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Quantitative Analysis Method for Determination of Trace Cobalt in Water by Microwave Digestion Faas

A technology of microwave digestion and quantitative analysis, which is applied in thermal excitation analysis, material excitation analysis, preparation of test samples, etc. It can solve the problems of many operation steps, large amount of reagents, cumbersome process, etc., and achieve high accuracy and precision , improve the sensitivity of the measurement, and the effect of a simple test process

Inactive Publication Date: 2016-02-24
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In "Cloud Point Extraction-High Performance Liquid Chromatography Determination of Copper and Cobalt" (Guangdong Trace Element Science, 2009, 16(3): 48-53), the detection limit of cobalt can reach 0.8μg / L, but the high performance liquid Phase chromatography, analysis costs, instrument maintenance costs, and operator skills are all strictly limited, which is not conducive to popularization and use
[0021] The above-mentioned method for determining trace cobalt in water may affect the applicability of the method due to the interference of coexisting components, or the operation steps are many and the process is cumbersome, or the use of large and expensive instruments leads to high analysis and instrument maintenance costs, or the amount of reagents is large or Toxic and pollute the environment and operators, or the analysis takes a long time and other disadvantages, so it is not suitable for popularization and application

Method used

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  • Quantitative Analysis Method for Determination of Trace Cobalt in Water by Microwave Digestion Faas
  • Quantitative Analysis Method for Determination of Trace Cobalt in Water by Microwave Digestion Faas
  • Quantitative Analysis Method for Determination of Trace Cobalt in Water by Microwave Digestion Faas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Determination of cobalt content and recovery rate experiment in the waste liquid of the environmental engineering laboratory of the School of Petrochemical Engineering, Shenyang University of Technology

[0087](1) Microwave digestion pretreatment of samples: Accurately pipette 5.00ml water samples from five waste liquid buckets in the laboratory into microwave digestion tanks (take 3 copies of each sample for parallel test, and take 3 copies for recovery rate experiment at the same time ), add 8.0ml of 70.0% nitric acid, 1.0ml of 40.0% hydrofluoric acid and 2.0ml of 30.0% hydrogen peroxide respectively, cover the lid, insert it into the protective cover, and put a burst membrane on it, and prepare a reagent blank solution at the same time, and then put it into microwave digestion Digest the sample in the instrument. Digestion pressure 2.4MPa, digestion time 20min. After the digestion program is over, when the temperature reaches 40°C, turn on the microwave digestion i...

Embodiment 2

[0099] Determination of cobalt content and recovery rate in tap water of a residential area in Hongwei District, Liaoyang City:

[0100] (1) Sample evaporative concentration and microwave digestion pretreatment: first turn on the faucet and let the water flow for 5 minutes, connect 2000ml (5 parts) of tap water with a 2000ml beaker, heat and evaporate to 10.0ml in an electric furnace. Take 5.00ml of concentrated water sample into the digestion tank, add 8.0ml of 70.0% nitric acid, 1.0ml of 40.0% hydrofluoric acid and 2.0ml of 30.0% hydrogen peroxide respectively, cover the lid, insert it into the protective cover, and put the burst membrane, Prepare a reagent blank solution at the same time; put it into a microwave digestion apparatus for sample digestion: the digestion pressure is 2.4MPa, and the digestion time is 15min. After the digestion program is over, when the temperature reaches 41°C, turn on the microwave digestion apparatus, take out the digestion tank and transfer t...

Embodiment 3

[0111] Determination of Cobalt Content and Recovery Rate Experiment in Taizi River Water of Liaoyang City and Jinglong Lake Water of Shenyang University of Technology Liaoyang Campus

[0112] (1) Sample concentration and microwave digestion pretreatment: Accurately pipette the detected leaves and sundries and filter them through a filter membrane with a pore size of 0.45 μm to remove suspended particles. March, April, and May 2011 2000.0ml of water sample collected on a certain day was placed in a 2000ml beaker (3 copies of each sample were used for parallel experiments, and 3 copies were taken at the same time and at the same place for recovery experiments); heated by electric furnace, evaporated and concentrated to 10.0ml (n 1 =200). Take 10 digestion tanks, add 5.00ml of concentrated water samples to 9 digestion tanks, add 8.0ml of 70.0% nitric acid, 1.0ml of 40.0% hydrofluoric acid and 2.0ml of 30.0% hydrogen peroxide, cover the lids and insert protection Set, and put the...

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Abstract

The invention relates to a quantitative analysis method for determining trace cobalt in water by FAAS method of microwave digestion. Activator, according to the linear relationship between the absorbance difference measured by the water sample measurement system and the reagent blank solution on the flame atomic absorption spectrometer and the cobalt content, the cobalt content is obtained according to the regression equation or the working curve; it has a digestion pretreatment process Simple, less reagent consumption, environmental protection, time-saving, high efficiency; high analysis accuracy and sensitivity; low analysis cost and instrument maintenance, etc., is a fast, accurate, sensitive, and widely applicable method for the determination of trace cobalt in water Analytical method.

Description

Technical field: [0001] The invention relates to a quantitative analysis method for determining trace cobalt in water, in particular to microwave digestion treatment technology for trace cobalt in water and flame atomic absorption spectrometry using polyethylene glycol 400 (PEG-400) as an activator A test technique for the determination of trace cobalt in water, specifically, a FAAS assay for the determination of trace cobalt in water. Background technique: [0002] Cobalt is an important strategic metal. Cobalt and its alloys are widely used in electrical machinery, machinery, chemical industry, aviation and aerospace and other fields. Cobalt is also one of the essential trace elements for humans, animals and plants. Cobalt in the human body mainly through the formation of vitamin B 12 Play biological roles and physiological functions. In addition, cobalt has important physiological effects on iron metabolism, hemoglobin synthesis, cell development and enzyme functions. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71G01N1/44
Inventor 赵丽杰赵丽萍李良杨旭鹏白晓琳关晓彤吴全才陈宏
Owner SHENYANG POLYTECHNIC UNIV
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