Spectroanalytical method for evaluating the technological elements composition of magnets from computer hard disks.

摘要: Abstract In this study, inductively coupled plasma optical emission spectrometry (ICP OES) was used for the development of an analytical procedure elemental analysis hard disks (HDs). More than 50 samples were acquired and separated according to manufacturers. Both magnets used, namely, actuator (a) spindle (s) motor. The heated remove magnetism, ground in a knife mill sieved. Different digestion procedures performed with block digester microwave, three acid concentrations employed. Due lack certified materials or references from HDs, tests standard addition recovery verify accuracy proposed method. Hyperspectral image principal component also assist data treatment related Ni layer. For both magnets, best 100 mg sample, 7 mol L−1 nitric block. elements observed highest Fe followed by Nd Pr. This simpler others prioritized principles green chemistry.