论文部分内容阅读
在pH5.8—6.0的氯化铵-六次甲基四胺缓冲溶液中镍与丁二肟形成络合物在示波极谱仪上产生催化波(E_p约等于-0.90伏),波形良好,波高恒定,干扰离子甚少。试验了20多种共存离子,仅发现钴量高达50微克时镍波高严重偏低;铁在镍波前起波,可用酒石酸钾钠掩蔽;钴在紧接镍波后起波,可用钴试剂络合除去;锌在镍波后有一波峰(E_p为-1.05伏),但不干扰测定。50毫升溶液中含镍不超过30微克时浓度与峰电流呈线性关系,可用于一般矿物岩石和单矿物中0.000x—0.5%镍的测定。
The formation of a complex of nickel with butadiene dioxime in a ammonium chloride-hexamethylenetetramine buffer solution at pH 5.8-6.0 produces a catalytic wave (E_p approximately equal to -0.90 volts) on an oscilloscope polarograph with a good waveform , Constant wave height, little interference ions. More than 20 kinds of coexisting ions were tested, and it was found that when the cobalt content was as high as 50 micrograms, the nickel wave height was extremely low; iron waved in the nickel wave front and could be masked by potassium sodium tartrate; cobalt waved immediately after the nickel wave, Together; zinc has a peak after nickel wave (E_p is -1.05 volts), but does not interfere with the determination. The concentration and peak current in a 50 ml solution containing no more than 30 micrograms of nickel is linear and can be used for the determination of 0.000x to 0.5% nickel in general mineral rocks and single minerals.