Effects of orthophosphate corrosion inhibitor on lead in blended water quality environments

    Authors

    E. D. Stone; S. J. Duranceau; P. A. Lintereur;J. S. Taylor

    Comments

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    Abbreviated Journal Title

    Desalin. Water Treat.

    Keywords

    Lead release; Orthophosphate corrosion inhibitor; Blended source water; Distribution system water quality; PHOSPHATE; Engineering, Chemical; Water Resources

    Abstract

    This study evaluated the effects of orthophosphate (OP) inhibitor addition on corrosion of lead/tin coupons exposed to different blends of groundwater, surface water, and desalinated seawater. Four different doses of OP inhibitor, from zero (control) to 2 mg/L as P, were investigated and non-linear empirical models were developed to predict lead release from water quality and OP doses. Surface characterization evaluations were conducted using X-ray Photoelectron Spectroscopy (XPS) for each lead coupon tested. A theoretical thermodynamic model was developed to predict lead. OP inhibitor addition was found to reduce lead release for the OP dosages evaluated and water blends evaluated compared to pH adjustment alone. Empirical models showed increased phosphorus and pH reduced lead release while increased alkalinity, chloride, and temperature contributed to lead release. Thermodynamic modeling suggested that hydroxypyromorphite is the controlling solid that forms on lead surfaces, regardless of blend, when OP inhibitor is added for corrosion control.

    Journal Title

    Desalination and Water Treatment

    Volume

    13

    Issue/Number

    1-3

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    348

    Last Page

    355

    WOS Identifier

    WOS:000275146100040

    ISSN

    1944-3994

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