Test category: In-situ analysis of Lead isotopic composition
Test target: pyrite, chalcopyrite, feldspar, galena, etc.
Test period: 20-30 work days
Requirements:
1, thin sections, thick sections, or polished sections, length ≤ 5 cm, width ≤ 3 cm, thickness ≤ 0.8 cm, analysis spot marked on the reflected light images.
2, measurements can be done either by customer or by our technician.
3, Feldspar Pb concent should be > 5 ppm, and sulfide Pb concent should be > 200 ppm.
4, Sample Hg/Pb should be < 0.2. Please inform us in advance if not.
Analytical methods:
1. In-situ Pb isotope analysis of sulfide by using LA-MC-ICP-MS
2. In situ Pb isotope analysis of feldspar by using LA-MC-ICP-MS
Data quality:
Precision (2SE) depends on sample Pb concent.
Feldspar (K-feldspar and alkali feldspar)
Pb content > 20 ppm:
²⁰⁸Pb/²⁰⁴Pb<0.05
²⁰⁷Pb/²⁰⁴Pb<0.02
²⁰⁶Pb/²⁰⁴Pb<0.02
Pb concent = 5-20 ppm
²⁰⁸Pb/²⁰⁴Pb: 0.05~0.2
²⁰⁷Pb/²⁰⁴Pb: 0.02~0.06
²⁰⁶Pb/²⁰⁴Pb: 0.02~0.06
Sulfide
sulfide Pb concent vary significantly. The following precision is only for sulfide with Pb = 500 ppm.
²⁰⁸Pb/²⁰⁴Pb&asymp;0.018
²⁰⁷Pb/²⁰⁴Pb&asymp;0.007
²⁰⁶Pb/²⁰⁴Pb&asymp;0.007
Galena
²⁰⁸Pb/²⁰⁴Pb<0.008
²⁰⁷Pb/²⁰⁴Pb<0.003
²⁰⁶Pb/²⁰⁴Pb<0.003
Accuracy depends on analytical methods.
²⁰⁸Pb/²⁰⁴Pb&asymp;0.017
²⁰⁷Pb/²⁰⁴Pb&asymp;0.006
²⁰⁶Pb/²⁰⁴Pb&asymp;0.006
Applied standards: