Flowing injection disconnected eight-way valve adsorption preenrichment elution method

A technology of flow injection and elution method is applied in the field of combined use of flow injection braided reactor and flame atomic absorption spectrometer, which can solve the problems of many adsorption losses, losses, etc., so as to reduce adsorption loss, lower detection limit, and improve concentration The effect of coefficients

Active Publication Date: 2018-03-30
国家海洋局南海环境监测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In previous studies, heavy metals and complexing agents flowed through a section of pipeline, then through the eight-way valve, and then through the braided reactor. The section of pipeline in front of the eight-way valve was also adsorbed by heavy metal complexes, causing certain losses , and the longer the pipeline, the more adsorption loss

Method used

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  • Flowing injection disconnected eight-way valve adsorption preenrichment elution method
  • Flowing injection disconnected eight-way valve adsorption preenrichment elution method
  • Flowing injection disconnected eight-way valve adsorption preenrichment elution method

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Experimental program
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Effect test

Embodiment 1

[0042] 1. Instruments and reagents

[0043] (1) WFX-210 atomic absorption spectrometer: Beijing Ruili Analytical Instrument Co., Ltd., the measurement wavelength of cadmium is 228.8nm; the acetylene flow rate is 1.5L / min, the air flow rate is 7.0L / min; the slit width is 0.2nm, the sample The lifting rate is 10.0mL / min, the reading mode is continuous, and the reading interval is 0.5s;

[0044] IFIS-D Flow Injection Analyzer: Xi'an Ruimai Analytical Instrument Co., Ltd.

[0045] Braided reactor material: polytetrafluoroethylene, inner diameter 0.5mm, outer diameter 1.0mm, braided along one direction;

[0046] pHS-3C pH meter: Shanghai Yidian Scientific Instrument Co., Ltd.;

[0047] PL3002 electronic balance: Mettler-Toledo Instruments (Shanghai) Co., Ltd.

[0048] (2) Nitric acid, hydrochloric acid, ammonia water, absolute ethanol, dimethylglyoxime and 8-hydroxyquinoline (8-HQ, superior grade): Guangzhou Chemical Reagent Factory;

[0049] Sodium diethyldithiocarbamate (DDTC...

Embodiment 2

[0089] This embodiment is similar to the steps of Embodiment 1, the difference is that the steps of this embodiment are:

[0090] (1) if figure 1 As shown, the pump 1 and the pump 2 are turned on, and the sample solution 3 to be tested or the standard solution of cadmium, the complexing agent solution 4 and the air flow 5 are input into the weaving reactor 6 . Cd 2+ React with the complexing agent online, and the complex is adsorbed on the inner wall of the braided reactor 6 by the centrifugal force of the braided reactor 6, and the duration is 70s.

[0091] (2) Stop pump 1 and pump 2, and take out tubes 15 and 16 for 2 s.

[0092] (3) if figure 2 As shown, pump 1 and pump 2 are turned on for 25s. The air flow 8, 9 and 10 is input into the braiding reactor 6, and the remaining sample solution 3 to be tested or the standard solution of cadmium and the complexing agent solution 4 in the pipes 15 and 16 are emptied.

[0093] (4) Stop pump 1 and pump 2, put tubes 14, 15 and ...

Embodiment 3

[0101] This embodiment is similar to the steps of Embodiment 1, the difference is that the steps of this embodiment are:

[0102] (1) if figure 1 As shown, the pump 1 and the pump 2 are turned on, and the sample solution 3 to be tested or the standard solution of zinc, the complexing agent solution 4 and the air flow 5 are input into the weaving reactor 6 . Zn 2+ React with the complexing agent online, and the complex is adsorbed on the inner wall of the braided reactor 6 by the centrifugal force of the braided reactor 6, and the duration is 60s.

[0103] (2) Stop pump 1 and pump 2, and take out tubes 15 and 16 for 2 s.

[0104] (3) if figure 2 As shown, pump 1 and pump 2 are turned on for 30s. The air flow 8, 9 and 10 is input into the braiding reactor 6, and the remaining sample solution 3 to be tested or the standard solution of zinc and the complexing agent solution 4 in the pipes 15 and 16 are emptied.

[0105] (4) Stop pump 1 and pump 2, put tubes 14, 15 and 16 int...

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Abstract

The invention relates to the field of combination of flowing injection woven reactors and flame atom absorption spectrographs and particularly relates to a flowing injection disconnected eight-way valve adsorption preenrichment elution method. The method comprises the following steps: combining a flowing injection disconnected eight-way valve and a flame atom absorption spectrum method, feeding samples, namely a sample solution to be tested, a complexing agent solution and air, into a woven reactor through an input pipeline in a flowing injection manner, inputting an air flow into the woven reactor to implement emptying, inputting an elution agent into the woven reactor for elution, and detecting in a flame atom absorption spectrograph. Compared with the prior art, the method is relativelyhigh in precision and accuracy, and measurement errors are reduced.

Description

technical field [0001] The invention relates to the field of combined use of a flow injection braiding reactor and a flame atomic absorption spectrometer, in particular to an adsorption pre-enrichment and elution method for flow injection without an eight-way valve. Background technique [0002] The development of analytical chemistry in the past 60 to 70 years is mainly a process of constantly enriching new detection techniques (including readout). However, the technology and equipment of solution processing, which is the basic operation in analytical chemistry and all chemical laboratories, have changed little during this period, and generally still use the operation mode that was basically finalized 200 years ago. Manual operations such as adding liquid, diluting, filtering, stirring, constant volume, aspirating, and titrating are still the most common operations in every chemical laboratory. It is common for the most primitive manual operation and the most advanced elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/72G01N1/28
CPCG01N1/28G01N21/3103G01N21/72
Inventor 王中瑗刘景钦姜重臣张宏康倪志鑫熊小飞叶立金叶建萍李胜勇张灿
Owner 国家海洋局南海环境监测中心
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