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    STP1421

    Runoff Rates of Zinc — A Four-Year Field and Laboratory Study

    Published: 01 January 2002


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    Abstract

    As part of a major European industrial collaboration project, zinc runoff rates from new and aged zinc panels have been investigated during exposure to natural rain (up to four years) in Stockholm, Sweden. The average runoff rate was 3.1 g/m2,y for new zinc and 3.2 g/m2,y for 40 year old zinc, respectively. New and old zinc panels were also exposed to artificial rain in which the previously established so-called first flush effect could be studied in more detail. The zinc concentration in the runoff was high during the initial first flush region (100–400 μM), and decreased to lower values during the subsequent steady-state region (50–150 μM). Measured zinc concentration in the runoff (both during first flush and steady-state) increased with rain acidity and with decreased rain intensity at a given rain volume. The zinc concentration (during first flush) was also observed to increase with length of the dry period preceding a rain event.

    Keywords:

    roofing material, zinc, atmospheric corrosion, runoff, first flush, pH, intensity


    Author Information:

    He, W
    PhD student, Assistant Professor and Professor, Royal Institute of Technology, Stockholm,

    Wallinder, IO
    PhD student, Assistant Professor and Professor, Royal Institute of Technology, Stockholm,

    Leygraf, C
    PhD student, Assistant Professor and Professor, Royal Institute of Technology, Stockholm,


    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP10895S