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N·N′-二(2-羟基-5-磺酸基苯)-C-氰(月朁)(简称DSPCF)已应用于铌、镓、锆、锗、钇、钪NO_2~-和NO_3~-和NO_3~-的测定,应用于铜的测定也有提及。本文研究了在pH3.0～5.0之间,铜与DSPCF形成蓝紫色络合物,其最大吸收波长为590nm,表观摩尔吸光系数为ε_(590)=2.8×10~4,络合物组成比Cu:DSPCF=1:2。试验部分一试剂与仪器铜标准溶液:1mg ml~(-1),称取0.1000g纯铜,溶于10ml混合酸(HNO_3+H_2SO_4=1+1)中,加热至冒烟。冷却,少量水稀释,用氢氧化钠溶液(5%)中和至近中性,移入100ml量瓶中,稀释至刻度。临用时稀释成10μg ml~(-1)。 DSPCF溶液:0.05%,称取0.25g DSPCF溶于
N · N’-bis (2-hydroxy-5-sulfobenzene) -C-Cyanate (abbreviated as DSPCF) has been applied to niobium, gallium, zirconium, germanium, yttrium and scandium NO_2 ~ - and NO_3 ~ - and NO_3 ~ - determination, the determination of the use of copper is also mentioned. In this paper, the formation of blue-purple complexes between copper and DSPCF at pH 3.0-5.0 showed that the maximum absorption wavelength was 590 nm and the apparent molar absorptivity was ε 590 590 2.8 × 10 -4. Than Cu: DSPCF = 1: 2. Test part of a reagent and instrument standard solution of copper: 1mg ml -1, weighed 0.1000g of copper, dissolved in 10ml of mixed acid (HNO_3 + H_2SO_4 = 1 +1), heated to smoke. Cool, dilute with a small amount of water, neutralize with sodium hydroxide solution (5%) to near neutral, transfer to 100ml volumetric flask and dilute to volume. Pro-diluted to 10μg ml ~ (-1). DSPCF solution: 0.05%, weighed 0.25g DSPCF dissolved