Alternative gas switching method for ion mobility spectrometry in standby and analysis modes

The invention discloses a fast detection method for primary aromatic amines in finger paint. The method comprises sample treatment and sample analysis, wherein an in-situ spraying ionization device is adopted to detect. The method specifically comprises the steps: (1) sample treatment, namely dipping a finger paint sample with a metal micro-electrode, inserting the metal micro-electrode into a borosilicate glass capillary tube filled with a pre-mixed solution to form the in-situ spraying ionization device; and (2) sample analysis, namely putting the in-situ spraying ionization device at the front end of a sample inlet of an ionic migration spectrometer, setting the parameters of the ionic migration spectrometer, applying a spraying voltage, ionizing the sample, and feeding the sample into a transfer tube to be separated, and detecting the sample by means of a Faraday cup detector. The method disclosed by the invention is low in cost and simple to operate, and can accurately and quickly detect primary aromatic amines in finger paint.

Fast detection method for primary aromatic amines in finger paint

The utility model discloses an automatic gas flow rate control device for an ion mobility spectrometer, which is arranged in a gas path of the ion mobility spectrometer. The automatic gas flow rate control device comprises a gas flow rate sensor used for measuring a gas flow rate and converting and outputting corresponding electrical signals of the gas flow rate, a data collecting and processing device responsible for collecting the converted electrical signals of the gas flow rate, processing the electrical signals and then outputting control signals, and a gas flow rate control device controlling the gas flow rate through the control signals, wherein the gas flow rate sensor is connected with an input end of the data collecting and processing device; and an output end of the data collecting and processing device is connected with the gas flow rate control device. According to the automatic gas flow rate control device, the gas flow rate is firstly measured through the gas flow rate sensor, corresponding electrical signals of the gas flow rate are converted and output, then AD (analog-to-digital) conversion is conducted, corresponding control values are calculated and corresponding control signals are output after lowpass filtration is conducted, and the gas flow rate control device is controlled at corresponding opening degrees by the gas flow rate sensor through the control signals, so that the gas flow rate in the gas path can be accurately controlled.

Automatic gas flow rate control device for ion mobility spectrometer

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Automatic gas flow rate control device for ion mobility spectrometer