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测定镍所用的2(5-溴-2吡啶偶氮)-5二乙氨基酚(简称5-Br-PADAP)是目前灵敏度最高的试剂之一,它的灵敏度要比常用的丁二铜肟约高7—8倍。但由于有 Fe~(3+)、Cu~(2+)、Co~(2+)严重干扰,需用离子交换或萃取方法进行分离,操作繁琐。本文利用镍在氢氧化铵溶液中生成镍氨络离子的特性,使黄铁矿中的大量铁与镍分离。用硫代乙醇酸掩蔽干扰元素,Triton x-100作增溶剂,使5-Br-PADAP 与镍生成有色的络合物,从而进行镍的测定。这样简化了分析手续,提高了方法的选择性。实验表明,0—6微克镍/25毫升服从比尔定律。
Determination of nickel used in 2 (5-bromo-2-pyridylazo) -5 diethylamino phenol (referred to as 5-Br-PADAP) is currently one of the most sensitive reagents, its sensitivity than the conventional dibutyl copper oxime about High 7-8 times. However, due to the serious interference of Fe ~ (3 +), Cu ~ (2 +) and Co ~ (2+), ion exchange or extraction methods are required to be separated and the operation is cumbersome. In this paper, nickel hydroxide in ammonia solution generated by the characteristics of nickel ammonia ions, a large number of iron in pyrite and nickel separation. Nickel was determined by masking interfering elements with thioglycolic acid, Triton X-100 as a solubilizer, and a colored complex of 5-Br-PADAP with nickel. This simplifies the analysis procedures and enhances the selectivity of the method. Experiments show that 0-6 micrograms of nickel / 25 ml obey Bill’s law.