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Fast multi-mode element speciation analysis preprocessing system

An element form and multi-mode technology, applied in the field of instrument analysis, can solve problems such as time-consuming, damaged pipe joints, and low efficiency, and achieve the effects of strong versatility, easy structure, and simple structure and operation

Active Publication Date: 2016-09-07
TIANJIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the low hydride generation efficiency of high-valent elements, such as arsenate, selenate, antimonate, etc., in order to improve the analytical sensitivity, a pre-reduction operation is required
[0003] The above pretreatment process involves oxidizing agent, pre-reducing agent, KBH 4 The introduction of reducing agent, HCl carrying current, etc., so the connection of the pipeline of the speciation analysis pretreatment system is complicated. When analyzing the speciation of different elements, it is necessary to reinstall the chromatographic column and readjust or switch the pipeline. This process involves related professional knowledge and consume a lot of time, and frequent pipeline adjustments will cause damage to pipeline joints, etc.

Method used

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  • Fast multi-mode element speciation analysis preprocessing system
  • Fast multi-mode element speciation analysis preprocessing system
  • Fast multi-mode element speciation analysis preprocessing system

Examples

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Embodiment 1

[0031] A fast multi-mode elemental speciation analysis pretreatment system, comprising sequentially connected chromatographic column selection module 1, digestion selection module 2, pre-reduction selection module 3 and hydride generation module 4, the chromatographic column selection module consists of a six-way valve 8. The anion-exchange chromatography column 6 and the reverse chromatography column 7 are composed, the ports a and b of the six-way valve 8 are respectively connected to the two ends of the anion-exchange chromatography column, and the ports e and d of the six-way valve 8 are respectively connected to the ports of the reverse chromatography column At both ends, the f port of the six-way valve 8 is connected to the inlet 5 of the sample to be analyzed, and the c port of the six-way valve 8 is connected to the digestion selection module. The digestion selection module includes a six-way valve 17, a digestion extension coil 16 and an oxidant storage tank 9. Ports a...

Embodiment 2

[0050] The difference with embodiment 1 is: change the six-way valve 17 and the six-way valve 21 into the eight-way valve 26 and the eight-way valve 27 respectively, remove the connecting pipe 18 and the connecting pipe 22, and change it into an emptying outlet, as image 3 shown. In the actual pretreatment process, there is no need to perform any operation on the peristaltic pump, and the multi-way valves of each module are controlled by software to realize fully automatic sample pretreatment.

Embodiment 3

[0052] The difference from Example 1 is that this system is only composed of sequentially connected chromatographic column selection module 1, digestion selection module 2, and hydride generation module 4, and the pre-reduction selection module 3 and the pre-reduction agent storage module connected thereto jar 10, as in Figure 4 shown.

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Abstract

The invention relates to a rapid multi-mode element speciation analysis pretreatment system. The system consists of four parts, namely a chromatographic column selection module, a digestion selection module, a pre-reduction selection module and a hydride generation module. By simply controlling multi-way valves in the chromatographic column selection module, the digestion selection module and the pre-reduction selection module, the switching of different chromatographic separation modes can be achieved, the switching between online digestion and non-digestion modes as well as between pre-reduction and non-reduction modes can also be achieved, and the rapid pretreatment operations of speciation analysis on elements with different characteristics can be met. The rapid multi-mode element speciation analysis pretreatment system disclosed by the invention is strong in universality, low in cost and simple in device structure, is simple to operate, and can be widely applied to element speciation analysis instruments related to liquid phase chromatographic separation, online sample digestion, online pre-reduction and hydride generation.

Description

technical field [0001] The invention belongs to the field of instrument analysis and relates to element form analysis, in particular to a fast multi-mode element form analysis pretreatment system. Background technique [0002] Liquid chromatography - hydride generation - atomic spectroscopy or mass spectrometry is widely used in the speciation analysis of arsenic, selenium, mercury, antimony, tellurium and other elements in biological and environmental samples. Because different elements or their forms have different physical and chemical properties, different preprocessing operations are often required for morphological analysis. For example, for chromatographic separation mode, anion exchange mode is often used for arsenic speciation analysis, while reversed-phase chromatography mode is often used for mercury speciation analysis; for hydride generation, arsenate, When analyzing the speciation of arsenate, monomethyl arsenic, dimethyl arsenic, inorganic mercury, selenite, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/06
Inventor 余晓平邓天龙郭亚飞南雪娇郭金玲
Owner TIANJIN UNIV OF SCI & TECH
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