LIQUID CATHODE GLOW DISCHARGE PLASMA-ATOMIC EMISSION SPECTRUM APPARATUS AND METHOD CAPABLE OF PERFORMING DIRECT GAS SAMPLING AND USED FOR DETECTING HEAVY METAL ELEMENT

摘要

A liquid cathode glow discharge plasma-atomic emission spectrum apparatus and method capable of performing direct gas sampling and used for detecting a heavy metal element. The liquid cathode glow discharge plasma-atomic emission spectrum apparatus comprises a high-voltage power source, a snubber resistor (22), a hollow metal anode (10) and a liquid cathode. The hollow metal anode (10) is connected to a positive electrode of the high-voltage power source by means of the snubber resistor (22), and the liquid cathode is connected to a negative electrode of the high-voltage power source by means of a graphite electrode (9). The plasma apparatus is further formed into the following structure: a discharge region (11) is formed between the hollow metal anode (10) and the liquid cathode, and the hollow metal anode (10) further serves as a sampling pipeline, so that gas to be detected enters the discharge region (11) and is excited. The apparatus is simple, has a small volume, is convenient to install, is low in running power consumption, is operated at atmospheric pressure, requires no atomizer, requires no vacuum system, easily achieves miniaturization, performs sampling in the form of gas, does not affect plasma stability thereof, has high sensitivity in metal element analysis, and is applicable to the analysis of a metal element in gas.