Evaluation of ABS Resin Disk Certified Reference Materials for Heavy Metal Analysis by X-ray Fluorescence Analysis

Effect of Long-time X-ray Irradiation on Cr and Hg in a Polypropylene Disk Certified Reference Material Observed during Measurements by X-ray Fluorescence Spectrometry

“…The chemical form of Hg contained in the PP disk was mercury sulfide (HgS). 8,9,11 The concentrations for both Cr and Hg in the PP disk were 890.6 and 952 mg kg -1 , respectively. 11 The ED-XRF and WD-XRF spectrometers used in the present study were Rayny EDX-720 (Shimadzu Co., Japan) and ZSX 100e (Rigaku Co., Japan), respectively.…”

“…8,9,11 The diameter and the thickness of these disks are 30 and 2 mm, respectively. The chemical forms of Cr contained in the PP disk were lead chromate (PbCrO4) and chromium acetylacetonate (Cr(C5H7O2)3) which can be expressed as Cr(acac)3, as inorganic and organometallic compounds, respectively.…”

“…Since plastic materials are well known to be widely used in electrical and electronic equipment regulated in the RoHS directive, standard analytical procedures and certified reference materials (CRMs) of hazardous substances in plastics are of great interests and are being demanded. X-ray fluorescence (XRF) spectrometry is applied for a direct and speedy analysis of hazardous substances in electrical and electronic equipment, [3][4][5][6][7][8][9] and is also described in the IEC 62321 as a screening method with respect to the RoHS directive. 10 On the other hand, the loss of element in plastics during XRF measurements was of concern and was reported concerning an organometallic compound of Hg in plastic CRM due to its volatility, 3 which might result in serious analytical errors in the determination of hazardous substances.…”

“…Since the chemical forms of Cr for both inorganic and organometallic compounds were mixed in the PP disk CRM, the organo one was of concern to be possibly lost during long-time XRF measurements. Though any Hg contained was considered to be stable due to its inorganic chemical form, 8,9 it was also measured and compared to that of Cr. The XRF intensities of Cr (Kα), Hg (Lα) and Pb (Lα) as well as the XRF intensity ratios, either Cr/Pb or Hg/Pb, were obtained by both an energy-dispersive (ED)-XRF spectrometer and a wavelengthdispersive (WD)-XRF spectrometer with many replicated measurements, which corresponded to long-time X-ray irradiation.…”

Effect of Long-time Heating for Polyvinyl Chloride and Polypropylene Resin Pellet Certified Reference Materials for Heavy Metal Analysis

“…[4][5][6][7][8][9][10][11][12][13] So far, acrylonitrile-butadiene-styrene (ABS), [4][5][6][7]9 polyvinyl chloride (PVC) 8 and polypropylene (PP) 8,[10][11][12][13] resin CRMs for the determination of Br, Cd, Cr, Hg and Pb have been developed. These plastic CRMs were pellet or disk forms and were developed for chemical analysis 4,8,[10][11][12] or X-ray fluorescence spectrometry, [5][6][7]9,13 respectively. A X-ray fluorescence (XRF) spectrometry is expected for direct and speedy analysis of the hazardous substances in electrical and electronic equipment [14][15][16][17] and also described in the IEC 62321 as a screening method with respect to RoHS directive.…”