title: Accurate determination of residual acrylic acid in superabsorbent polymer of hygiene products by headspace gas chromatography.
abstract: This work reports on a method for the determination of residual acrylic acid (AA) in the superabsorbent polymers for hygiene products by headspace analysis. It was based on water extraction for the polymer sample at a room temperature for 50min. Then, the AA in the extractant reacted with bicarbonate solution in a closed headspace sample vial, from which the carbon dioxide generated from the reaction (within 20min at 70°C) was detected by gas chromatography (GC). It was found that there is adsorption partition equilibrium of AA between solid-liquid phases. Therefore, an equation for calculating the total AA content in the original polymers sample was derived based on the above phase equilibrium. The results show that the HS-GC method has good precision (RSD<2.51%) and good accuracy (recoveries from 93 to 105%); the limit of quantification (LOQ) was 373mg/kg. The present method is rapid, accurate, and suitable for determining total residual acrylic acid in a wide variety of applications from processing of superabsorbent polymer to commercial products quality control.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
authors.forename: Shu-Xin
authors.initials: SX
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; National Paper Products Quality Supervision Inspection Center, Dongguan 523080, China. Electronic address: xschai@scut.edu.cn.
authors.forename: Xin-Sheng
authors.initials: XS
authors.lastname: Chai
authors.affiliation: Pearl River Water Resources Institute, Pearl River Water Resources Commission, Guangzhou 510640, China.
authors.forename: Ran
authors.initials: R
authors.lastname: Jiang
mesh_terms: D065966:Absorption, Physicochemical; D000179:Acrylates / Q000032:analysis*; D000180:Acrylic Resins / Q000737:chemistry*; D002245:Carbon Dioxide / Q000032:analysis; D002849:Chromatography, Gas / Q000379:methods; D006920:Hygiene
chemical_list: D000179:Acrylates; D000180:Acrylic Resins; D002245:Carbon Dioxide; C006903:carbopol 940; C036658:acrylic acid
keywords: Acrylic acid; Headspace gas chromatography; Hygiene products; Superabsorbent polymer