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Detection method and device for residue in sample

A detection method and residue technology, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of prolonged detection time, measurement errors, and cumbersome absorption titration steps. , to achieve the effect of simplifying operation, ensuring accuracy and shortening detection time

Active Publication Date: 2013-08-07
GANSU CHEEZHENG TIBETAN MEDICINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art food, sulfite residue detection method in medicinal materials SO 2 The absorption titration steps of the method are cumbersome, resulting in the prolongation of the detection time, and the titration process is likely to cause measurement errors, thereby providing a sulfur dioxide detection method with simple operation, short detection time, and suitable for rapid on-site detection. Hanging titration device for gas detection

Method used

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  • Detection method and device for residue in sample

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Effect test

Embodiment 1

[0044] (1) Accurately weigh 1.25 g of sodium sulfite solid powder, add it into a 100ml volumetric flask for ultrasonic dissolution, and dilute with water to obtain a standard stock solution of sodium sulfite; take 0, 1, 2, 3, 4, 5, 6, 7 , 8 ml of the standard stock solution, which are successively fixed to volume in 100ml volumetric flasks numbered A0, A1, A2, A3, A4, A5, A6, A7, A8, respectively to obtain 0, 125, 250, 375, 500, 625, 750, 875, 1000 μg / ml sodium sulfite standard solution.

[0045] (2) Prepare an aqueous solution of methyl orange with a mass concentration of 0.05%.

[0046] (3) Utilize the suspended titration device of the present invention to test and formulate a standard color comparison card, first extract the described methyl orange solution of 5ml with a syringe, and install a solvent filter head at the liquid suction port of the syringe, so that the syringe and The solvent filter head is sealed and connected to form the indicator solution storage used in ...

Embodiment 2

[0050] (1) Accurately weigh 1.25 g of sodium sulfite solid powder, add it into a 100ml volumetric flask for ultrasonic dissolution, and dilute with water to obtain a standard stock solution of sodium sulfite; take 0, 1, 2, 3, 4, 5, 6, 7 , 8 ml of the standard stock solution, which are successively fixed to volume in 100ml volumetric flasks numbered A0, A1, A2, A3, A4, A5, A6, A7, A8, respectively to obtain 0, 125, 250, 375, 500, 625, 750, 875, 1000 μg / ml sodium sulfite standard solution.

[0051] (2) Prepare a saturated aqueous solution of potassium iodate-starch.

[0052] (3) Utilize the suspended titration device of the present invention to test and formulate a standard color comparison card, first extract 5ml of the saturated aqueous solution of potassium iodate-starch with a syringe, and install a solvent filter head at the suction port of the syringe , connect the syringe to the solvent filter head tightly to form the indicator solution storage used in this step for futu...

Embodiment 3

[0056](1) Accurately weigh 0.25 g of sodium sulfite solid powder, add it into a 100ml volumetric flask for ultrasonic dissolution, and dilute with water to obtain a standard stock solution of sodium sulfite; take 0, 2, 4, 6, 8, 10, 12, 14 , 16, 18, and 20 ml of the standard stock solution were fixed to volume successively in 100ml volumetric flasks numbered A0, A1, A2, A3, A4, A5, A6, A7, A8 to obtain 0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500 μg / ml sodium sulfite standard solution.

[0057] (2) Prepare an aqueous solution of methyl orange with a mass concentration of 0.02%.

[0058] (3) Utilize the suspended titration device of the present invention to test and formulate a standard color comparison card, first extract the described methyl orange solution of 5ml with a syringe, and install a solvent filter head at the liquid suction port of the syringe, so that the syringe and The solvent filter head is sealed and connected to form the indicator solution storage used ...

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Abstract

The invention discloses a dangling titration device used for gas detection and a detection method used for detection by utilizing the device. The dangling titration device comprises an indicating liquid memory and a gas generator, wherein an opening used for hanging drops of indicating liquid is arranged at the tail end of the indicating liquid memory; the gas generator is in a sealed connection with the tail end of the indicating liquid memory; and the opening is formed in the gas generator. The dangling titration method is adopted, and the device specially used for dangling titration is provided, therefore, the drops of the indicating liquid directly react with gas generated by the sample, tedious steps that gas is absorbed by utilizing liquid and then titration is carried out in normal operation are avoided, operations are simplified, the detection time is shortened, and error caused by influence of environment on workers during detection with the titration method is avoided in the on-the-spot operation process.

Description

technical field [0001] The invention relates to a method for detecting residues in a sample and a device used in the method, belonging to the technical field of gas detection. Background technique [0002] Commonly used methods for gas detection include spectrophotometry, gas chromatography, ion chromatography, colorimetry, and volumetric titration. When spectrophotometry and chromatography are used to quantitatively detect gases, analytical instruments such as spectrophotometers and chromatographs are generally used, and these chemical analysis instruments need to be used under stable environmental conditions, and a long period of time is required before use. Time-consuming debugging process, which is suitable for use in the laboratory, is not suitable for on-site rapid detection. The colorimetric method is based on the color reaction of the colored compound, and the method of determining the content of the component to be tested is determined by comparing or measuring the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 王维波刘鸿雁
Owner GANSU CHEEZHENG TIBETAN MEDICINE CO LTD
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