The operating conditions were: radiofrequency applied power of 1.3 kW, nebulizer gas flow-rate of 0.87 L min1, plasma gas flowrate of 13 L min1, auxiliary gas flow-rate of 0.70 L min1, CCT mode
gas flow-rate, 6.5 L min1; dwell time 10 ms, sweeps 100, and three replicate readings.