Method for measuring ammonia content in paper packaging materials for water-based ink printing

A paper packaging material and detection method technology, applied in the field of tobacco, can solve the problems of cumbersome operation, complicated instruments, easy to be interfered, etc.

Inactive Publication Date: 2019-07-12
SHANGHAI TOBACCO GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical method and continuous flow method have the disadvantages of complex pretreatment, cumbersome operation and easy interference in the determination of ammonia.
Although ion chromatography has high sensitivity and good selectivity, it takes a long time for analysis and processing and the equipment is relatively complicated.
Not suitable for screening work with a large number of samples

Method used

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  • Method for measuring ammonia content in paper packaging materials for water-based ink printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Determination of ammonia in paper packaging materials printed with water-based ink:

[0039] (1) Preparation of standard solution:

[0040] Using ammonium chloride as the standard substance and hydrochloric acid solution with a concentration of 0.01mol / L as the solvent, prepare standard working solutions with NH4+ concentrations of 0.1, 0.3, 0.5, 1.0, 2.0, 3.0, and 5.0ug / mL.

[0041] HCl aqueous solution: take 0.975ml concentrated hydrochloric acid, dilute it to 1000ml, and prepare a hydrochloric acid solution with a concentration of 0.01mol / L;

[0042] NaOH aqueous solution: weigh 8 g of NaOH solid, add water to dilute to 100 mL, and obtain a NaOH aqueous solution with a concentration of 2 mol / L;

[0043] Salicylic acid solution: take 5g of salicylic acid and 5g of sodium citrate dihydrate, add about 25ml of water, add 27.5ml of NaOH (c(NaOH)=2mol / L), and dilute with water to 100mL to obtain a concentration of 50g / L Salicylic acid solution;

[0044] Sodium nitrosofe...

Embodiment 2

[0052] (1) Preparation of standard solution

[0053] With ammonium chloride as the standard substance and hydrochloric acid solution with a concentration of 0.01mol / L as the solvent, a standard stock solution with a concentration of NH4+ of 100ug / mL was prepared.

[0054] HCl aqueous solution: take 0.975ml concentrated hydrochloric acid, dilute it to 1000ml, and prepare a hydrochloric acid solution with a concentration of 0.01mol / L;

[0055] NaOH aqueous solution: weigh 8 g of NaOH solid, add water to dilute to 100 mL, and obtain a NaOH aqueous solution with a concentration of 2 mol / L;

[0056] Salicylic acid solution: take 5g of salicylic acid and 5g of sodium citrate dihydrate, add about 25ml of water, add 27.5ml of NaOH (c(NaOH)=2mol / L), and dilute with water to 100mL to obtain a concentration of 50g / L Salicylic acid solution;

[0057] Sodium nitrosoferricyanide: Take 0.5g and dissolve it in 100mL of water to obtain a sodium nitrosoferricyanide solution with a concentrati...

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Abstract

The invention relates to the field of tobaccos, in particular to a method for measuring the ammonia content in paper packaging materials for water-based ink printing. The method for detecting the ammonia content in the paper packaging materials includes the steps that a sample is extracted to provide extraction liquid; salicylic acid, sodium nitroferricyanide dihydrate and sodium hypochlorite areadded into the extraction liquid; and through the extraction liquid after sample marking and color rendering, the ammonia content in the paper packaging materials is obtained. The method for detectingthe ammonia content in the paper packaging materials is a method for detecting ammonia in the paper packaging materials through a spectrophotometric method. According to the method for detecting theammonia content in the paper packaging materials, the ammonia is extracted from the paper packaging materials, through a specific reaction, colored products are produced, and quantitative analysis through the spectrophotometric method is realized.

Description

technical field [0001] The invention relates to the field of tobacco, in particular to a method for determining ammonia content in paper packaging materials printed with water-based ink. Background technique [0002] With the increasing social awareness of environmental protection, water-based inks have been widely studied and applied due to their environmental protection and safety advantages. At present, most of the water-based inks on the market are alkali-soluble resin water-based inks. The resin contains -COOH, -OH and other functional groups. Alkaline solvents must be used to ensure dissolution and realize its performance. Ammonia water is generally added to water-based inks as a pH regulator. Control the pH value between 8.0 and 9.5. The ammonia water added in the water-based ink has a strong pungent smell, and the printing process and other environments will be filled with a strong ammonia smell, which not only affects the environment, but also affects the health of...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 王蕾王嘉乐
Owner SHANGHAI TOBACCO GRP CO LTD
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