Determination method for chloride ions of foods

A method for measuring chloride ions, which is applied in the field of food analysis, can solve the problems of high price of silver nitrate medicines, difficulty in determining the orange-red end point, and difficulty in judging the end point. Effect

Inactive Publication Date: 2010-06-23
HENAN AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Wherein the molar titration method is a national promulgated standard, but this method has the following disadvantages: (1) a white precipitate is generated during the measurement process, and the soy sauce solution is dark red at the same time, which makes it difficult to determine the orange-red end point in the titration process; (2) titration The silver nitrate medicine used is expensive and costly
The chemical assay is in Fe + In the presence of Hg(SCN) 2 with Cl - The reaction forms and Cl - Equivalent amount of SCN - with Fe 3+ combined into Fe(SCN) 3 The red compound, colorimetric, quantification of Cl in the sample - On the one hand, this me

Method used

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  • Determination method for chloride ions of foods
  • Determination method for chloride ions of foods
  • Determination method for chloride ions of foods

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] The mensuration of chloride ion content in the mustard mustard of embodiment 1

[0021] 1Main instruments and experimental drugs

[0022] PXD-3 digital ion meter (Jiangsu Tai County Radio Factory)

[0023] KQ-250E Medical Ultrasonic Cleaner (Kunshan Ultrasonic Instrument Co., Ltd., Jiangsu Province)

[0024] pCl-1 Chloride Ion Selective Electrode (Shanghai Precision Scientific Instrument Co., Ltd.)

[0025] 217-type double-salt bridge calomel electrode (Shanghai Precision Scientific Instrument Co., Ltd.)

[0026] SYZ-A Medical Quartz Sub-boiling High Purity Water Distiller (Jiangsu Jintan Quartz Glass Instrument Factory)

[0027] pH glass electrode (Shanghai Precision Scientific Instrument Co., Ltd.)

[0028] Electronic Balance (Beijing Sartorius Balance Co., Ltd.)

[0029] Water: secondary quartz sub-boiling double distilled water

[0030] Glacial acetic acid (Shanghai Shiyi Chemical Reagent Co., Ltd.) Sodium nitrate (Beijing Hongxing Chemical Factory)

[0031] ...

Example Embodiment

[0063] The mensuration of chloride ion content in embodiment 2 soy sauce

[0064] 1Main instruments and experimental drugs

[0065] With embodiment 1.

[0066] 2 Preparation of main reagents

[0067] With embodiment 1.

[0068] 3 Determination method

[0069] Take 2-10.00mL of soy sauce, add 5.00mL of 1mol / mL nitric acid into a 50ml volumetric flask, cap it and extract in an ultrasonic cleaner for 2min, then add 25.00mL of TISAB, dilute to the mark with water, and mix thoroughly. Measured under the same conditions as the standard solution, measured with a PXD-3 digital ion meter, and directly read the concentration value of chloride ions in the 50mL volumetric flask from the digital display. Directly read the Cl in the 50mL volumetric flask from the digital display - After the number of milligrams of ions, if you want to quickly get the content of chloride ions in soy sauce, you can use the following formula to calculate: In the formula, x is the amount of chloride ion ...

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Abstract

The invention relates to a determination method for chloride ions of foods, which belongs to the technical field of food analysis. The method takes a chloride ion selective electrode as an indicator electrode and a two-liquid junction saturated calomel electrode as a reference electrode which are inserted in a sample solution to form a working battery, and when the concentration of chloride ions is in a range of 1 to 10-5g / L, the battery electromotive force is linear with the logarithm of chloride ion activity, and the concentration of the chloride ions of the foods is determined by a digital ion meter. The method of the invention adopts ultrasonic extraction and direct reading concentration method coupling techniques to determine the chlorine content in samples, and the used ultrasonic cleaning device greatly improves extraction speed; and the method has the obvious advantages of difficult sample contamination, low reagent consumption, simpleness and rapidity, accurate and reliable result.

Description

technical field [0001] The invention belongs to the technical field of food analysis, in particular to a method for determining chloride ions in food. Background technique [0002] At present, the determination methods of sodium chloride in food include chemical determination, coulometric analysis and molar titration. Wherein the molar titration method is a national promulgated standard, but this method has the following disadvantages: (1) a white precipitate is generated during the measurement process, and the soy sauce solution is dark red at the same time, which makes it difficult to determine the orange-red end point in the titration process; (2) titration The silver nitrate medicine used is expensive, and the cost is high. The chemical assay is in Fe + In the presence of Hg(SCN) 2 with Cl - The reaction forms and Cl - Equivalent amount of SCN - with Fe 3+ combined into Fe(SCN) 3 The red compound, colorimetric, quantification of Cl in the sample - On the one han...

Claims

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Application Information

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IPC IPC(8): G01N27/406G01N27/49
Inventor 范彩玲高向阳李伟刘春霞
Owner HENAN AGRICULTURAL UNIVERSITY
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