Over the past two decades, electrolyte cathode atmospheric glow discharge (ELCAD) has received a rapid development.
#Elcad florine emission portable#
Therefore, it is necessary to develop a simple, convenient, and portable analytical technique. These shortcomings limit their use only in laboratory and do not meet the requirements for the field deployment or real-time monitoring. In addition, it is difficult for ICP to introduce high-salinity solutions, because the salinity load may cause signal suppression, spectral interferences, plasma instability, and even nebulizers blocking. However, these tools are generally confined to the laboratory and required high temperatures, high vacuum, high power input, or even inert/special gases. Traditional analysis tools such as AAS, ICP-AES, and ICP-MS are widely used for the determination of metal contents in a variety of real samples. Only in this way will the salt mines enjoy more potential applications. However, before the mining and processing, we often need to determine the metal contents. Many salt mines are exploited for raw materials used in industry, agriculture, and medicine. Salt mines represent a natural mineral resource because they contain many useful components, such as K, Ca, Na, and Mg. All results suggested that the developed portable analytical instrument can be used for on-site and real-time monitoring of metal elements in field with further improvement. Measurement results of the LCGD-AES are in good agreement with the comparison value obtained by inductively coupled plasma (ICP) and ion chromatography (IC). The limits of detections (LODs) of K, Ca, Na, and Mg were 0.390, 0.054, 0.048, and 0.032 mg L −1, respectively. The optimized analytical conditions of LCGD-AES were pH = 1 with HNO 3 as electrolyte, 650 V discharge voltage, and 3 mL min −1 solution flow rate. The miniaturized LCGD seems particularly well suited to rapid and high-sensitivity determination of K, Ca, Na, and Mg in salt mines samples. Lower energy consumption (<50 W) and higher excitation efficiency can be realized by point discharge of the needle-like Pt. An atomic emission spectrometer (AES) based on a novel atmospheric pressure liquid cathode glow discharge (LCGD) as one of the most promising miniaturized excitation sources has been developed, in which the glow discharge is produced between a needle-like Pt anode and the electrolyte (as cathode) overflowing from a quartz capillary.
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