Determination of the softening point of rosin by a simple and automated headspace gas chromatographic technique

Abstract

We report a simple and automated headspace gas chromatographic technique for the determination of the softening point of rosin. A lumpy solid of rosin is added into a headspace vial, then an automated stepwise temperature ramping and headspace sampling was performed at each temperature stage and gas chromatography measurement. By plotting the gas chromatography signal for an impurity in rosin versus the temperature, a transition point (corresponding to the rosin softening point) was determined. The results show that the present method has a good precision (<0.76%), and good accuracy (the relative differences compared to the ring and ball method was <4.0%). The present method is simple, accurate, and automated. It is practical and suitable for testing the softening of rosin and derivatives in mills.

Determination of carbonate content in barite ore by headspace gas chromatography

“…In contrast to traditional methods, headspace GC (HS‐GC) is an effective technique for the analysis of volatiles in complex matrices. Several HS‐GC methods have been developed to quantify analyte contents, such as dissolved inorganic carbon in environmental water [10], anhydride groups in anhydride‐based epoxy hardeners [11], softening point of rosin [12], and hydrogen peroxide in pulp bleaching effluents [13]. A pressure‐affected method for determining the CaCO 3 content of paper materials has been proposed [14].…”