赤外吸収法による廃水中の油分定量

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タイトル別名
  • Determination of oil in waste water by infrared absorption method
  • セキガイ キュウシュウホウ ニヨル ハイスイチュウ ノ ユブン テイリョウ

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In order to study the discrepancy between the oil content in waste water measured with nondispersive infrared analyzer (NDIR) and infrared spectrophotometer (IRSP), the carbon tetrachloride solution of various mineral oils, vegetable oils, and animal oils under the same concentration were measured with them. If B heavy oil was used as a standard material, the deviation of the oil content were about ±20 % both with NDIR and IRSP. The coefficients of variation of the oil content obtained with NDIR and IRSP were 10.7 % and 8.5 %, respectively (Table 2). The correlation coefficient between the oil content obtained with NDIR and the absorbance at 2925 cm-1 obtained with IRSP, the oil content obtained with NDIR and the mean absorbance of three bands (at 2960 cm-1, at 2925cm-1, and at 2850cm-1) obtained with IRSP, and the oil content obtained with NDIR and the area of spectrum at the region from 2800 to 3000 cm-1 obtained with IRSP were 0.21, 0.75, and 0.94 (Fig. 2, 3, and 4), respectively. It is necessary to take it into account that there is some difference between the data obtained with NDIR and IRSP for the oil content in waste water. B heavy oil, cetane, and standard mixture (a mixture of 37.5 % isooctane, 37.5 % cetane, and 25 % benzene) used as standard materials for the determination of the oil by infrared absorption method showed fairly different data when measured with both NDIR and IRSP (Table 1). It must be noticed that the oil content in waste water are different according to the choice of the standard materials.

収録刊行物

  • 分析化学

    分析化学 28 (12), T61-T65, 1979

    公益社団法人 日本分析化学会

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