分散灰 N(简称灰 N)主要是由分散蓝2BLN,分散红3B,分散黄 RGFL(分别简称为分蓝,分红,分黄)三种染料组成的。本文采用紫外-可见光谱系数倍率法直接测定灰 N 中的三个组分的百分含量。1.确定测定波长和 K 值:称取分蓝0.0124g,分红0.0135g,分黄0.0200g,用 N,N-二甲基甲酰胺(DMF):水=1:1为溶剂,分别配制浓度在2.4～24mg/L;2.7～27mg/L,4～40mg/L 范围内的分蓝、分红、分黄一系列标准液,取三种溶液中一种溶液,用 UV-250分光光度计测定三者在700～300nm 处的 UV- Disperse gray N (referred to as gray N) is mainly composed of three kinds of dyes: Disperse Blue 2BLN, Disperse Red 3B, Disperse Yellow RGFL (abbreviated as sub-blue, dividend, sub-yellow) In this paper, UV spectrophotometric ratio method for the direct determination of gray N content of the three components. 1. To determine the determination of wavelength and K value: Weigh sub-blue 0.0124g, dividend 0.0135g, yellowing 0.0200g, with N, N- dimethylformamide (DMF): water = 1: 1 as solvent, respectively, the concentration In a series of standard solutions of 2.4 ~ 24mg / L, 2.7 ~ 27mg / L and 4 ~ 40mg / L, a solution of three solutions was prepared and measured by UV-250 spectrophotometer The three at 700 ~ 300nm UV-