Alizarin complexone dye solutions for radiation dosimetry

El-Assy, N. B.; Ibrahim, I. A.; Abdel-Fattah, A.T.; Ahmed, Fayzan

doi:10.1007/bf02035669

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…The general trend for the degradation process is as follows: the percent degradation is the highest for the lowest dose rate (0.3 Gy sl), followed by dose rate 0.6 Gy s 1 and the dose rate 1.2 Gy s 1 showed a lower degradation percent. This behavior is expected and is in good agreement with reported results [10][11][12][13]. The pH influence has proved to vary according to the type of the pesticide.…”

Section: Radiation Degradation Of Pesticidessupporting

confidence: 89%

“…In most cases the radiation degradation of the pesticides was higher in the acidic medium followed by that in neutral medium and the degradation carried out in alkaline medium proceeded in the least degree. The irradiation of the pesticide solutions with gamma radiation leads to the formation of radicals and molecular products formed from the radiolysis of water [12][13][14]. According to Suzuki et al [15,16] who reported that in addition to the primary OH radicals, these species (HO2 and 02) contribute to the degradation process and that this process in the presence of oxygen leads to the formation of peroxides which contribute also to the degradation reactions.…”

Section: Radiation Degradation Of Pesticidesmentioning

confidence: 98%

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The use of gamma radiation for removal of pesticides from waste water

1999

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In the present study, a try was made to explain the degradation kinetics due to irradiation of aqueous solutions of some active ingredient pesticides. These pesticides are as follows: one type of triazine herbicide Ametryn and one type of carbamate insecticide (Applaud) and two types of chlorinated organic pesticides, Aldrin and Chlorothalonil. Factors affecting the radiolysis of these pesticides such as the pesticide concentration, irradiation dose, dose rate and pH of the solutions were studied. Ametryn, Applaud, Chlorothalonil and Aldrin insecticides were degraded by Tradiation and in the case of the chlorinated pesticides hydrochloric acid was detected. The pH effect has proved to vary according to the type of the pesticide and little degradation was observed in alkaline medium, while more degradation of the pesticides in the neutral medium was observed depending on the type of pesticide and on its chemical structure. However, the degradation in the acid medium was even higher. A drop in pH was observed and may be attributed to the degradation of the pesticide molecules to lower molecular weight compounds, such as organic acids. A combined treatment of gamma irradiation and conventional methods was applied and the effect of different additives such as nitrogen and oxygen showed that nitrogen did not enhance the degradation, while an enhancement in the degradation process was observed when oxygen was added. Experiments on the adsorption of these pesticides on certain polymeric materials and on Granular Activated Carbon (GAC), showed that GAC has the highest adsorption capacity. It may be concluded that the radiation degradation followed by adsorption of the toxic pesticide pollutants and their removal from wastewater down to concentrations not exceeding the maximum permissible concentration (MPC), according to international standards, proved to be better than the conventional methods of purification.

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Section: Radiation Degradation Of Pesticidessupporting

confidence: 89%