Problem

In Chapter 28 we discuss inductively coupled plasma atomic emission spectrometry. In that...

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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