3.2. TCLP and WET leaching results
Among all replicate samples, chromium TCLP extracts (0.062– 1.28 mg/L) were generally half the concentration of WET extracts (0.559–2.58 mg/L). Lead was below detection limits for 11 of the WET samples (16 total) and 6 TCLP samples (12 total). Table 1 includes the leaching results for the four e-cigarettes (A, B, C, and D) in triplicate (TCLP) and quadruplicate (WET), as well as the regulatory thresholds for constituents of concern and iron. The ‘‘W’’ or ‘‘T’’ preceding the sample ID indicates the test method (e.g. TA-1 represents TCLP of e-cigarette A, replicate 1).