Radiolysis of pentachlorophenol (PCP) in aqueous solution by gamma radiation

Phytotoxicity of herbicides in water was measured before and after exposure to gamma radiation from a60Co irradiator. Chromatographic methods and bioassays were used to measure alterations that occurred during60Co exposure. Phytotoxicity of picloram (4-amino-3,5,6-trichloropicolinic acid and trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) solutions was reduced even with the lowest dose of60Co, 1.7-megarad (Mrad). Alterations in phytotoxicity of atrazine (2-chloro-4-ethylamino-6-esopropylamino-s-triazine) and dicamba (3,6-dichloro-o-anisic acid) solution occurred only at 5 Mrad, which was the highest dose used. The phytotoxicity of atrazine solutons increased with the 5-Mrad irradiation. Thin layer chromatography (TLC) data showed that all herbicides were altered by60Co irradiation. Several products resulted when trifluralin was irradiated.

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The effect of gamma radiation on biodegradability of morpholine in aqueous solution

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/bf02166622 ◽

1986 ◽

Vol 107 (5) ◽

pp. 291-295 ◽

Cited By ~ 6

Author(s):

P. Tölgyessy ◽

M. Kollár ◽

D. Vančo ◽

M. Piatrik

Keyword(s):

Aqueous Solution ◽

Gamma Radiation

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The degradation, biodegradability and toxicity evaluation of sulfamethazine antibiotics by gamma radiation

Open Chemistry ◽

10.1515/chem-2020-0156 ◽

2020 ◽

Vol 18 (1) ◽

pp. 1188-1194

Author(s):

Yuankun Liu ◽

Jianlong Wang ◽

Zhiwei Zhou ◽

Xiaoying Zheng ◽

Liyuan Zhao ◽

...

Keyword(s):

Aqueous Solution ◽

Radiation Dose ◽

Gamma Radiation ◽

Absorbed Dose ◽

Order Kinetic ◽

Degradation Kinetic ◽

Intermediate Products ◽

Pharmaceutical Waste ◽

Biodegradation Process ◽

Pretreatment Technology

AbstractThis study evaluated gamma radiation-enhanced sulfamethazine (SMT) degradation, which belongs to the heterocyclic sulfonamides, in different conditions in aqueous solution. The results showed that gamma irradiation could increase the SMT removal in aqueous solution, and the SMT degradation kinetic follow the modified pseudo-first-order kinetic. The degradation rate was nearly 95% at the absorbed dose of 4 kGy. The removal of total organic carbon (TOC) and total nitrogen (TN) could be also induced. When the radiation dose was 5 kGy, the removal rates were only about 6.8% and 10.5% for TOC and TN, respectively. Some ions including HCOO−, CH3COO− and SO42− released during SMT degradation were studied. The biodegradability and toxicity of intermediate products of the SMT degradation were also proposed in this experiment. The biodegradability of the SMT can be improved by the intermediate products of SMT degradation at the radiation dose of 1, 2 and 5 kGy. Gamma radiation could be used as a pretreatment technology before the biodegradation process of pharmaceutical waste water.

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Tartrazine Solution as Dosimeter for Gamma Radiation Measurement

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.33.106 ◽

2014 ◽

Vol 33 ◽

pp. 106-117 ◽

Cited By ~ 4

Author(s):

Mohammed Gobara ◽

Ahmad Baraka

Keyword(s):

Aqueous Solution ◽

Gamma Radiation ◽

Low Dose ◽

Gamma Ray ◽

Ph Value ◽

Dose Range ◽

Radiation Measurement ◽

Factors Affecting ◽

Initial Ph ◽

Ph Increase

In this study, Tartrazine aqueous solution was investigated as a simple low-dose dosimeter in the range of 20-500 Gy for the high ionizing radiation, gamma ray. Gradual bleaching of Tartarzine solution was observed with dose by measuring the absorbance of Tartarzine-solutions at specified wavelength, λmax = 428 nm. Tartrazine concentration (10–4, 5 ×10–4 and 10–3 M) and solution-initial pH value (5, 7 and 9) were considered as factors affecting degree of bleaching. It was found that Tartarzine-solution color was diminished gradually with selected dose range due to breakdown of the azo bond. The rate of bleaching increases with the increase of solution-initial pH. Increase of Tartarzine-concentration causes widening of range to which solution is susceptible. The post-irradiated effect (24 hours) was found to cause more bleaching. The sensitivity of Tartrazine solution is not regular with the Tartarzine-concentration and regular with pH.

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Decomposition of diclofenac in sewage from municipal wastewater treatment plant using ionizing radiation

Nukleonika ◽

10.2478/nuka-2021-0029 ◽

2021 ◽

Vol 66 (4) ◽

pp. 201-206

Author(s):

Anna Bojanowska-Czajka

Keyword(s):

Aqueous Solution ◽

Wastewater Treatment ◽

Electron Beam ◽

Gamma Radiation ◽

Wastewater Treatment Plant ◽

Municipal Wastewater ◽

Treatment Plant ◽

Municipal Wastewater Treatment ◽

Municipal Wastewater Treatment Plant ◽

Complete Mineralization

Abstract The decomposition of diclofenac (DCF) in sewage sludge from municipal wastewater treatment plant was investigated. It was found that adsorption of DCF on sludge is about 40%. Compared to previous studies, where the degradation yield in aqueous solution was 100%, in those experiments at the dose up to 5 kGy, only 50% of initial DCF concentration of 50 mg L−1 was decomposed in sediment and in solution over the sediment. The experiments were carried out using both gamma radiation and electron beam. It has been observed that DCF in the aqueous phase, above the sediment, was decomposed with the same efficiency using both gamma radiation and electron beam. Whereas for DCF in the sediment, a higher degradation efficiency was found when gamma radiation was applied. This is most likely due to the limited penetration depth of the electron beam into the sludge layer. It was shown that the applied peroxide addition (in a stoichiometric amount needed for complete mineralization of 50 mg L−1 DCF) did not cause increase in yield of DCF decomposition.

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