Environmental Monitoring and Assessment

, Volume 15, Issue 1, pp 59–82

Causes of temporal variability of lead in domestic plumbing systems

  • Michael R. Schock

Abstract

Sources of lead in drinking water are primarily lead pipe, lead/tin solder, and brass fixture materials.

Lead levels in the water depend upon many solubility factors, such as pH, concentrations of substances such as inorganic carbonate, orthophosphate, chlorine, and silicate, the temperature, the nature of the pipe surface, etc. Physical factors, time, and chemical mass transfer are significant in governing lead levels in nonequilibrium systems. The diameter and length of lead pipe is extremely important, as well as the age and chemical history of the solder and brass fixtures. Analytical variability is not particularly significant relative to between-site and within-site variability. Knowledge of temporal variability at each site is necessary to define a statistically valid monitoring program. An analysis of published data covering repetitive measurements at a given site show that the variability of lead concentration at each site tends to be characterized by the frequent occurrence of ‘spikes’. Variability expressed as approximate relative standard deviations tends to be of about 50 to 75% in untreated water, regardless of the mean lead concentration. The distributions are frequently nonnormal for small numbers of samples. Monitoring programs must incorporate controls for the causes of the within-site and between-site variability into their sampling design. The determination of necessary sampling frequency, sample number, and sample volume must be made with consideration of the system variability, or the results will be unrepresentative and irreproducible.

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References

  1. American Chemical Society Committee on Environmental Improvement: 1983, ‘Principles of Environmental Analysis’, Analytical Chemistry 55, 14, 2210.Google Scholar
  2. American Society for Testing and Materials: 1983, ‘Standard Practice for Intralaboratory Quality Control Procedures and a Discussion on Reporting Low-Level Data’, Annual Book of ASTM Standards, Vol. 11.01, D4210–83.Google Scholar
  3. Ahmadi, A. B.: 1981, ‘Effects of Water Quality Parameters on Corrosion of Mild Steel, Copper and Zinc’, Ph.D. Dissertation, University of Florida, Gainesville.Google Scholar
  4. Bailey, R. J. et al.: 1986, ‘Lead Concentration Tid Stagnation Time in Water Drawn Through Lead Domestic Pipes’, Water Research Centre Technical Report TR 243.Google Scholar
  5. Bailey, R. J. and Russel, P. F.: 1981, ‘Predicting Drinking Water Lead Levels’, Environ. Technol. Letters 2, 57.Google Scholar
  6. Birden, H. H. Jr. et al.: 1985, ‘Lead Dissolution from Soldered Joints’, Jour. AWWA 77, 11, 66.Google Scholar
  7. Britton, A. end Richards, W. N.: 1981, ‘Factors Influencing Plumbosolvency in Scotland’, Jour. Inst. Water Engr. and Scientists 35, 4, 349.Google Scholar
  8. Cox, D. D.: 1988, ‘Personal Communication’, University of Illinois Statistics Office, Champaign, Illinois.Google Scholar
  9. Gregory, R. and Jackson, P. J.: 1984, ‘Central Water Treatment to Reduce Lead Solubility’, Proc. AWWA Annual Conf., Dallas, TX, June.Google Scholar
  10. James M. Montgomery, Consulting Engineers, Inc.: 1983, Internal Corrosion Mitigation Study Addendum Report, Prepared for the Bureau of Water Works, Portland, OR.Google Scholar
  11. Karalekas, P. C. Jr. et al.: 1976, ‘Lead and Other Trace Metals in Drinking Water in the Boston Metropolitan Area’, Jour. NEWWA 90, 150.Google Scholar
  12. Karalekas, P. C. Jr. et al.: 1983, ‘Control of Lead, Copper, and Iron Pipe Corrosion in Boston, Jour. AWWA 75, 2, 92.Google Scholar
  13. Keller, B.: 1987, ‘Personal Communication’, Analytical Chemistry Laboratory Unit, Illinois State Water Survey, Champaign, Illinois.Google Scholar
  14. Kuch, A. and Wagner, I.: 1983 ‘A Mass Transfer Model to Describe Lead Concentrations in Drinking Water’, Water Res. 17, 10, 1303.Google Scholar
  15. Lacey, R. F. and Jolly, P. K.: 1986, ‘Sampling for Household Water-Lead’, Water Research Centre Technical Report tr 244.Google Scholar
  16. Lyon, T. D. B. and Lenihan, J. M. A.: 1977, ‘Corrosion in Solder Jointed Copper Tubes Resulting in Lead Contamination of Drinking Water’, Br. Corros. Jour. 12, 1, 41.Google Scholar
  17. Mattsson, E.: 1980, ‘practical Experience in Relation to Basic Data’, Br. Corros. Jour. 15, 1, 6.Google Scholar
  18. Miller, I. and Freund, J. E.: 1985, ‘Probability and Statistics for Engineers’, Third Edition, Prentice-Hall, Inc., Englewood Cliffs, NJ.Google Scholar
  19. Moore, M. R.: 1973, ‘Plumbosolvency of Waters’, Nature 243, 222.Google Scholar
  20. Murrell, N. E.: 1985a, ‘Summary of Impact of Metallic Solders on Water Quality’, Plumbing Materials and Drinking Water Quality, Proceedings of a Seminar, Cincinnati, Ohio, May 16–17, EPA 600/9-85/007.Google Scholar
  21. Murrell, N. E.: 1985b, ‘Impact of Lead Solder and Lead Pipe on Water Quality’, 1985 Annual Conference Proceedings, Washington, D.C., June 1985, American Water Works Association.Google Scholar
  22. Neff, C. H., Schock, M. R., and Marden, J. I.: 1987, ‘Relationships Between Water Quality and Corrosion of Plumbing Materials in Buildings’, Project Report for Grant No. CR80856010, USEPA, EPA/600/S2-87/036.Google Scholar
  23. Oliphant, R.: 1978, ‘Dezincification of Potable Water of Domestic Plumbing Fittings: Measurement and Control’, Water Research Centre Technical Report TR88.Google Scholar
  24. Oliphant, R.: 1983, ‘Summary Report on the Contamination of Potable Water by Lead from Soldered Joints’, Water Research Centre External Report 125E.Google Scholar
  25. Patterson, J. W., and O'Brien, J. E.: 1979, ‘Control of Lead Corrosion’, Jour. AWWA 71, 5, 264.Google Scholar
  26. Richards, W. N. et al.: 1980, ‘Reducing Plumbosolvency—The Effect of Added Lime on the Loch Katrine Supply to Glasgow’, Jour. Inst. Water Engr. and Scientists 34, 4, 315.Google Scholar
  27. Schaut, G. C.: 1942, ‘The Action of a Chlorinated Water Supply Upon Lead Pipe’, Amer. Jour. Pharm.,2441–249.Google Scholar
  28. Schlotzhauer, S. D. and Littell, R. C.: 1987, SAS System for Elementary Statistical Analysis, SAS Institute Inc., Cary, NC.Google Scholar
  29. Schock, M. R.: 1980, 1981, ‘Response of Lead Solubility to Dissolved Carbonate in Drinking Water’, Jour. AWWA 72, 12, 1695, 73, 3, 36 [News].Google Scholar
  30. Schock, M. R. and Gardels, M. C.: 1983, ‘Plumbosolvency Reduction by High pH and Low Carbonate-Solubility Relationships’, Jour. AWWA 75, 2, 87.Google Scholar
  31. Schock, M. R. and Neff, C. H.: 1988, ‘Trace Metal Contamination from Brass Fittings’, Jour. AWWA 80, 11, 47.Google Scholar
  32. Schock, M. R. and Wagner, I.: 1985, ‘The Corrosion and Solubility of Lead in Drinking Water’, Chapter 4 in Internal Corrosion of Water Distribution Systems, AWWARF/DVGW-Forschungsstelle Cooperative Research Report.Google Scholar
  33. Schock, M. R., Levin, R., and Cox, D. C.: 1988, ‘The Significance of Sources of Temporal Variability of Lead in Corrosion Evaluation and Monitoring Program Design’, Proc. AWWA WQTC, St. Louis, MO, Nov.Google Scholar
  34. Sharrett, A. R. et al.: 1982, ‘Daily Intake of Lead, Cadmium, Copper, and Zinc from Drinking Water: The Seattle Study of Trace Metal Exposure’, Envir. Res. 28, 456.Google Scholar
  35. Snoeyink, V. L. and Jenkins, D.: 1980, Water Chemistry, John Wiley and Sons, New York, 463 pp.Google Scholar
  36. Taylor, J. K.: 1987, Quality Assurance of Chemical Measurements, Lewis Publishers.Google Scholar
  37. Treweek, G. P. et al.: 1985, ‘Pilot-Plant Simulation of corrosion in Domestic Pipe Materials’, Jour. AWWA 77, 10, 74.Google Scholar
  38. Walker, G. D.: 1977, ‘An SEM and Microanalytical Study of In Service Dezincification of Brass’, NACE Corrosion 33, 7.Google Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Michael R. Schock
    • 1
  1. 1.Aquatic Chemistry SectionIllinois State Water SurveyChampaignUSA

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