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利 用主次双波长光度 法，通过 Ｆｅ（Ⅱ）ｐｈｅｎ 显色体 系，依据显 色体系吸 光度 Ａ 与照射波 长 λ及 物质浓度 ｘ 间关系，提出了测定铁的主次波长新光度法，精密度提高，检出限降低。
According to the relationship between the absorbency A of the color system and the irradiation wavelength λ and the substance concentration x, the new photometric method for the determination of iron primary and secondary wavelengths was proposed by using primary and secondary double-wavelength photometry and Fe (Ⅱ) phen colorimetric system. The precision Improve, reduce the detection limit.