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 3

Measurement results of K, Ca, Na, and Mg in real salt mines by LCGD-AES, ICP, and IC.

Sample	Element	This work (mg g^−1)	ICP (mg g^−1)	IC (mg g^−1)	(%)
A	K	599.08 ± 16.55	—	479.20 ± 8.23	107.86
	Ca	0.28 ± 0.04	0.23 ± 0.05	0.31 ± 0.01	84.05
	Na	5.34 ± 1.04	—	3.25 ± 0.03	90.63
	Mg	2.34 ± 0.30	2.66 ± 0.03	2.13 ± 0.05	106.92
B	K	577.93 ± 10.56	—	466.08 ± 5.14	115.94
	Ca	0.33 ± 0.03	0.84 ± 0.05	0.37 ± 0.01	87.16
	Na	4.55 ± 1.10	—	3.60 ± 0.05	98.76
	Mg	2.97 ± 0.13	3.14 ± 0.05	2.84 ± 0.03	103.04
C	K	641.35 ± 21.78	—	488.18 ± 8.56	112.69
	Ca	0.32 ± 0.01	0.31 ± 0.01	0.37 ± 0.01	88.37
	Na	5.06 ± 1.12	—	4.79 ± 0.05	91.83
	Mg	2.71 ± 0.20	3.62 ± 0.07	3.53 ± 0.05	104.02
D	K	641.52 ± 10.42	—	485.82 ± 6.42	109.19
	Ca	0.25 ± 0.04	0.30 ± 0.03	0.28 ± 0.01	94.03
	Na	5.22 ± 1.13	—	4.24 ± 0.05	94.63
	Mg	3.33 ± 0.28	4.50 ± 0.05	4.03 ± 0.03	106.32

standard concentration: 5 mg L⁻¹, = 10.