3.9. Real water analysis
The efficiency of the represented method was evaluated by
determining the concentration of CPs in well, tap and riverwater
samples. River water was collected from Jajrod River, and tap
and well water samples were collected from Tehran (Iran). The
samples were analyzed by GC-ECD after simultaneousDLLME
and derivatization procedures. The results showed that the analyzed
samples were free of CPs contamination. These samples
were spiked with the standards of CPs at different concentration
levels to assess matrix effects. Fig. 5 shows the obtained
chromatograms of river water and spiked river water at the concentration
level of 200gL−1 for MCPs, 100gL−1 for DCPs,
4.00gL−1 for TCPs and 2.00gL−1 for TeCPs and PCP. The
results of relative recovery of well, tap and river water samples
are shown in Table 3. Relative recoveries for all CPs in well,
tap and river water are between 91.6–104.7, 80.8–117.9 and
83.3–101.3%, respectively. These results demonstrate that the
matrices of the analyzed real water samples have little effect on
simultaneous DLLME and derivatization followed by GC-ECD
for determination of CPs.