612
S. Kinoshita and T. Sunada
Fen ton's reagent
To water containing 100 ppb of PCB, Fenton's reagent which gave a concentration of
30 ppm of ferrous sulphate and 10 ppm of hydrogen peroxide and sulfuric acid which
gave the final pH of 3.0 were added and the mixture was stirred gently for half an hour.
The mixture was allowed to stand for 24 hours, extracted with n-hexane and the residual
PCB was analyzed. The reduction of PCB was found to be 42%.
CONCLUSION
PCB in aqueous microparticulate colloidal solution is destroyed by ionizing radiation,
but its resistance to radiation is far more than other chlorinated hydrocarbons such as
pentachlorophenol (3) or DDT (7) and other pesticides such as parathion (2). This may
seem to be a weakness in using radiation treatment for polluted water, but the proposed
radiation treatment generally consists of several procedures such as irradiation,
sedimentation by coagulation, filtration and postchlorination. Conventional treatment by
sedimentation with coagulation can so effectively treat PCB in water that the proposed
radiation treatment would result in thorough removal. Acute toxicity of irradiated PCB
solution is found to be far less than the non-irradiated solution for striped shrimps,
and the products of irradiation show reduced toxicity.
ACKNOWLEDGEMENT
Thanks are given to Mr. M. Kinoshita and Mr. N. Kato for assistance and to
Kanegafuchi Chemical Ind. Co. for samples of "Kanechlor".
REFERENCES
1 SUNADA, T. TANITO, K. and KATO, N., J. Food Irradiation (Japanese ed.), 2 (1); 126 (1967).
2 SUNADA, T. and TANITO, K., ibid., 3 (1); 111 (1968).
3 SUNADA, T., Soda and Chlorine, 20 (4); 123 (1969).
4 SUNADA, T., Nuclear Engineering, 16 (11); 68 (1970).
5 RISEBROUGH, R.W., RIECHE, P., PEAKALL, D.B., HERMAN, S.G. and KIRVEN, M.N., Nature,
220; 1098 (1968).
6 JENSEN, S., JOHNELS, A.G., OLSSON, M. and OTTERLIND, G., Nature, 224; 247 (1969).
7 SHERMAN, W.V., EVANS, R., NESYTO, E. and RADLOWSKI, C , Nature, 232; 118 (1971).
S. Kinoshita and T. Sunada
Fen ton's reagent
To water containing 100 ppb of PCB, Fenton's reagent which gave a concentration of
30 ppm of ferrous sulphate and 10 ppm of hydrogen peroxide and sulfuric acid which
gave the final pH of 3.0 were added and the mixture was stirred gently for half an hour.
The mixture was allowed to stand for 24 hours, extracted with n-hexane and the residual
PCB was analyzed. The reduction of PCB was found to be 42%.
CONCLUSION
PCB in aqueous microparticulate colloidal solution is destroyed by ionizing radiation,
but its resistance to radiation is far more than other chlorinated hydrocarbons such as
pentachlorophenol (3) or DDT (7) and other pesticides such as parathion (2). This may
seem to be a weakness in using radiation treatment for polluted water, but the proposed
radiation treatment generally consists of several procedures such as irradiation,
sedimentation by coagulation, filtration and postchlorination. Conventional treatment by
sedimentation with coagulation can so effectively treat PCB in water that the proposed
radiation treatment would result in thorough removal. Acute toxicity of irradiated PCB
solution is found to be far less than the non-irradiated solution for striped shrimps,
and the products of irradiation show reduced toxicity.
ACKNOWLEDGEMENT
Thanks are given to Mr. M. Kinoshita and Mr. N. Kato for assistance and to
Kanegafuchi Chemical Ind. Co. for samples of "Kanechlor".
REFERENCES
1 SUNADA, T. TANITO, K. and KATO, N., J. Food Irradiation (Japanese ed.), 2 (1); 126 (1967).
2 SUNADA, T. and TANITO, K., ibid., 3 (1); 111 (1968).
3 SUNADA, T., Soda and Chlorine, 20 (4); 123 (1969).
4 SUNADA, T., Nuclear Engineering, 16 (11); 68 (1970).
5 RISEBROUGH, R.W., RIECHE, P., PEAKALL, D.B., HERMAN, S.G. and KIRVEN, M.N., Nature,
220; 1098 (1968).
6 JENSEN, S., JOHNELS, A.G., OLSSON, M. and OTTERLIND, G., Nature, 224; 247 (1969).
7 SHERMAN, W.V., EVANS, R., NESYTO, E. and RADLOWSKI, C , Nature, 232; 118 (1971).