Pre-treatment method of detection of liquid sample with laser-induced breakdown spectroscopy

A laser-induced breakdown, liquid sample technology, applied in the preparation of test samples, etc., can solve the problems of loss of the element to be tested, uncontrollable distribution, increase of detection cost, etc., to reduce detection cost, shorten pretreatment time, simplify The effect of the preprocessing process

Active Publication Date: 2016-02-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods ensure the stability of the signal to a certain extent and improve the detection sensitivity, the sample pretreatment takes a long time, which not only increases the detection cost, but also easily causes the loss of analyte elements and uncontrollable distribution during the processing. or introduce interfering elements, etc.

Method used

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  • Pre-treatment method of detection of liquid sample with laser-induced breakdown spectroscopy
  • Pre-treatment method of detection of liquid sample with laser-induced breakdown spectroscopy
  • Pre-treatment method of detection of liquid sample with laser-induced breakdown spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 The pretreatment of liquid samples by superabsorbent resin

[0058] 1 Test part

[0059] Prepare the detection solution: use deionized water to prepare a Cr (chromium) element solution with a concentration of 100 μg / ml, and the anion in the solution is NO 3 - .

[0060] Take 0.3g of sodium polyacrylate superabsorbent resin powder, spread it in a flat-bottomed glass dish, add 3ml of the detection solution prepared above, shake it, and quickly form a gel to obtain the pretreated sample.

[0061] In order to illustrate the beneficial effects of the present invention, taking Example 1 as an example, using calcium oxide and frozen liquid samples as a control test, the details are as follows:

[0062] Calcium oxide treatment liquid sample: take 3ml of the detection solution prepared above, put it in a flat-bottomed glass dish, add 6g of calcium oxide powder, stir for 2 minutes, let it stand for 5 minutes, and wait for its complete reaction. Then, grind it with a...

Embodiment 2

[0088] Example 2 The mass volume ratio of the superabsorbent resin to the liquid sample in the method of the present invention is 1:7.5

[0089] Prepare the detection solution: use deionized water to prepare a Cr (chromium) element solution with a concentration of 100 μg / ml, and the anion in the solution is NO 3 - .

[0090] Take 0.4g of sodium polyacrylate superabsorbent resin powder, spread it flatly in a flat-bottomed glass dish, add 3ml of the detection solution prepared above, oscillate, and quickly form a gel to obtain the pretreated sample.

[0091] The test equipment, reagents and materials used are the same as in Example 1.

[0092] Then, carry out LIBS detection on the treated liquid sample, and the detection results are shown in Figure 6 .

[0093] Depend on Figure 6It can be seen that the method of the present invention detects the characteristic spectral lines of the element Cr (chromium) at 357.86nm, 359.34nm, 360.52nm and 425.42nm, 427.47nm, 428.96nm, and...

Embodiment 3

[0094] Example 3 The mass-to-volume ratio of the superabsorbent resin to the liquid sample in the method of the present invention is 1:12.5

[0095] Prepare the detection solution: use deionized water to prepare a Cr (chromium) element solution with a concentration of 100 μg / ml, and the anion in the solution is NO 3 - .

[0096] Take 0.24g of sodium polyacrylate superabsorbent resin powder, spread it in a flat-bottomed glass dish, add 3ml of the detection solution prepared above, oscillate, and quickly form a gel to obtain the pretreated sample.

[0097] The test equipment, reagents and materials used are the same as in Example 1.

[0098] Then, carry out LIBS detection on the treated liquid sample, and the detection results are shown in Figure 7 .

[0099] Depend on Figure 7 It can be seen that the method of the present invention detects the characteristic spectral lines of the element Cr (chromium) at 357.86nm, 359.34nm, 360.52nm and 425.42nm, 427.47nm, 428.96nm, and ...

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Abstract

The invention discloses a pre-treatment method of detection of a liquid sample with laser-induced breakdown spectroscopy. The pre-treatment method includes the steps of paving high-water-absorption resin in a container, adding the liquid sample into the container, and performing vibration to form gel. The invention also provides the detection method of the liquid sample with the laser-induced breakdown spectroscopy. The method greatly increases signal intensity of the liquid sample with laser-induced breakdown spectroscopy during detection, is low in intensities of a background signal and a noise signal, is high in signal-to-background ratio and signal-to-noise ratio, and greatly and effectively increases the sensitivity and accuracy of detection of the liquid sample.

Description

technical field [0001] The invention relates to a pretreatment method for detecting liquid samples by laser-induced breakdown spectroscopy. Background technique [0002] Laser Induced Breakdown Spectroscopy (LIBS for short) has the advantages of real-time, fast, in-situ, high sensitivity and wide detection range, and is widely used in metallurgical analysis, environmental monitoring, geological exploration, online monitoring, national defense and other fields. [0003] Qualitative and quantitative analysis of chemical elements in solid, liquid and gas samples can be performed by laser-induced breakdown spectroscopy. However, in the detection of liquid samples, when the pulsed laser is focused on the liquid sample, it often causes the liquid to sputter, and then adheres to the lens and detection window, which affects the accuracy of the test data; and the plasma formed by the liquid sample has a short life, The intensity of the generated spectral lines is also weak, and ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 段忆翔边访
Owner SICHUAN UNIV
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