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Impact of Sodium Silicate on Lead Release and Colloid Size Distributions in Drinking Water by Bofu Li; Benjamin F. Trueman; Sebastian Munoz; Javier M. Locsin; Graham A. Gagnon is a Environmental Science article available to read on EtoBox.

What is Impact of Sodium Silicate on Lead Release and Colloid Size Distributions in Drinking Water about?

Sodium silicates have been used in drinking water treatment for decades as sequestrants and corrosion inhibitors. For the latter purpose they are poorly understood, which presents a potential public health risk. We investigated a common sodium silicate formulation as a treatment for lead release and compared it to orthophosphate, a well-established lead corrosion control treatment. We also compared the size distributions of colloids generated in silicate and orthophosphate-treated systems using field flow fractionation with multielement detection. At a moderate dose of 24 mg SiO/L, sodium silicate yielded a median lead release of 398 μg/L, while orthophosphate yielded 67 μg Pb/L. At an elevated dose of 48 mg SiO/L, sodium silicate dispersed corrosion scale in cast iron pipe sections and lead service lines, resulting in a substantial release of colloidal iron and lead. In the silicate-treated system, a silicon-rich coating occurred at the lead-water interface, but lead carbonate remained the major corrosion product and appeared to control lead levels. These data suggest that, as a corrosion control treatment for lead, sodium silicate is inferior to orthophosphate in circumneutral pH

Who reads Impact of Sodium Silicate on Lead Release and Colloid Size Distributions in Drinking Water?

Author

Bofu Li; Benjamin F. Trueman; Sebastian Munoz; Javier M. Locsin; Graham A. Gagnon

Publisher

IWA Publishing; Elsevier ; Elsevier BV (ISSN 0043-1354)

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)