Table 3 LA-ICP-MS settings

Energy at the sample

(For 100 µm spot and 20 Hz)

3.2 mJ

Nebuliser gas

Ar, 0.7 L/min

Mode

Continuous pulse

Auxiliary gas

Ar, 1.2 L/min

Energy

80%

Plasma gas

Ar, 15 L/min

Repetition rate

20 Hz

RF power

1550 W

Spot size

80 µm

Acquisition mode

Peak hopping

Ablation time

60 s

Dwell time for the detector

20 ms (5 ms for ²³Na, ²⁷Al, ²⁸Si and ⁴⁴Ca)

Gas flow

He, 1L/min

Detector readings per acquisition

40