Abstract
This paper summarizes the results of a series of studies on the various factors that affect the leaching of lead from unplasticized poly(vinyl chloride) (UPVC) pipes. Factors that were studied include temperature, pH and extractants. Results showed that, for a given UPVC pipe, the rate of leaching of lead depended primarily on temperature and the nature of extractants. While the rate of leaching of lead was quite low with distilled water, it was very much enhanced by the presence of low concentration of anions such as C1-, HPO4 2- HCO3 -, NO3 -, SO4 2- and EDTA. EDTA, being a strong complexing agent, was most effective. Rates of leaching were found to be higher at elevated temperature except in the cases of HPO4 2- and EDTA. Effect of pH was not pronounced. The temperature at which the UPVC pipes were extruded was found to affect the rate of leaching of lead. Pipes extruded at 190°C were found to have lower rate of leaching than those extruded at 180°C and 170°C. Analysis of the pipes by Scanning Electron Micrascopy showed that the distribution of lead in the pipes extruded at 190°C was more uniform than those extruded at 170°C.
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References
Cosoveanu, G.: 1967, ‘Toxicity of PVC Pipes made in Rumania and their Use in Potable Water Installation’, Mater. Plast. 4, 30–33.
Gross, R.C., Engelbart, B. and Walter, S.: 1974, ‘Aqueous Extraction of Lead Stabilizers from PVC Compounds’, Soc. Plast. Engng. Tech. Pap. 20, 529–531.
Niklas, H. and Meyer, W.: 1961, The Migration of Lead from Stabilized PVC Pipes’, Kunstoffe 51, 2–6.
Packham, R.F.: 1987a, ‘The Leaching of Toxic Stabilizers from Un plasticized PVC Water Pipe: Part I-A Critical Study of Laboratory Test Procedures’, Wat. Treat. Exam. 20, 108–124.
Packham, R.F.: 1971b, ‘The Leaching of Toxic Stabilizers from Unplasticized PVC Water Pipe: Part II-A Survey of Lead Levels in UPVC Distribution Systems’, Wat. Treat. Exam. 20, 144–151.
Packham, R.F.: 1971c, ‘The Leaching of Toxic Stabilizers from Unplasticized PVC Water Pipe: Part III-The Measurement of Extractable Lead in UPVC Pipes’, Wat. Treat. Exam. 20, 152–161.
Wong, M.K., Gan, L.M., Koh, L.L., Tan, C.K. and Tong, P.H.: 1984, ‘Leaching of Lead from Poly(vinyl chloride) Pipes for Potable Water Conveyance’, Proceedings of Third Symposium on Our Environment‘, pp. 107–115, Singapore.
Wong, M.K., Gan, L.M. and Koh, L.L.: 1988, ‘Temperature Effects on the Leaching of Lead from Unp1asticized Poly(vinyl chloride) Pipes’, Wat. Res. 22, 1399–1403.
Wong, M.K., Gan, L.M., Koh, L.L. and Lum, O.L.: 1990, ‘Some Further Studies on Factors affecting the Leaching of Lead from Poly (vinyl chloride) Pipes’, Wat. Res. 24, 451–455.
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© 1991 Springer Science+Business Media Dordrecht
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Koh, L.L., Wong, M.K., Gan, L.M., Yap, C.T. (1991). Factors Affecting the Leaching of Lead from UPVC Pipes. In: Lee, H.K. (eds) Fourth Symposium on our Environment. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2664-9_21
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DOI: https://doi.org/10.1007/978-94-011-2664-9_21
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5178-1
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