High-Sensitivity Determination of K, Ca, Na, and Mg in Salt Mines Samples by Atomic Emission Spectrometry with a Miniaturized Liquid Cathode Glow Discharge

Figure 2

Typical LCGD-AES spectrum of the pH = 1.0 HNO₃ blank solution (a) and 50 mg L⁻¹ K, Ca, Na, and Mg mixture solution adjusted to pH = 1 with HNO₃ (b) (discharge voltage: 650 V, flow rate: 3 mL min⁻¹, interelectrode gap: 2 mm, and capillary diameter: 1 mm).

(a) Blank solution

(b) Mixed solution of K, Ca, Na, and Mg