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Method for measuring trace total sulfur by using pulse ultraviolet fluorescence method

A fluorescence method and ultraviolet light technology, which is applied in the field of sulfur content determination by ultraviolet fluorescence method to achieve the effect of improving the detection sensitivity and reducing the baseline noise of the instrument

Inactive Publication Date: 2009-09-16
朱明俊
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Problems solved by technology

[0003] The technical problem mainly solved by the present invention is to overcome the deficiencies of the existing ultraviolet fluorescence method for measuring sulfur, and provide a method for measuring trace total sulfur by pulsed ultraviolet fluorescence method that can improve detection sensitivity and accuracy

Method used

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Embodiment Construction

[0007] The present invention is further illustrated below by way of examples.

[0008] (1) Send the sample into the high-temperature combustion tube. In the oxygen-rich condition, sulfur is oxidized to sulfur dioxide (SO 2 ), the gas produced by the combustion of the sample is to be tested after removing moisture;

[0009] (2) Set a light-shielding plate with a light-transmitting hole between the ultraviolet light source with a wavelength of 210nm and the gas to be measured, and set a light-shielding blade driven by a motor between the ultraviolet light source and the light-shielding plate, and the blade periodically blocks the above-mentioned light-transmitting hole , in each cycle, the blocking time is 5 milliseconds, and the non-blocking time is 1 second, thus forming a pulsed ultraviolet light source;

[0010] (3) The pulsed ultraviolet light emitted by the pulsed ultraviolet light source irradiates the gas to be measured, sulfur dioxide (SO 2 ) absorbs the energy of ult...

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Abstract

The invention discloses a method for measuring trace total sulfur by using a pulse ultraviolet fluorescence method. The method comprises the following steps of: adopting a pulse ultraviolet light source to irradiate sulfur dioxide generated by burning a sample periodically in an intermittent way; measuring fluorescence emitted by exciting sulfur dioxide by a detector and further calculating content of sulfur; the wavelength of ultraviolet emitted from the pulse ultraviolet light source is 190 to 230nm; in every period of irradiating sulfur dioxide in an interval way, the irradiating time is 0.8 to 1.2 seconds and the interval time is 4 to 6 milliseconds; and a light screen which moves with constant speed or periodicity is used for screening or permeating ultraviolet light in an alternating way. The method is used for measuring low sulfur in various solid, liquid and gas samples; due to being irradiated by pulse ultraviolet light, the sulfur dioxide generates stable energy source when returning base state from excited state, thus reducing baseline noise of instrument caused by change of energy, and effectively improving sensitivity and accuracy of detection; and the lower limit of detection of sulfur measurement is 10PPb.

Description

technical field [0001] The invention relates to a method for measuring sulfur content by an ultraviolet fluorescence method, in particular to a method for measuring trace total sulfur by a pulsed ultraviolet fluorescence method. Background technique [0002] In the fields of petrochemical production and environmental protection, accurate determination of sulfur content in samples is very important. At present, the ultraviolet light method is generally used to measure sulfur, and the sample is sent to the high-temperature combustion tube. Under the condition of rich oxygen, the contained sulfur is oxidized into sulfur dioxide (SO 2 ), and then irradiated with ultraviolet light, sulfur dioxide absorbs the energy of ultraviolet light and transforms into excited state sulfur dioxide (SO 2 * ), the excited state sulfur dioxide molecule is unstable, returns to the ground state instantly, emits fluorescence, and then detected by the photomultiplier tube, and then calculates the s...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 朱明俊潘巧英薛元祥陈官容
Owner 朱明俊
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