Question: In the chapter opener, trace metals in teeth and bone provide information about Otzi the Icemans diet and environment as a child and adult. The

In the chapter opener, trace metals in teeth and bone provide information about Otzi the Iceman’s diet and environment as a child and adult. The inorganic mineral matrix of teeth and bone is hydroxyapatite, Ca10(PO4)6(OH)2. Ca₁₀(PO₄)₆(OH)₂. Matrix-matched materials are needed to calibrate the laser ablation measurements in the Otzi studies.

Graphite furnace atomic absorption and inductively coupled plasma-mass spectrometry were used to determine manganese content in standard reference bone.
a. Explain why Mg(NO3)2Mg(NO₃)₂ is added to bone samples to suppress matrix interference in MnMn analysis by graphite furnace atomic absorption.
b. Explain why La3+La³⁺ is added to bone samples in an alternative graphite furnace method for MnMn.
c. Explain why NH3NH₃ is added in the dynamic reaction cell to suppress interference in inductively coupled plasma-mass spectrometry.

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aMgNO32MgNO32 is added to bone samples to suppress matrix interference in MnMn analysis because it is a major value that is lower than the concentration of Mn in bone This makes it a better reference material than CaCO3 which has a high concentration of Ca which is similar to Mn in the sample matrix and would interfere with the analysis b ... View full answer

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