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以往磁钢中的含铜量(3～4%)都采用电解法测定,但需分离去干扰元素铁后才能进行电解。电解法测定虽然准确度高,但操作手续麻烦,而且需用贵重的铂金网。近年来有用络合滴定法测定磁钢中铜,但大量的镍和钴元素有严重干扰,影响终点观测。二环己酮草酰双腙(简称BCO)比色测定铜,国内已应用在钢铁中铜的测定。有关报导认为锡、铅、铝、锰等对铜的测定没有干扰,而镍、钴、铁有干扰。本方法采用加入柠檬酸铵掩蔽铁,加入过量的BCO
Magnet in the past, the copper content (3 ~ 4%) are determined by electrolysis, but need to be separated to interfere with the elemental iron before electrolysis. Electrolytic determination of the high accuracy, but the operating procedures cumbersome, but also need expensive platinum network. In recent years, complexometric titration of copper in the magnet is available, but a large number of nickel and cobalt elements have serious interference, affecting the end point of observation. Dicyclohexanone oxalyl bis-hydrazone (referred to as BCO) colorimetric determination of copper, the domestic has been used in the determination of copper in steel. Relevant reports that the tin, lead, aluminum, manganese and other copper did not interfere with the determination, and nickel, cobalt, iron interference. This method uses the addition of ammonium citrate masking iron, adding an excess of BCO