Research Article
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 8
Mutual interference and the influence of organic matter (5 mg L−1 K, Ca, Na, and Mg solution adjusted to pH = 1.0 with HNO3, discharge voltage: 650 V, flow rate: 3 mL min−1, interelectrode gap: 2 mm, and capillary diameter: 1 mm, added to 3% (volume ratio) methanol, ethanol, formic acid, and acetic acid and 50-fold K, Ca, Na, and Mg).