Brass Fittings - A Source of Lead in Drinking Water?
This study investigated the contribution to lead in drinking water from typical brass fittings found between the water main and the kitchen tap. Fittings and circumstances that have the greatest potential to give rise to elevated concerntrations of lead in drinking water have been assessed through a combination of literature analysis, engagement with water companies and fittings manufacturers, laboratory stagnation tests and longer term field trials. The latter comprised deployment of test rigs containing a selection of high and low lead brass fittings at two water treatment works to compare leaching in hard and soft water, with and without phosphate dosing.
The practical studies showed that new brass fitiings leached lead at concentrations that could contribute significantly towards total lead in drinking water at the tap. However lead concentrations fell over a few weeks even in the non-phosphate dosed waters. It was also observed that there was often variation in the amount of lead that leached from the same type of fitting, lead leaching was higher in soft water, that low lead brasses leach less lead, and that phosphate dosing significantly reduces lead leaching.
The information will assist in developing strategies for the water industry and regulators to continue reducing lead levels in drinking water.
|UKWIR Reference :- 14/DW/04/14||Published Date :- 25/02/2014|
|Retail Price (£) :- 45||ISBN :- 1 84057 715 0|