fig1

Figure 1. Trueness (%) of ∑SCCP, ∑MCCP, and ∑LCCP measurements of fortified blank extraction as quantified by pattern deconvolution or chlorine-content calibration. Low and high spike levels were 100 and 400 ng, respectively, of ∑SCCPs, ∑MCCPs, or ∑LCCPs prepared at total chlorination degrees denoted as A-I. Full fortification details are shown in Supplementary Table 3. Horizontal guidelines are included to highlight the target trueness value of 100% and the accuracy criteria range of 50%-150% as defined by the European Union Reference Laboratory (EURL)^[35].