排水中の微量油分の溶媒抽出-外線分析法による定量

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The determination of trace amounts of dispersed oil of aliphatic hydrocarbons (0.01 to 8.5 ppm) in waste water has been studied. This method is based on the extraction of oil in waste water into carbon tetrachloride, followed by measurement of infrared absorption at 3.4 to 3.5μ. The following results were obtained. (1) More than 90% of oil was recovered by the extraction if 1 to 10% of sodium chloride was added as a salting out reagent. (2) The extractability of oil was affected by volume ratio of water and the organic solvent. At the volume ratio of 1 : 1, more than 90% of oil was able to be extracted, whereas the extractability decreased with increase of the volume ratio. (3) In the presence of cationic or anionic surfactants, the extractability of oil was not affected, but in the presence of nonionic surfactants or both of cationic and anionic surfactants, the determination of oil was interfered in positive error. (4) The method was applied to the analysis of test waste waters containing 0.01 to 8.5 ppm of dispersed “A” heavy oil. The results were compared with that of the gravimetric method using extraction with low boling point solvent which had been proposed previously, and recoveries more than 90% were obtained in both methods. (5) The volatilization loss of “A” heavy oil was 23% in the n-hexane extraction method (JIS K 0102).
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