Comparison and Analysis of Testing Equipment for Formaldehyde Testing of Textiles
In the textile industry, there are two kinds of testing equipment formaldehyde content detection equipment related equipment, one is the standard testing equipment spectrophotometer, one is relatively simple formaldehyde tester, formaldehyde tester detection speed, easy operation, high efficiency , Then the accuracy of its test value and what! Here the two similarities and differences between the introduction:
Two kinds of textile formaldehyde content detection equipment of the same point: the two are the same, the sampling standard and the same number of samples, reagent preparation and style preparation of the same, pre-treatment step and process is basically the same, that is, the preparation of extract, The preservation of the sample is the same, and the ketone test is the same
Differences between the two:
1, the preparation of different methods of extraction:
① spectrophotometer preparation of the extraction method: First, the broken sample 1g were placed in 250mL with stopper iodine bottle, add 100ML three water, cover the lid, placed in (40 ± 2) ℃ water bath Shake (60 ± 5) min, filter with a filter to another iodine bottle, remove the extract with a pipette and 5mL acetylacetone reagent into the tube to shake, then remove the 5mL three water and 5mL acetylacetone reagent Add another tube to shake, then remove the 5mL three water and 5mL extract into another tube shake, continue to put (40 ± 2) ℃ water bath (30 ± 5) min,
② formaldehyde tester Preparation of the extraction method: First, the broken sample 1g were placed in 250mL with stopper iodine bottle, add 100ML three water, cover the lid, placed in (40 ± 2) ℃ water bath Shake (60 ± 5) min, filter with a filter to another iodine bottle, remove the 5mL extract with a pipette and 1mL acetylacetone reagent into the tube shake, and then remove the 5mL three water and 1mL acetylacetone The reagent was placed in another tube and shaken, and then 5 mL of the extract and 1 mL of the third water were placed in another tube and shaken, and the mixture was placed in (40 ± 2) ° C for 15 min
2, the test results and efficiency are different
① spectrophotometer prepared after the test fluid is measured out of the test solution of the absorbance, but also according to the corrected absorbance value, through the work curve to detect formaldehyde content, each week but also every week to do calibration curve and standard Curve of the school, more trouble, cumbersome, especially the curve, sometimes also did not succeed, to analyze the reasons and so on
② formaldehyde tester to detect the results directly to the formaldehyde content, built-in standard curve, automatic calibration, without the need for weekly calibration, when necessary, with the standard solution can be verified, so easy to operate, easy to grasp the detection method and instrument operation Method, fast, efficient, can reduce the human error.
3, the results calculated in different ways
Spectrophotometer and formaldehyde tester two instruments need to be measured different liquid, the instrument is slightly different, so the calculation is different, spectrophotometer test results are more complex, but also some trouble, and formaldehyde tester test results directly Is the content of formaldehyde, do not need to do other calculations, the instrument shows the direct result of the formaldehyde content of the sample.
But the standard requirements of the instrument is a spectrophotometer, relatively high accuracy, stability, the results are more accurate, the system error is small, high accuracy, the following is the two instruments on the same standard sample test results, from the results , The spectrophotometer test results and the standard value is closer, the deviation is small, the accuracy of teaching high
Based on the above analysis, personally think that the requirements of the enterprise is not too strict laboratory, you can use formaldehyde tester, so cost savings, easy operation, high efficiency, the results can be used as a dye factory a reference value. For third-party laboratories and some government testing agencies must be in accordance with the standard requirements of the configuration and use of equipment, so as to have accurate, credible, real test results