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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Castro, Jeyne Pricylla [1] ; Pereira-Filho, Edenir Rodrigues [1]
Total Authors: 2
Affiliation:
[1] Univ Fed Sao Carlos, Chem Dept, Grp Appl Instrumental Anal, POB 676, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Talanta; v. 189, p. 205-210, NOV 1 2018.
Web of Science Citations: 7
Abstract

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

FAPESP's process: 16/17221-8 - Composition evaluation of hard discs from electronic waste using spectroanalytical techniques: rare earth and noble metals determination
Grantee:Jeyne Pricylla de Castro
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 16/01513-0 - Laser-Induced Breakdown Spectroscopy (LIBS) application in the analyses of electronic waste (printed circuit boards and polymers), food and difficult preparation liquid samples
Grantee:Edenir Rodrigues Pereira Filho
Support type: Regular Research Grants
FAPESP's process: 14/22408-4 - Use of Laser-Induced Breakdown Spectroscopy (LIBS) for direct alloys analyses
Grantee:Jeyne Pricylla de Castro
Support type: Scholarships in Brazil - Master
FAPESP's process: 12/01769-3 - Development of spectroanalytical methods for direct analysis of waste electrical and electronic equipments and cosmetics
Grantee:Edenir Rodrigues Pereira Filho
Support type: Regular Research Grants