohio; Currently, the largest annual release of 99 Tc to the environment occurs at the two nuclear fuel‐reprocessing facilities in Sellafield, United Kingdom. The most extensive groundwater distribution of 99 Tc is at the PGDP where a mile long plume of 99 Tc contaminated groundwater is commingled with the solvent trichloroethene. The 99 Tc was introduced to the site during the 1970s when fissioned uranium was reprocessed. The technologies explored for remediating 99 Tc in water include ion exchange, liquid–liquid extraction, precipitation with various forms of iron, redox manipulation, the FORAGER sponge, granular activated carbon (GAC), and natural attenuation.

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Isolation of naturally occurring technetium

Cited by 61 publications

References 12 publications

The Present Status of Technetium Chemistry

The Present Status of Technetium Chemistry

Interactions of Tc(IV) with citrate in NaCl media

Technetium in Water

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