Chemical Stability and Compatibility - Antimony count unstable in ICP-OES

Instrument: ICP-OES Wavelength: Sb206.834 and Sb217.582 Product: CGSB1-125ml LOT# N2-SB665459 and P2-SB676727 the intensity of 1 and 10ppm Antimony solution from IV increased gradually when repeat injection from same solution. others element are fine. Inorganic Ventures 10ppm in Matrix is 0.07N + 0.8%HNO3 Inorganic Ventures 1ppm in Matrix is 0.07N + 0.08%HNO3 LOT# N2-SB665459 Trial 1: 2256 Trial 2: 2415 Trial 3: 2633 Trial 4: 2858 Trial 5: 3070 Trial 6: 3260 Trial 7: 3376 Trial 8: 3520 LOT# P2-SB676727 Trial 1: 2525 Trial 2: 2826 Trial 3: 3035 Trial 4: 3262 Trial 5: 3394 Trial 6: 3496 Trial 7: 3564 Trial 8: 3605
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Brian Alexander, PhD Total posts: 16

Thank you for the detailed information. Since the amount of Sb in the solution is not increasing you are probably observing memory effects, which we have observed as well for Sb during ICP analyses. Our experience has been that Sb frequently 'sticks' to the peristaltic pump tubing, so one option is to change that and see if it helps. Alternatively, trace amounts of HF (~0.2% v/v) added to the rinse solution are effective at reducing memory effects for Sb, and HF concentrations at that level are generally not damaging to glass ICP sample introduction systems (though we would recommend additional rinses without HF and close observation of Si background levels).

Posted: 02/25/20 08:42:15

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