Pretreatment method of liquid samples in laser-induced breakdown spectroscopy detection technology

A laser-induced breakdown, liquid sample technology, applied in the preparation of test samples, material excitation analysis, etc., can solve the problems of low trace heavy metal enrichment ability, expensive filter membrane, low practicability, etc., and achieves good results. Prospect of application, improved enrichment ability, high sensitivity and high accuracy effect
CN104406943BActive Publication Date: 2017-02-22SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2017-02-22

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Abstract

The invention discloses a liquid sample pretreatment method in laser-induced breakdown spectroscopy detection technology, which comprises the following steps: (1) taking a liquid sample and removing insoluble impurities; (2) adding a precipitating agent , and mix uniformly; (3) filter the liquid sample treated in step (2) through a microporous filter membrane with a pore size ≤ 0.2 μm, and remove excess liquid on the filter membrane to obtain a filter membrane. The present invention uses a precipitant to precipitate and enrich heavy metals in liquid samples, which greatly improves the ability to enrich heavy metals and reduces the sampling volume of liquid samples. The sampling volume can be detected by only 1ml, and the detection sensitivity and accuracy High, its detection limit can reach 10‑1~10ppb, and it can detect multiple metal elements at the same time; it also has the advantages of short pretreatment time, simple steps, low cost, etc., and has a good application prospect.
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Description

technical field

[0001] The invention relates to a pretreatment method for liquid samples in laser-induced breakdown spectroscopy detection technology. Background technique

[0002] The detection of heavy metal ions in water samples is an important item in water quality monitoring. Traditional metal detection methods in water samples include spectrophotometry, flame atomic absorption spectrophotometry, graphite furnace atomic absorption spectrophotometry, inductively coupled plasma atomic emission spectrometry, and inductively coupled plasma mass spectrometry. Among them, spectrophotometry requires the use of color reagents to react with metal ions, which has the disadvantages of large interference and the inability to measure multiple elements at the same time. Other instrument analysis methods have the disadvantages of large equipment volume and weight, and need to burn or protect gas sources. Suitable for laboratory analysis. Some of these methods cannot be well applied ...

Claims

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