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Ion selective electrode for determining trace chromium (III) as well as preparation method and application thereof

An ion-selective and electrode technology, which is applied in the field of ion-selective electrodes for the determination of trace chromium (III) and its preparation, can solve the problems of difficulty in wide application, cumbersome operation and high cost, and achieves high sensitivity, simple process operation and linearity. wide range of effects

Active Publication Date: 2014-01-08
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional detection methods for chromium-containing wastewater include atomic absorption spectrometry (AAS) and inductively coupled plasma (ICP). For the analysis of a large number of environmental samples, these methods have the disadvantages of cumbersome operation, long time, and high cost, and are difficult to be widely used.

Method used

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  • Ion selective electrode for determining trace chromium (III) as well as preparation method and application thereof
  • Ion selective electrode for determining trace chromium (III) as well as preparation method and application thereof
  • Ion selective electrode for determining trace chromium (III) as well as preparation method and application thereof

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Embodiment approach

[0023] According to a typical embodiment of the present invention, the preparation method of an ion-selective electrode for determining a trace amount of chromium (III) comprises the following steps: S1, synthesizing o-vanillin acetal-1,3-dithiosemicarbazide Schiff base; and S2 1. The ion-selective electrode was prepared by using a sensitive membrane reagent containing o-vanillin-1,3-dithiosemicarbazide Schiff base.

[0024] Carbon paste-modified chromium(Ⅲ ) ion-selective electrode. The process is simple to operate, and the ion-selective electrode prepared by the method has good ion selectivity to trace chromium (Ⅲ), high sensitivity, wide linear range, low detection limit and long service life of the electrode.

[0025] According to a preferred embodiment of the present invention, the step of synthesizing o-vanillin-1,3-dithiosemicarbazide Schiff base includes: S11, weighing 1,3-dithiosemicarbazide, adding water to dissolve and preparing a weak Acidic to obtain the first s...

Embodiment 1

[0034] (1) Synthesis of o-vanillin-1,3-dithiosemicarbazide

[0035] Weigh 2.12g (0.02mol) of 1,3-dithiosemicarbazide into a 250mL three-neck flask, add 70ml of distilled water containing 3mL of acetic acid, and stir with slight heat until the solid dissolves; dissolve 6.08g (0.04mol) of o-vanillin in 100ml of ethanol was slowly added dropwise to the above 1,3-dithiosemicarbazide solution using a constant pressure dropping funnel, and the color of the solution gradually changed from colorless to bright yellow.

[0036] After the dropwise addition is completed (about 30 min), continue heating to reflux for 2 h, cool to room temperature, and filter to obtain a light yellow solid powder. The resulting solid was washed repeatedly with hot distilled water, recrystallized with ethanol for 3 to 4 times, and dried in vacuum to obtain the target product o-vanillin acetal-1,3-dithiosemicarbazide Schiff base (hereinafter referred to as VADT) 4.03 g, yield 65.5%. The structural formula o...

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Abstract

The invention discloses an ion selective electrode for determining trace chromium (III) as well as a preparation method and application thereof. The method comprises the following steps: S1, synthesizing an o-vanillin shrinkage-1,3-dethiosemicarbazide schiff base; S2, preparing the ion selective electrode by using an o-vanillin shrinkage-1,3-dethiosemicarbazide schiff base doped sensitive film reagent. Through synthesizing an o-vanillin shrinkage-1,3-dethiosemicarbazide schiff base, the ion selective electrode for determining trace chromium (III) is prepared by using a sensitive film reagent containing the o-vanillin shrinkage-1,3-dethiosemicarbazide schiff base. The process is simple in operation; an ion selective electrode prepared by using the method disclosed by the invention is good in ion selectivity to trace chromium (III), high in sensitivity, wide in linear range, low in detection limit and long in electrode service life.

Description

technical field [0001] The invention relates to the technical field of electrode preparation, in particular to an ion-selective electrode for determining trace amounts of chromium (Ⅲ) and its preparation method and application Background technique [0002] Chromium is a pollutant commonly found in water bodies, and it is more harmful to crops and microorganisms. Traditional detection methods for chromium-containing wastewater include atomic absorption spectrometry (AAS) and inductively coupled plasma (ICP). For the analysis of a large number of environmental samples, these methods have the disadvantages of cumbersome operation, long time, and high cost, and are difficult to be widely used. As one of the important means of information transformation, chemical sensor is a measuring device that converts the chemical information of the measured and controlled object into an electrical signal with a definite corresponding relationship to meet the requirements of information trans...

Claims

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Application Information

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IPC IPC(8): G01N27/333
Inventor 朱伟崔普选
Owner CHNA ENERGY INVESTMENT CORP LTD
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