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Questions around matrix and elemental compatibility are encountered by all of us on a regular basis. This section addresses this question. Only the most popular matrices will be presented here. Consult our Interactive Periodic Table for other matrices and more information on compatibilities. Technique and calculations will be discussed in part 3 of this guide. Nitric Acid MatricesMost analysts prefer nitric acid (HNO3) matrices due to the solubility of the nitrates as well as its oxidizing ability and the relative freedom from chemical and spectral interferences as compared to acids containing Cl, S, F, or P. In addition, HNO3 is very popular in acid digestion sample preparations. The elements that are stable/soluble and commonly diluted in aqueous/HNO3 are shaded in red below: ![]()
F denotes that the element can be diluted in HNO3 if complexed with F-. Cl denotes that the element can be diluted in HNO3 if complexed with Cl-. HF denotes that the element should have excess HF present when diluted with HNO3. T denotes that the tartaric acid complex can be diluted in HNO3. |
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