Method for fast forming plasma in liquid cathode glow discharge atomizer

Abstract

The invention discloses a method for fast forming a plasma in a liquid cathode glow discharge atomizer. The method comprises the steps of: controlling the initial flow velocity of a peristaltic pump at 1.5-3.5mL.min<1>, and the interval between a metal anode and a glass capillary tube to be 3mm; when the voltage applied between the metal anode and the glass capillary tube is direct-current high voltage of 950-1050V, regulating the flow velocity of a peristaltic pump at 4.2-8.5mL.min<1>, or increasing the flow velocity to be 4.2-8.5mL.min<1> through a fast pump button in the peristaltic pump; after the current is stable, restoring the flow velocity of a peristaltic pump to be the initial flow velocity. The method for fast forming plasma in the liquid cathode glow discharge atomizer has the advantages of being safe, fast, simple and convenient to operate, and the like, can be widely popularized and applied, and is applicable to plasma in a liquid cathode glow discharge emission spectrometer or similar devices.

Description

technical field [0001] The invention relates to a method for quickly forming plasma in a liquid cathode glow discharge atomizer, belonging to the technical field of atomic spectrum analysis. Background technique [0002] In the current research, the main structure of the single liquid electrode discharge system is basically the same, including four parts: light source generation (ie atomizer), spectroscopic system, detection device and data processing system. The atomizer includes a metal anode, a liquid pool, a sampling tube (including a glass capillary) and a drain tube. The liquid sample is introduced into the glass capillary by the peristaltic pump through the sampling tube to overflow, and the overflow part is used as the liquid cathode and the metal anode to generate plasma under the condition of applying high voltage. During the discharge process, the solution in the liquid electrode is continuously vaporized, so that the metal ions dissolved in the solution enter th...

AI Technical Summary

Problems solved by technology

[0003] The existing liquid sample is used as a cathode and a metal anode to generate plasma under high voltage conditions. The metal anode is in contact with the sample solution overflowing from the glass capillary. However, when this method is used to generate plasma in experiments, ignition often occurs. difficulty

[0004] Since the liquid cathode and the metal anode generate plasma under the condition of applying high voltage, the following situations are prone to occur: 1. The metal electrode is broken due to excessive contact with the glass capillary; 2. The metal anode is easily deviated by contacting the metal anode close to the glass capillary. Difficulty focusing the optical path due to the original position

In this method, the contact distance between the metal electrode and the glass capillary is difficult to grasp, and the experimenter needs to be careful.