In order to determine trace amount of fluorescent brightening agent (FBA) in dilute detergent solution which contains FBA of bis-Stilbene series, the method to concentrate and determine FBA, using cellulose powder as an adsorbent, were investigated.
With the application of this method to dilute built-detergent solution which contains Uvitex 3257, the following results were obtained;
(1) The higher the dyebath temperature when FBA was adsorbed, the more the recovery % of the FBA in the bath.
(2) The greater the amount of sodium chloride as a promoter in the solution, the more the amount of FBA adsorbed.
(3) Under the dyebath temperature of 97±3°C and with the application of sodium chloride 10% o. w. f. as a promoter, it was found that nearly quantitative recovery of the FBA was obtained after successive (1 to 3 times) adsorption treatment for the solution which contains trace amount of FBA.
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