Effect of a dual‐head short‐stroke pump on post‐column peroxyoxalate chemiluminescence detection

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Abstract
A dual‐head short‐stroke pump has two advantages in the post‐column peroxyoxalate chemiluminescence (PO‐CL) detection system. The first is to increase the mixing efficiency of solutions. The second is to increase the stability of the PO‐CL reaction by keeping the aryl oxalate and hydrogen peroxide solutions separate. The detection sensitivities for six polycyclic aromatic hydrocarbons (PAHs) increased in the present system by using bis(2,4‐dinitrophenyl) oxalate (DNPO) or bis (2,3,4,5,6‐pentafluorophenyl) oxalate (PFPO) instead of such popular aryl oxalates as bis(2,4,6‐trichlorophenyl) oxalate (TCPO) and bis[2‐(3,6,9‐trioxadecyloxycarbonyl)‐4‐nitrophenyl] oxalate (TDPO). Both DNPO and PFPO increased the sensitivities by factors of 4.1–10.2 and 3.5–8.1, respectively. In addition, DNPO was more stable than PFPO in acetonitrile. These results suggest that DNPO is the most useful aryl oxalate for the sensitive PO‐CL detection of PAHs.

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