基于亚硝酸根对溶解氧氧化溴连苯三酚红的催化作用，建立了双波长分光光度法动力学测定亚硝酸根的新方法。于３９２ｎｍ处测量体系吸光度Ａ＿１，４８４ｎｍ处测量体系吸光度Ａ＿２，以ΔＡ＝Ａ＿１－Ａ＿２进行亚硝酸根定量，所建立的方法对亚硝酸根的线性范围为０．００５～１．０μｇ／ｍＬ。该法简便、灵敏、选择性好、应用于蔬菜样品的测定，结果满意。 Based on the catalytic effect of nitrite on the oxidative oxidation of KBHP, a new method for the determination of nitrite by dual-wavelength spectrophotometry was established. The absorbance A 1 was measured at 392 nm, the absorbance A 2 was measured at 484 nm, and the nitrite was quantified by ΔA = A 1 -A 2. The linear range of the established method to nitrite was 0.005-1.0 μg / mL. The method is simple, sensitive and selective and is applied to the determination of vegetable samples with satisfactory results.