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其它变色酸偶氮氯膦型显色剂(如pF-CP、pPr-CP、pI-CP、mE-CP等),张华山等亦指出它们发生α-反应的反应物浓度比较β-反应大3～4倍,这即反应物的低浓度比有利β-反应。 NP-mB与CP-Ⅲ或CP-mN不同,它与Y形成的β-型络合物吸光度随试剂用量增加而吸光度逐渐增大并达到一个恒定值渐趋平稳。这样就有可能增加试剂量,既能形成β-型络合物,又使其测量范围较宽,
Other discoloration acid chlorophosphonazo-type chromogenic agents (such as pF-CP, pPr-CP, pI-CP, mE-CP, etc.), Zhang Huashan et al also pointed out that they react α-reactant concentration of β- 3 to 4 times, which means that the low concentration of reactants favorable β-reaction. NP-mB is different from CP-Ⅲ or CP-mN in that the absorbance of β-type complex formed with Y increases gradually with the increase of reagent dosage and gradually reaches a steady value. This may increase the amount of reagents, both to form β-type complexes, but also to make it a wide range of measurements,