Comparative Analysis Of New And Old Standards For Determination Of Ph Value Of Textile Water Extract
China in recent years
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Enterprises pay more and more attention to the detection of pH value of textiles. The national mandatory standard GB18401-2003 "national textile product basic safety technical specification" also takes pH value as an important safety performance index.
The standard GB/T7573-2002 "determination of pH value of textile water extract" has been unable to adapt to the development of textile detection after years of implementation. Therefore, the professional technical personnel of the textile Standardization Technical Committee Organization inspection organization has been revised and implemented in January 1, 2010.
The new standard has been modified and perfected on the basis of the old standard, and has become more reasonable and practical. It not only guarantees the advanced nature, scientificity and rationality of the technical content, but also facilitates the standardized operation of the testing organization and promotes the improvement of the product quality.
In order to better understand the new standard, this paper summarizes the modifications made by the new standard and compares the two standard rooms.
difference
The analysis is made.
One Standard Sexual files have been added and revised.
In the normative reference document of the new standard, "GB/T6682" water specification and test method for analytical laboratory "has been added, and the" standard atmosphere for moisture conditioning and testing of textiles "has been cancelled" GB/T6529 ".
Years of experience showed that the pH value of textiles did not need to be humidified. Conversely, the pretreatment of moisture could affect the detection results.
Therefore, the new standard has cancelled the operation process of "cutting the good samples in the first level standard atmosphere stipulated by GB/T6529".
2 reagents were added and modified.
The old standard stipulates that when the three grade water or ionic water is at (20 + 2) centigrade, the pH value ranges from 5 to 6.5, and the maximum conductivity is 2 x 10-6s/cm.
Before use, boil 5min to remove carbon dioxide and then seal down.
A large number of experiments have proved that the pH value and electrical conductivity of the three grade water or deionized water will be far beyond the original specified range before boiling.
Therefore, the new standard has been revised to stipulate that distilled water or deionized water can satisfy at least the requirement of GB/T6682 grade three water, that is, the pH value is between 5 and 7.5.
If the pH value is not within the prescribed limits, the glass instrument with stable chemical properties can be redistilled or other methods can be used to achieve the pH value of the water, so it is not necessary to boil 5min before use.
At the same time, the maximum electrical conductivity was eliminated.
In the new standard, the extraction medium and buffer solution of 0.1mol/L potassium chloride solution were added.
As the value of the pH value is larger than that of the test, the stability of the test results is poor. If the potassium chloride solution is added to the test solution, the stability of the indication can be effectively increased.
The new standard clearly stipulates this, so that the testing organization can add potassium chloride solution when testing textiles.
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