Chromium was measured many times near or above 1 mg/L.
However, neither the TC limit nor the STLC for chromium
(5 mg/L) was exceeded by any sample. The observation of chromium
leaching in greater concentrations in WET relative to TCLP is
consistent with published literature (Kang et al., 2013; Lincoln
et al., 2007). Nickel and copper leached greater concentrations in
TCLP than WET despite the greater liquid-to-solid ratio. Copper
was found in many TCLP samples above 10 mg/L, but was not near
the STLC (25 mg/L). Chromium, iron, lead, and zinc leached more in
WET experiments. Among all four e-cigarette products, iron leached
nearly an order of magnitude greater from WET than by
TCLP. Vann et al. (2006a) found that the presence of zinc or iron
in leachate reduces lead solubility, however no discernable trend
was observed here.
Chromium was measured many times near or above 1 mg/L.However, neither the TC limit nor the STLC for chromium(5 mg/L) was exceeded by any sample. The observation of chromiumleaching in greater concentrations in WET relative to TCLP isconsistent with published literature (Kang et al., 2013; Lincolnet al., 2007). Nickel and copper leached greater concentrations inTCLP than WET despite the greater liquid-to-solid ratio. Copperwas found in many TCLP samples above 10 mg/L, but was not nearthe STLC (25 mg/L). Chromium, iron, lead, and zinc leached more inWET experiments. Among all four e-cigarette products, iron leachednearly an order of magnitude greater from WET than byTCLP. Vann et al. (2006a) found that the presence of zinc or ironin leachate reduces lead solubility, however no discernable trendwas observed here.
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