In Chapter 28 we discuss inductively coupled plasma atomic emission spectrometry. In that method, the number of atoms excited to a particular energy level is a strong function of temperature. For an element of excitation energy E in joules (J), the measured ICP emission signal S can be written
S = k’e−E/kT
where k’ is a constant independent of temperature, T is the absolute temperature in kelvin (K), and k is Boltzmann’s constant (1.3807 × 10–23 J K–1). For an ICP of average temperature 6,500 K and for Cu with an excitation energy of 6.12 × 10–19 J, how precisely does the ICP temperature need to be controlled for the coefficient of variation in the emission signal to be 1% or less?
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