Determination of trace amounts of acrylamide/acrylic acid copolymer in wastewater by the tannic acid turbidimetry.

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  • タンニン酸比濁法による下水処理水中の微量のアクリルアミドーアクリル酸共重合物系高分子凝集剤の定量
  • タンニンサン ヒダクホウ ニ ヨル ゲスイ ショリスイチュウ ノ ビリョウ ア

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Description

The tannic acid turbidimetric method for the determination of cationic polyelectrolyte in wastewater developed by Attia et al. {Br. Poly. J., 7, 135 (1975)} can be applied acrylamide/acrylic acid copolymer by increasing the amounts of the reagents forming turbidity. Procedure: add 15ml of 0.1% tannic acid soln., 20ml of 2M sodium chloride soln. and 1ml of 0.1% EDTA soln. to 10ml of sample water in a 50ml measuring flask. Allow it to stand for an hour at 20°C. Measure the turbidity at 554nm using 2cm cell against a blank. The calibration curves were linear over the concentration range from 0 to 20mg/l for a copolymer (acrylamide/acrylic acid =80/20), from 0 to 30mg/l for a copolymer (acrylamide/acrylic acid=70/30), from 0 to 20mg/l for a copolymer (acrylamide/acrylic acid=60/40) and from 0 to 20mg/l for sodium polyacrylate. The detection limits were 0.85, 2.0, 1.3 and 2.9mg/l for the above mentioned copolymers, respectively. Turbidity was dependent on the temperature and time. The determination method developed here can be explained by Schulze-Hardy's law. However, the mechanism of the determination method for anionic polyelectrolyte may be differed from that for the cationic one.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 40 (6), 295-300, 1991

    The Japan Society for Analytical Chemistry

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