Sample Preparation - Matrix modifiers for GFAA (graphite furnace atomic absorption)

 
Currently, we are using 0.3% Palladium and 0.2 % Magnesium modifier for Chromium analysis. Previously, the staff were using magnesium nitrate modifier for chromium analysis. Could you please explain what the 5 buffers are used for listed on your web page? 0.5% Palladium Modifer (MM-PD-5) 1% Palladium modifier (MM-PD-10) 1% Lanthanium releasing agent (LACB1) 1% Magnesium nitrate modifier (MM-MG-10) 4% Phosphate modifier (MM-P-40)
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For each of the products you list, they are primarily designed for measuring the following metals during graphite furnace AA (GFAA) methods:

  1. 0.5% and 1% Palladium Modifier – For Ag, As, Au, Bi, Ge, Hg, In, Sb, Se, Sn, Te, and Tl in conjuction with Mg(NO3)2, and for P in conjunction with Ca(NO3)2. Pd is considered somewhat of a universal modifier for many elements.
  2. 1% Lanthanum releasing agent – For Ca, and P in steel samples.
  3. 1% Magnesium nitrate modifier – For all of the metals listed in #1 above when used with Pd, and for Al, Be, and for first row transition metals such as Co, Cr, Fe, Mn, V, and Zn.
  4. 4% Phosphate modifier – For Cd and Pb.

The above information is general, and a good reference is “Modifiers in Graphite Furnace Atomic Absorption Spectrometry—Mechanisms and Applications” published as part of the Encyclopedia of Analytical Chemistry. The manufacturer of your instrument should also be able to provide detailed information.

Posted: 09/06/18 04:13:23

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