A method for detecting heavy metal content in activated carbon

A heavy metal and activated carbon technology, which is applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as interference with final colorimetry, difficulty in drawing detection conclusions, and easy discoloration.

Active Publication Date: 2020-05-15
NORTHEAST PHARMA GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high content of heavy metals will lead to the introduction of exogenous heavy metals into the raw materials to be decolorized, which will directly endanger the product quality of the raw materials
The inspection methods reported in the literature at present either do not mask the high-valent iron ions in the sample solution, or add the reducing agent VC for masking. The former interferes with the final colorimetry, and the latter VC is very easy to change color in acidic or alkaline solutions, which also leads to Interfering with the final colorimetry, it is difficult to draw objective and accurate detection conclusions

Method used

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  • A method for detecting heavy metal content in activated carbon
  • A method for detecting heavy metal content in activated carbon
  • A method for detecting heavy metal content in activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking the heavy metal index of activated carbon not greater than 30ppm as an example, the determination of heavy metal content in activated carbon samples is illustrated:

[0024] 1) Preparation of the test solution

[0025] Take 1.0g of activated carbon, add 20ml of 3mol / L hydrochloric acid and 5ml of bromine test solution, boil for 5 minutes, filter, wash the filter residue with 50ml of boiling water, combine the filtrate and washing solution, and evaporate to near dryness. Then add 1ml of 1mol / L hydrochloric acid, 20ml of water, 5ml of sulfurous acid, and boil the solution until all SO is removed. 2 . Dilute to 50ml with water. Take 20ml of the above solution, put it in a 50ml colorimetric tube, add water to make 25ml, use a pH meter or short-range pH test paper as an external indicator, adjust the pH to 3.0-4.0 with 1mol / L acetic acid, and dilute to 40ml with water.

[0026] 2) Preparation of standard solution

[0027] Take 1.2ml of 10ppm lead standard solution...

Embodiment 2

[0044] Establishment of methodology

[0045] 1 Choice of different color eliminators

[0046] 1.1 Using VC as masking agent

[0047] Take 1.0g of activated carbon, add 10ml of dilute hydrochloric acid and 5ml of bromine test solution, boil for 5min, filter, wash the filter residue with 35ml of boiling water, combine the filtrate and lotion, add an appropriate amount of water to make 50ml, shake well, take 20ml of the test solution In a 50ml colorimetric tube, add 1 drop of phenolphthalein indicator solution. And add ammonia test solution dropwise until the solution is light red, add 2ml of pH3.5 acetate buffer solution and appropriate amount of water to make 25ml, add 0.5g of vitamin C to dissolve.

[0048] Standard solution: Take 1.2ml of 10ppm lead standard solution, put it in a 50ml colorimetric tube, add 2ml of pH3.5 acetate buffer, add water to dilute to 25ml, add 0.5g of vitamin C to dissolve.

[0049] Monitoring solution: Take 20ml of the test solution and place it i...

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Abstract

The invention belongs to the field of analysis of pharmaceutical auxiliary materials, and relates to a method for detecting heavy metal content in activated carbon, comprising the following steps: (1) preparation of a test solution: adding sulfurous acid to the test solution; (2) a standard solution (3) preparation of monitoring solution; (4) preparation of thioacetamide-glycerol alkali test solution; (5) assay method: add vinegar respectively in above-mentioned need testing solution, standard solution and monitoring solution salt buffer solution, then add thioacetamide-glycerol alkali test solution, dilute with water, mix evenly, after standing for a period of time, place it on a white background, see through from top to bottom, the displayed color of the test solution should be Not darker than the color of the standard solution, the color of the standard solution should not be darker than the color of the monitoring solution. This method can eliminate the color interference of high-valent iron ions and ensure the objective and accurate detection results.

Description

technical field [0001] The invention belongs to the field of pharmaceutical auxiliary material analysis, and in particular relates to a method for detecting heavy metal content in activated carbon. [0002] technical background [0003] Activated carbon is an excipient used for decolorization in the production of raw materials. Heavy metal content is an important quality indicator that must be controlled. The high content of heavy metals will lead to the introduction of exogenous heavy metals into the raw materials to be decolorized, which will directly endanger the product quality of the raw materials. The inspection methods reported in the literature at present either do not mask the high-valent iron ions in the sample solution, or add the reducing agent VC to mask. The former interferes with the final colorimetry, and the latter VC is very easy to change color in acidic or alkaline solutions, which also leads to Interfering with the final colorimetry, it is difficult to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G01N21/82
CPCG01N21/78G01N21/82
Inventor 刘晨芳邵冬梅冯文宇周秀峰任赫陈赟周岩赵明佟雪娄玉涛唐奎山谢丹
Owner NORTHEAST PHARMA GRP
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