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1、International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON*MEW,lYHAPO i, i ; $ P .f, :“(I” $4Fg;f; Paraformaldehyde for industrial use - Methods of test - Determination of aldehyde content - Titrimetric method ParaformaldtShyde r) usage industriel - Mbthodes d essai - Dosage de l ald.Ghyd
2、e - AMhode titrimktrique First edition - 1981-05-15 ,: I ! i! p The aldehyde content, expressed as a percentage by mass of formaldehyde (HCHO), is given by the formula 100 v x 0,030 03 x - = 3,003 x v m m where m is the mass, in grams, of the test portion (6.1); 0,030 03 is the mass, in grams, of fo
3、rmaldehyde cor- responding to 1 ml of sulphuric acid solution, c(1/2 H2S04) = 1 mol/l exactly. NOTE - If the concentration of the standard volumetric solution used is not exactly as specified in the list of reagents, an appropriate correc- tion should be made. Annex IS0 publications relating to para
4、formaldehyde for industrial use IS0 1391/l - General. IS0 1391/2 - Determination of ash. IS0 1391/3 - Determination of iron content - 2,2 -Bipyridyl photometric method. IS0 1391/4 - Determination of water-insoluble matter. IS0 1391/5 - Determination of aldehyde content - Titrimetric method. ? 2 -,-,-