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| 离子色谱法测定生物柴油中甲酸、乙酸、丙酸含量的研究 |
| Determination of contents of formic acid, acetic acid and propionic acid in biodiesel by ion chromatography |
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| DOI： |
| 中文关键词: 离子色谱法 生物柴油 甲酸 乙酸 丙酸 |
| 英文关键词:ion chromatography method biodiesel formic acid acetic acid propionic acid |
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| 中文摘要: |
| 研究了离子色谱法测定生物柴油中的甲酸、乙酸、丙酸含量。结果表明：采用离子色谱法检测甲酸、乙酸、丙酸含量时，其相关系数均在0.999以上，相关性较好；检出限分别为0.001、0.002 mg/L和0.003 mg/L，均小于0.02 mg/L，满足离子色谱检定规程对电导检测器最小可检测浓度的要求；色谱峰面积的相对标准偏差分别为1.0%、2.0%和1.5%，均小于3%，精密度高；加标回收率为87%~99%，说明油样前处理方法是有效的。地沟油生物柴油和小桐子生物柴油中甲酸含量分别为7.010、7.133 mg/kg，乙酸含量分别为8.955、1.390 mg/kg，丙酸含量分别为9.283、0 mg/kg，表明生物柴油中甲酸、乙酸、丙酸含量可受生物柴油种类的影响。采用超声波辅助管式反应器碱催化法和集热式恒温加热磁力搅拌器碱催化法制备的小桐子生物柴油中甲酸含量分别为7.153、5701 mg/kg，乙酸含量分别为1.500、0.752 mg/kg，丙酸含量分别为0.158、0 mg/kg，表明生物柴油中甲酸、乙酸、丙酸含量受其制备方法的影响。 |
| 英文摘要: |
| The determination of contents of formic acid, acetic acid and propionic acid by ion chromatography was studied. The results showed that the correlation coefficients of formic acid, acetic acid and propionic acid determined by ion chromatography were above 0.999 and the correlation was good. The detection limits were 0.001, 0.002 mg/L and 0.003 mg/L respectively, less than 0.02 mg/L, meeting the requirements of ion-chromatographic verification rules for the minimum detectable concentration of the conductance detector. The relative standard deviations of chromatographic peak area were 1.0%, 2.0% and 1.5% respectively, less than 3%, with high precision. The recovery rate of the standard was 87%-99%, indicating that the pre-treatment method of the oil sample was effective. The formic acid contents in swill-cooked dirty oil biodiesel and Jatropha curcas L. biodiesel were 7.010, 7133 mg/kg, acetic acid contents were 8.955, 1.390 mg/kg, and the propionic acid contents were 9283, 0 mg/kg, respectively. It indicated that the contents of formic acid, acetic acid and propionic acid in biodiesel were affected by the types of biodiesel. The formic acid contents in Jatropha curcas L. biodiesels produced by alkali catalytic method in tube reactor assisted by ultrasound and alkali catalytic method of magnetic stirrer with collector constant temperature heating were 7.153, 5.701 mg/kg, the acetic acid contents were 1.500, 0.752 mg/kg, and the propionic acid contents were 0.158, 0 mg/kg, respectively. It indicated that the contents of formic acid, acetic acid and propionic acid in biodiesel were affected by the preparation method. |
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