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

Table 1

Analytical performance of LCGD-AES for K, Ca, Na, and Mg solution.

Analyte	Analytical line (nm)	Power (W)	Calibration equation		Sensitivity	LOD (mg L^−1)	(%)
K	766.5	40.3–46.8	= 21821 + 233931	0.9981	233931	0.390	0.26
Ca	422.7	41.6–46.2	= 4236 + 81256	0.9973	81256	0.054	6.83
Na	589.0	39.3–44.2	= 3182790 + 1473620	0.9822	1473620	0.048	0.28
Mg	285.2	40.3–46.8	= 589022 + 1846380	0.9918	1846380	0.032	2.83

Standard concentration: 5 mg L⁻¹, n = 10.