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| Titel |
Interference removals on Pd, Ru and Au with ICP-QQQ-MS in PGE RM |
| VerfasserIn |
Syed Nadeem Hussain Bokhari, Thomas Meisel, Christoph Walkner |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113275
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| Publikation (Nr.) |
 EGU/EGU2015-13473.pdf |
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| Zusammenfassung |
| Gold and platinum group elements (PGE) are essential industrial precious metals with high
world demand due to their unique properties. Struggle for natural exploration of PGE is on
great pace and recycling from industrial wastes, electronics and catalytic convertor is on the
rise for PGE supply chain. Along with these developments it is becoming more challenging
for analytical chemists to determine gold and PGE out of complex matrix which causes
severe interferences. The current state of art is online analysis coupled with chromatographic
separation of interferences.
The ICP-QQQ-MS Agilent 8800 has the capability of using multi tunes and
mass shifts. We aim to remove interferences on Pd+ (for direct and isotope dilution
analysis) Au+ and Ru+ in lieu of chemical separations. YO+, SrOH+, ZnAr+,
NiAr+, ZrO+, CuAr+, MoO+ , Ru+and Cd+ are expected interferences on Pd+
while Au+ is interfered by TaO+, HfOH+, GdAr+ and 102Ru+ ,104Ru+ by 102Pd+
,104Pd+ etc. Initial test were performed on pure solutions of 1mg/l (interfering
elements): 1 ng/l (Pd, Ru & Au) respectively. The outcomes of initial tests were applied
on PGE reference material (RM) WMG-1 and SARM-7 (digested with Na2O2
sintering).
The results obtained show that YO+, SrOH+ interfere (104Pd,105Pd), 104 Ru+ on (104Pd),
ZnAr+ has slight interference on (104Pd and106Pd), ZrO+, NiAr+, CuAr+ interferences are
negligible, MoO+ has severe interference on (108Pd, 110Pd) and that Cd+ has severe isobaric
interference on (106Pd,108Pd, 110Pd). These interference have been removed by
formation of Pd(NH3)3+complex. The TaO+, HfOH+ and GdAr+ interferences on
Au+ are best removed by formation of Au(NH3)+ and Au(NH3)2+ complexes.
102Pd+,104Pd+interference on 102Ru+ ,104Ru+ can be removed by formation of
Ru(NH3)4+ and RuO+ compounds. The results obtained comply with certified values of
RM. The developed method is being tested on low concentration PGE reference
materials.
References: Sugiyama, N. " Removal of complex spectral interferences on noble metal
isotopes." Agilent 8800 ICP-QQQ Application Handbook, 2014, 42-46. |
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