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Pretreatment method for liquid sample in laser-induced breakdown spectrum detection technology

A laser-induced breakdown and liquid sample technology, applied in the preparation of test samples, material excitation analysis, etc., can solve the problems of low enrichment capacity of trace heavy metals, expensive filter membranes, and low practicability, and achieve good results. Application prospect, improved enrichment ability, high sensitivity and accuracy

Active Publication Date: 2015-03-11
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Among the methods disclosed in the prior art, the ability to enrich trace heavy metals in liquid samples is still not high, and most of them use increased sampling volume to improve detection sensitivity, and some pretreatment methods have expensive filter membranes and processing time fluctuations. Or complex steps and other issues, resulting in low practicability
At the same time, there is no report on the application of 2,4,6-trimercapto-1,3,5-triazine trisodium salt in the pretreatment method of liquid samples detected by laser-induced breakdown spectroscopy

Method used

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  • Pretreatment method for liquid sample in laser-induced breakdown spectrum detection technology
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  • Pretreatment method for liquid sample in laser-induced breakdown spectrum detection technology

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Embodiment 1

[0048] Embodiment 1 The inventive method detects the heavy metal concentration in the liquid sample

[0049] (1) Take 2-5ml of liquid sample, and use a disposable plastic syringe to pass the sample through a 0.4 micron pore syringe filter to remove insoluble impurities;

[0050] (2) Use a pipette gun to take 1.0ml of the above-mentioned liquid sample after removing insoluble impurities, put it in a 3ml plastic centrifuge tube, adjust the pH value with 0.5mol / L nitric acid or ammonia solution as needed, and adjust it to pH=6.0 ~7.0;

[0051] (3) Select trimercaptotriazine trisodium salt (TMT) as a metal precipitation agent, add 200 μl of 15% TMT solution to the sample treated in step (2), and mix by pipetting;

[0052] (4) Cut the 0.2 μm pore diameter polymer microporous filter membrane into small pieces with a diameter of about 5 mm, infiltrate it in ultrapure water, and load it on the filter membrane support device, and use a disposable plastic syringe to absorb the treated ...

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Abstract

The invention discloses a pretreatment method for a liquid sample in a laser-induced breakdown spectrum detection technology. The pretreatment method comprises the following steps: (1), fetching a liquid sample and removing insoluble impurities; (2), adding a precipitator and uniformly mixing; (3), filtering the liquid sample treated by the step (2) by a microfiltration membrane with an aperture not larger than 0.2 micrometer, and removing excessive liquid on the filtration membrane to obtain a filtration membrane. According to the invention, precipitation enrichment is carried out on heavy metal in the liquid sample by the precipitator, the enrichment capability of the heavy metal is greatly improved, the sampling quantity of the liquid sample is reduced, detection can be carried out by only 1ml of sampling quantity, the detection sensitivity and accuracy are high, the detection limit can reach 10-1 to 10 ppb, and various metal elements can be simultaneously detected. Meanwhile, the pretreatment method also has the advantages of short pretreatment time, simple step, low cost and the like and has an excellent application prospect.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63G01N1/28G01N1/38
Inventor 段忆翔王旭王杰林庆宇
Owner SICHUAN UNIV
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