DPD（N，N-二乙基对苯二胺）和安培滴定法测量游离有效氯（FAC）都会受到一氯胺和有机氯胺的干扰。在氯胺存在的情况下测得的FAC浓度通常显著大于真实的FAC残留量。快速滴定可减少DPD法中的干扰。通过在铂电极上保持200 mV的正电位，可以将安培滴定法中的干扰降至最低。包括70个参考文献、表格和图表。

Both the DPD (N,N-diethyl-p-phenylenediamine) and amperometric titration methods for measuring free available chlorine (FAC) are subject to interference from monochloramine and organic chloramines. The measured FAC concentration in the presence of chloramines is often significantly larger than the true FAC residual. Interference in the DPD method can be reduced by rapid titrations. Interference in the amperometric titration method can be minimized by maintaining a 200-mV positive potential on the platinum electrode. Includes 70 references, tables, figure.