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本文提出在有机相中用5-Br-PADAP光度测定微量镍的新方法。从pП9.2～12.7、含有0.6～1.5克柠檬酸钠、5～25毫克丁二酮肟和微量镍的15～25毫升水溶液中,用氯仿(每次5毫升)萃取两次。萃液在氯仿-冰乙酸-乙醇介质中,用5-Br-PADAP显色,可定量测定微量镍。2～10毫升冰乙酸,0.75～3.0毫升0.354%5-Br-PADAP,0.5毫升乙酰丙酮对吸光度无影响。颜色至少稳定15小时。0～8.8微克镍/25毫升服从比尔定律,最大吸收为557毫微米,摩尔吸光系数为1.07×10~5。一定量的8种阴离子和26种阳离子在水相中对测定无影响。在测定的条件下,Ni(H):5-Br-PADAP为1:2。
This paper presents a new method for the photometric determination of trace nickel with 5-Br-PADAP in organic phase. From 15 to 25 ml of an aqueous solution containing pK9.2 to 12.7 containing 0.6 to 1.5 g of sodium citrate, 5 to 25 mg of dimethylglyoxime and trace amounts of nickel, the mixture was extracted twice with chloroform (5 ml each). Extracted in chloroform - glacial acetic acid - ethanol medium, with 5-Br-PADAP color, quantitative determination of trace nickel. 2 to 10 ml of glacial acetic acid, 0.75 to 3.0 ml of 0.354% 5-Br-PADAP, and 0.5 ml of acetylacetone have no effect on the absorbance. Color stable for at least 15 hours. Beer’s law is obeyed from 0 to 8.8 μg nickel / 25 ml. The maximum absorption is 557 nm and the molar extinction coefficient is 1.07 × 10 -5. A certain amount of 8 anions and 26 cations had no effect on the assay in the aqueous phase. The measured Ni (H): 5-Br-PADAP was 1: 2.