Evaluation of lead release in a simulated lead-free premise plumbing system using a sequential sampling approach
Journal
International Journal of Environmental Research and Public Health
Journal Volume
13
Journal Issue
3
Pages
-
Date Issued
2016
Author(s)
Abstract
In this pilot study, a modified sampling protocol was evaluated for the detection of lead contamination and locating the source of lead release in a simulated premise plumbing system with one-, three- and seven-day stagnation for a total period of 475 days. Copper pipes, stainless steel taps and brass fittings were used to assemble the “lead-free” system. Sequential sampling using 100 mL was used to detect lead contamination while that using 50 mL was used to locate the lead source. Elevated lead levels, far exceeding the World Health Organization (WHO) guideline value of 10 μg. L-1, persisted for as long as five months in the system. “Lead-free” brass fittings were identified as the source of lead contamination. Physical disturbances, such as renovation works, could cause short-term spikes in lead release. Orthophosphate was able to suppress total lead levels below 10 μg. L-1, but caused “blue water” problems. When orthophosphate addition was ceased, total lead levels began to spike within one week, implying that a continuous supply of orthophosphate was required to control total lead levels. Occasional total lead spikes were observed in one-day stagnation samples throughout the course of the experiments. © 2016 by the authors;.
Subjects
Brass; Copper; Corrosion; Orthophosphate; Sampling protocol
Other Subjects
copper; lead; phosphate; stainless steel; water; brass; drinking water; lead; water pollutant; zinc; brass; copper; corrosion; lead; orthophosphate; sampling; Article; controlled study; pH; pilot study; plumbing system; pollution transport; simulation; tube; water contamination; water management; water sampling; analysis; chemistry; corrosion; devices; environmental monitoring; sanitation; standards; water pollutant; water supply; Copper; Corrosion; Drinking Water; Environmental Monitoring; Hydrogen-Ion Concentration; Lead; Phosphates; Pilot Projects; Sanitary Engineering; Water Pollutants, Chemical; Water Supply; Zinc
Type
journal article