Rapid detection method of ionic liquid content

A technology of ionic liquid and detection method, which is applied in the field of analysis and detection, can solve the problems of inapplicability to conventional rapid analysis, many influencing factors of ultraviolet spectroscopy, and long time required for thermogravimetric analysis, so as to achieve short detection reaction time and obvious results , the effect of concise quantitative determination

Active Publication Date: 2021-01-29
JIANGSU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, each detection method has its disadvantages
Chromatography is complex in operation, expensive in equipment, and high in analysis cost; thermogravimetric analysis takes a long time and cannot be applied to routine and rapid analysis; ultraviolet spectroscopy has many influencing factors and is suitable for pure ionic liquids, and is not suitable for containing other organic substances in the ultraviolet region. Absorbed mixture sample

Method used

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  • Rapid detection method of ionic liquid content
  • Rapid detection method of ionic liquid content

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1 utilizes this method to analyze the tap water sample that adds ionic liquid standard sample

[0020] (1) Preparation of detection reagent: Weigh 10 g of sodium tungstate, add 5 mL of 85% (mass concentration) phosphoric acid, add 10 mL of concentrated hydrochloric acid, heat to dissolve, and then dissolve in 100 mL of water;

[0021] (2) Preparation of the working curve: take 1-butyl-3-methylimidazolium tetrafluoroborate as the standard, dissolve in water, take 4 mL of the ionic liquid with a concentration of 0-200 μg / mL in a test tube, add 1mL of the detection reagent was reacted at 25°C for 6-10min, and the absorbance was detected at a wavelength of 600nm. Taking the concentration of ionic liquid as the abscissa and the absorbance value as the ordinate, the working curve is obtained.

[0022] (3) Sample collection and pretreatment: Take six tap water volumes of 10 mL, add ionic liquids 1-butyl-3-methylimidazolium tetrafluoroborate, 1 -Butyl-3-methylimida...

Embodiment 2

[0026] Embodiment 2 utilizes this method to analyze the soil sample that adds ionic liquid standard sample

[0027] (1) Preparation of detection reagent: Weigh 10 g of sodium tungstate, add 5 mL of 85% phosphoric acid, add 10 mL of concentrated hydrochloric acid, heat to dissolve, and then dissolve in 100 mL of water;

[0028] (2) Preparation of the working curve: take 1-butyl-3-methylimidazolium tetrafluoroborate as the standard, dissolve in water, take 4 mL of the ionic liquid with a concentration of 0-200 μg / mL in a test tube, add 1mL of the detection reagent was reacted at 25°C for 6-10min, and the absorbance was detected at a wavelength of 600nm. Taking the concentration of ionic liquid as the abscissa and the absorbance value as the ordinate, the working curve is obtained.

[0029] (3) Sample collection and pretreatment: Take six parts of soil with a mass of 1 g, add 10 mL of distilled water to each, and add ionic liquid 1-butyl-3-methylimidazolium tetrafluoroethylene w...

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Abstract

The invention discloses a rapid detection method of an ionic liquid content, and belongs to the field of analysis and detection. A detection reagent is prepared from sodium tungstate, 85% phosphoric acid and concentrated hydrochloric acid, a working curve takes 1-butyl- 3-methylimidazole tetrafluoroborate as a standard, after 4mL of ionic liquid with different concentrations reacts with 1mL of thedetection reagent, a light absorption value is detected at the wavelength of 600nm, and the working curve is made. After a pretreatment supernatant of a water body or soil sample reacts with the detection reagent, the absorbance of the system is measured, and the content of the ionic liquid in the sample is obtained according to the working curve and the dilution ratio. The detection reagent usedin the method is convenient to prepare, low in price and easy to obtain, instruments are common, the detection reaction time is short, the result is obvious, and the method can provide rapid, simple,convenient and economical quantitative determination for quality inspection departments and production enterprises.

Description

technical field [0001] The invention belongs to the field of analysis and detection, in particular to a rapid detection method for the content of ionic liquids. Background technique [0002] Ionic liquids, also known as room temperature molten salts, are salts that are completely composed of organic positive ions and inorganic or organic negative ions and are in a liquid state at or near room temperature. It has good thermal stability, low vapor pressure, colorless, odorless and It has the advantages of not being volatile, and shows good solubility for inorganic, organic and polymer materials. Based on its different anion and cation compositions, the properties of the ionic liquid can be changed by adjusting the types of anion and cation in the ionic liquid according to the needs, so as to meet the needs of various practical applications. Ionic liquids have lower direct hazards than conventional organic solvents and can be recycled, so they are known as green solvents. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31Y02P20/54
Inventor 黄六容贾士芳丁双代春华
Owner JIANGSU UNIV
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