ISO-1264-1980.pdf
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1、International Standard 1264 0 +Qlii?i? INTERNATIONAL ORGANIZATION FOR STANDARDlZATlON*MEYHAPOAHAR OPrAHM3ALMR I-IO CTAHAFTH3Al b) 50 f 2 ml of sodium chloride solution. Stopper the flask and place it on the shaker (4.5). Agitate rapid- ly for 60 Z!Z 5 min. Allow the flask to stand for 5 to 10 min to
2、 allow the resin to settle (below or on the surface of the liquid). Then, using the pipette (4.21, transfer approximately 30 to 40 ml of the liquid above or below the resin into the beaker (4.31, which has. been rinsed beforehand with the sodium chloride solution. (In cases where a large amount of f
3、oam has been formed, filtering may be necessary before pipetting.) Measure the pH of the aqueous solution at a temperature of 23 F2 OC by means of the pH meter (4.1). Carry out two determinations. Express the values in pH units to one decimal place. If the difference in duplicate determinations is g
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- ISO 1264 1980
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