高合金钢中高镍的测定一般采用重量法,此法准确度高,但操作时间长。比色法速度快但准确度较差。因此以上两种方法都不能满足生产的要求。近年来络合滴定测定高合金钢和铁氧体中的镍已获得了一些应用。但由于钢铁试样比较复杂,一般需分离后再进行络合滴定。常用的方法有氨水分离法和丁二肟沉淀镍分离法。以上两种方法终点易于观察,准确度也比较高,但操作比较繁杂。也有不需分离的方法,速度较快,但要除铬仍比较麻顽,当 The determination of high-nickel high-nickel steel commonly used gravimetric method, this method is high accuracy, but the operating time is long. Colorimetry is fast but less accurate. Therefore, these two methods can not meet the production requirements. In recent years, complexometric titration of nickel in high alloy steel and ferrite has been used for some applications. However, due to the complexity of the steel sample, generally need to be separated before complex titration. Commonly used methods are ammonia separation method and butane dioxime precipitation nickel separation method. End point of the above two methods is easy to observe, the accuracy is relatively high, but the operation is more complicated. There are also methods that do not need to be separated, faster, but to be more stubborn chromium, when