GB/T 32379-2015Determination of mineral wool and its products formaldehyde emission (English PDF)

3.1 Principle

At the bottom of the dryer is placed crystallizing dish filled with distilled water, the upper part of the sample in a crystallizing dish, placed in a sealed environment 20 °C, 24h after

Determination of the concentration of formaldehyde.

3.2 Reagents

The standard test water line with GB/T 6682 stipulated a water. Unless otherwise stated the following test, the dryer method used

Agents were of analytical grade and above.

a) sulfuric acid solution. 1mol/L;

b) hydrochloric acid. rho = 1.19g/cm3;

c) ammonium acetate solution. Weigh 200g of ammonium acetate (C2H3O2NH4), dissolved in water transferred to 1000mL volumetric flask, dilute with water

Explanation to the mark, shake;

d) acetylacetone solution. 4mL/L;

e) iodine (I2 is) standard solution. 0.05mol/L, calibrated before use;

f) starch indicator. 10g/L, the time is now equipped with;

g) sodium thiosulfate (Na2S2O3) standard titration solution. 0.1mol/L, sodium thiosulfate weighed 26g in 500mL beaker, add

The freshly boiled and cooled water, completely dissolved, 0.05g of sodium carbonate (to prevent decomposition) and 0.01g mercuric iodide (preventing

Sp), and then diluted with freshly boiled and cooled water to 1L, filled in a brown bottle grinding mouth, shake and let stand 8d ~ 10d, filter

After calibration.

Calibration. Weigh in 120 °C drying to constant weight basis of potassium dichromate (K2CrO7) 0.10g ~ 0.15g, accurate to 0.1mg, placed 500mL

Iodine bottle, add 25mL water, shake to dissolve, plus 2g of potassium iodide and hydrochloric acid 5mL, immediately stuffed with cork, bottle liquid seal

Mouth, shake in dark place for 10min. Add water 150mL, sodium thiosulfate standard titration solution was titrated to be calibrated to the grass was green, […]