Determination of the oil absorption value of inorganic powder by tracer-assisted headspace gas chromatography

• Published in: Journal of Chromatography A Vol. 1721; p. 464823
• Main Authors: Dai, Yi, Li, Huan, Zhu, Hongyue, Yu, Kang, He, Qiyu, Zhang, Tinghui, Luo, Yingchun, Xie, Jiao
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 26-04-2024
• Subjects: Chromatography, Gas - methods; Headspace analysis; Inorganic powder; Oil absorption value; Powders; Temperature; Toluene - analysis; Inorganic powder; GC; Headspace analysis; Oil absorption value
• ISSN: 0021-9673; 1873-3778
• DOI: 10.1016/j.chroma.2024.464823

•Determination of oil absorption value of inorganic powder by tracer-based HS-GC.•A mathematical model proves the relationship between tracer and oil absorption value.•The present method is simple, efficient, and can be used for batch sample testing.
This paper reports a method for determining the oil absorption value of inorganic powder based on tracer-assisted headspace gas chromatographic (HS-GC) technique. The method was carried out by adding 25 μL droplet of toluene-Dioctyl Phthalate solution onto the surface of 1.0 g inorganic powder, then sealing the headspace vial and shaking it to make the powder spherical. The amount of toluene that not been adsorbed by inorganic powder was quantified using HS-GC with the optimal equilibrium temperature and time conditions of 100 °C and 7 min, respectively. A new mathematical model shows that the oil absorption value can be determined from the signal of toluene. The results show that the employed method has good precision (the relative standard deviation < 3.6 %) and accuracy (R2 = 0.993). This method is simple and accurate, and can be an reliable tool for testing the oil absorption value of inorganic powder sample.