Reduction behaviors of permanganate by microbial cells and concomitant accumulation of divalent cations of Mg, Zn+, and Co

Kato, Tomoaki*; Yu, Q.*; Tanaka, Kazuya; Kozai, Naofumi; Saito, Takumi*; Onuki, Toshihiko

Journal of Environmental Sciences, 86, p.78 - 86, 2019/12

https://doi.org/10.1016/j.jes.2019.05.007

This paper investigated the fate of the dissolved permanganate in aqueous solution after contact with bacterial cells and metal accumulation during precipitation of Mn oxides. When Mn(VII) was contacted with bacterial cells, cells were damaged and Mn(VII) was reduced by cells to lower valence and precipitated as Mn oxides (biomass Mn oxides). When Co ions were present, Co was incorporated into Mn oxides as Co. These results suggest that Mn(VII) can be used to remove metal ions when introduced to wastewater as disinfectant.

An Analytical method of low-level radium isotopes in freshwater sample by -ray spectrometry; Application of pre-concentration from large volume of water sample using Powdex resin and barium sulfate coprecipitation of radium isotopes

Tomita, Jumpei; Abe, Takuya

JAEA-Research 2016-026, 12 Pages, 2017/03

JAEA-Research-2016-026.pdf:1.15MB

An analytical method of low-level Ra isotopes in freshwater samples with combination of pre-concentration from large volume of water sample (170 L) using Powdex resin and -ray spectrometry followed by simple coprecipitation of Ra was developed. pre-concentration of Ra by batch method using Powder resin was examined, and it was shown that the amount of the resin required collecting Ra in the water sample could be determined by measuring the electric conductivity (EC) of water sample. It was found that coprecipitation of Ra with barium sulfate could remove more than 96% of potassium that increases the background. The validation of this method was confirmed by the analyses of 170 L of water sample containing the known amount of Ra isotopes with different EC. Among the analyses, the recovery of Ra was 98% in average and detection limits of Ra and Ra were achieved to be approximately 0.3 and 0.5 mBq L, respectively.

Evaluation of operatinal condition in LWTF; Tests using technical scale equipment

; Murata, Eiichi*; Sawahata, Yoshikazu*; Saito, Akira*

JNC TN8430 2001-002, 43 Pages, 2001/02

JNC-TN8430-2001-002.pdf:1.98MB

Japan Nuclear Cycle Development Institute (JNC) is designing the Low level radioactive Waste Treatment Facility (LWTF) in the Tokai Reprocessing Plant (TRP). The low level liquid waste generated the TRP is separated salt (NaNO, etc) and radionuclide in liquid treatment process of LWTF. The process can get higher volume reduction than previous bituminization. Based on the engineering tests equal to the liquid treatment process of LWTF, the validity of operational condition in LWTF is evaluated. As the results, it is confirmed that all operational condition in the processes which is Iodine immobilization, Pre-filter filtration, Pre-treatment, Coprecipitation and Ultrafiltration are available.

TRU separation from the phosphoric acid waste in submerged combustion process of spent solvent in reprocessing

Uchiyama, Gunzo; Maeda, Mitsuru; Fujine, Sachio; *

ICEM 95: Proc. of 5th Int. Conf. on Radioactive Waste Management and Environmental Remediation,Vol. 1, 0, p.403 - 407, 1995/00

no abstracts in English

A Radioanalytical Method for Samarium-151 and Promethium-147in Environmental Samples

Sumiya, Shuichi; Hayashi, Naomi; ; Narita, Osamu

PNC TN8430 91-001, 45 Pages, 1990/12

PNC-TN8430-91-001.pdf:0.85MB

A radioanalytical method for low level samarium-151(Sm-151) and promethium-147(Pm-147) in environmental samples has been studied for the environmental assessment around nuclear facilities. In this study, we use the separation method with high performance liquid chromatography (HPLC) to determine Sm-151 and Pm-147 in environmental samples such as sea sediments and marine organisms. Samarium-151 and Pm-147 in environmental samples are coprecipitated with other lanthanoids after adding neodymium(Nd). These nuclides are purified by anion exchange methods in methanol-mineral acid media. After the purification, Sm-151 and Pm-147 are separated with HPLC in lactic acid-sodium hydroxide media, and determined with liquid scintillation counting, respectively. The Nd is determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) to correct chemical recoveries of these nuclides. The detection limits for Sm-151 and Pm-147 in this method are about 0.01Bq/sample.

Simultaneous deterimination of neptunium, plutonium, americium and curium using coprecipitation with bismuth phosphate

Kimura, Takaumi

Journal of Radioanalytical and Nuclear Chemistry, 139(2), p.297 - 305, 1990/00

https://doi.org/10.1007/BF02061815

no abstracts in English

Determination of alpha emitters in combustible solid materials

;

Journal of Radioanalytical and Nuclear Chemistry, 94(6), p.381 - 390, 1985/00

https://doi.org/10.1007/BF02165699

no abstracts in English

Separation of Pu-Am from the leachant of a deposit in an acid digestion solution by calcium-oxalate coprecipitation

; ; ; ;

Sep.Sci.Technol., 18(2), p.177 - 186, 1983/00

https://doi.org/10.1080/01496398308055667

no abstracts in English

Recovery of Pu and Am from alpha-bearing aqueous wastes, 3

Radiochem.Radioanal.Lett., 19(1), p.33 - 42, 1974/01

no abstracts in English

Sorption of Sr into Mn oxides produced by MnO reduction using biomass

Kato, Tomoaki; Onuki, Toshihiko; Yu, Q.

no journal, , 

Various radionuclides were released into seawater by the accident of the Fukushima Daiichi Nuclear Power Plant. We need to establish techniques to eliminate such radionuclides from the contaminated seawater. Mn oxides are known to sorb various metal ions. Mn oxides can be produced by reduction of MnO using biomass (biomass-MnOX) although there is little information on metal uptake mechanisms during the formation of biomass-MnOX. In this research, we investigated the uptake of Sr during the formation of biomass-MnOX produced by reduction of KMnO with cells of Pseudomonas fluorescens. After inoculating the cells into the Mn(VII) and Sr containing solution, blackish precipitates were formed in the bottom. EXAFS analysis of Sr in the precipitates showed that the presence of Mn around Sr, indicating that Sr was formed inner-sphere complex with Mn during coprecipitation.