Closed type fluorescence analyzer
A fluorescence analyzer, a closed technology, applied in the field of analytical chemistry, can solve the problems of reducing the fluorescence signal intensity of the detector, affecting the fluorescence signal intensity, and low fiber coupling efficiency, so as to improve the fluorescence signal intensity, increase the sensitivity, and improve the monochromatic sexual effect
Active Publication Date: 2015-03-11
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology
However, according to the mechanism of fluorescence, the fluorescence intensity is proportional to the incident light intensity under certain conditions, and the existing optical fiber coupling efficiency is low (5%-10%), which reduces the signal intensity detected by the detector by 10-10%. 20 times
Therefore, the use of optical fiber to transmit the incident light signal and the fluorescence signal reduces the intensity of the incident light, which affects the intensity of the fluorescence signal generated by the sample, and at the same time reduces the intensity of the fluorescence signal captured by the detector, thereby affecting the sensitivity of the instrument
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Embodiment 1
[0037] The closed-type fluorescence analyzer provided by the invention is used to measure thorium solutions with different concentrations, and the relationship between sample concentration and fluorescence intensity is investigated. Six different concentrations of thorium solutions were measured. The linear regression equation of the working curve is y = 87.533x + 67.869, r > 0.999. The lower limit of detection is 0.1 ng / ml, and the linear range of the working curve is (0.1-100) ng / ml. According to literature, the linear range of ordinary fluorescence analyzer is (1-10) ng / ml, and the detection limit is 1 ng / ml.
[0038] Table 1 Relationship between thorium concentration and fluorescence intensity
[0039] Thorium concentrationng / ml Fluorescence intensity F 0.1 120 0.5 320 1 153 5 480 10 750 50 4480 100 8823 linear regression equation y = 87.533x + 67.869
[0040] The results show that: the closed fluorescence analyz...
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Abstract
The invention belongs to the technical field of analytical chemistry, and particularly relates to a closed type fluorescence analyzer consists of a sample chamber system, a light source control system and a spectrograph, and is characterized is that the sample chamber system comprises a sample chamber, a light source, a light filter and a focusing lens, wherein the light source, the light filter and the focusing lens are fixed on a sample cell bracket in the sample chamber; the sample chamber is arranged in a glove box; the light source control system, the spectrograph and a computer are arranged outside the glove box; and the spectrograph is connected with the sample chamber by an optical fiber. The closed type fluorescence analyzer has the characteristics of being convenient in protection, easy to maintain, high in sensitivity and suitable for analyzing the measured aftertreatment sample.
Description
technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a closed fluorescence analyzer. Background technique [0002] Fluorescence analyzers can be used for the analysis of various trace elements. Due to the characteristics of strong radioactivity, strong acidity, toxicity, complex components, and trace amounts of the feed liquid after nuclear fuel reprocessing, the analysis is difficult and the analysis equipment is easily damaged. Therefore, the equipment used in post-processing analysis must be suitable for the special environment of post-processing in order to ensure the accuracy of the analysis results, which puts forward requirements for post-processing equipment: sample analysis must be operated in a sealed system with protective facilities , easy to protect; easy to replace vulnerable parts, easy to maintain; the sensitivity of the analytical instrument should be high. [0003] The traditional fluore...
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IPC IPC(8): G01N21/64
Inventor 钱红娟刘焕良张丽华范德军王玲
Owner CHINA INSTITUTE OF ATOMIC ENERGY