Easy & direct pH measurement of paper

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The original idea for paper use was mostly intended for reading and writing, today the paper industry covers a wide range of products; from tissues to variety of packagings.
Paper quality parameters range from general to physiochemical parameter determination.
pH measurement of paper is important during manufacturing and final product stages.
The original idea for paper use was mostly intended for reading and writing, today the paper industry covers a wide range of products; from tissues to variety of packagings.
Paper quality parameters range from general to physiochemical parameter determination.
pH measurement of paper is important during manufacturing and final product stages.
In the paper industry, a pH measurement indicates the chemical stability and permanence of a paper.
It is desirable to manufacture paper that has a neutral or slightly basic pH to aid in the preservation of important documents, publications, and artworks. An acid-free or alkaline paper is able to absorb damaging acid compounds that are naturally formed through aging. Conservators of historical documents (some of which are very valuable or irreplaceable) require a convenient non- destructive method to determine pH.
It is desirable to manufacture paper that has a neutral or slightly basic pH to aid in the preservation of important documents, publications, and artworks. An acid-free or alkaline paper is able to absorb damaging acid compounds that are naturally formed through aging. Conservators of historical documents (some of which are very valuable or irreplaceable) require a convenient non- destructive method to determine pH.
pH of paper and cartons is also important in the food industry. Food packaging often incorporates antimicrobial agents to inhibit microbial activity during distribution and storage conditions. The activity of antimicrobial agents can quickly change with a variation in pH. pH compatibility tests consider food composition, chemistry of the antimicrobial agents used, and packaging material.
pH is also one of the factors that plays a key role in the drying time of the print.
The acidity or alkalinity of the paper pulp depends on the technological process of paper production.
pH of paper and cartons is also important in the food industry. Food packaging often incorporates antimicrobial agents to inhibit microbial activity during distribution and storage conditions. The activity of antimicrobial agents can quickly change with a variation in pH. pH compatibility tests consider food composition, chemistry of the antimicrobial agents used, and packaging material.
pH is also one of the factors that plays a key role in the drying time of the print.
The acidity or alkalinity of the paper pulp depends on the technological process of paper production.
The cellulose fiber has a neutral character pH = 7.2.
Natural (rosin) and artificial resins, aluminum sulfate give an acidic character.
Coated paper can have different pH value depending on acidic/alkaline character of chemicals used.
Examples:
Uncoated paper
pH 4,5 – 7,0
Coated paper
pH 4,8-10,0
The HI99171 portable pH meter together with a HI14143 combination pH electrode (when immersed in a drop of water on the surface of the sample), can determine the pH of the surface with high accuracy and repeatability without the requirement of sample destruction.

HI99171

Leather and Paper
pH Portable Meter
The Hanna Instruments HI99171 is a durable, waterproof, and portable pH and temperature meter designed specifically for leather and paper analysis.
Automatic calibration is performed at one or two points with two sets of buffers. All calibration and measurement readings are automatically compensated for temperature variations.
The HI99171 uses the HI14143 glass body, amplified pH electrode that offers numerous features that improve pH testing for surface measurements.
The split-level LCD displays both pH and temperature readings, along with indicators for reading stability, battery percentage, and calibration instructions.
  •  Automatic Temperature Compensation
  • Automatic Two-Point Calibration
  • Waterproof
Author:
Nives Vinceković Budor
mag.ing.chem.ing.
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