Determination of Fluorine in Food-Contact Paper by Ion-Selective Electrode Method
To strengthen the regulation of compliance concerning perfluoroalkyl and polyfluoroalkyl substances(PFAS)in domestic paper packaging industry,a determination method for total fluorine,inorganic fluorine,and extractable organic fluorine content in food contact paper was established by utilizing various sample pretreatment techniques in conjunction with ion-selective electrode(ISE).Subsequently,the established methods were applied to screen paper samples collected from the market.Three fluorine determination methods exhibited good linear correlations.The limit of detection(LOD)and limit of quantitation(LOQ)for total fluorine were 2.50 mg/kg and 6.25 mg/kg,respectively.For inorganic fluorine,the LOD and LOQ were 0.30 mg/kg and 0.75 mg/kg,respectively.For extractable organic fluorine,the LOD and LOQ were 0.50 mg/kg and 2.00 mg/kg,respectively.The recoveries for all methods ranged from 80％to 120％,with precision values below 10％(n=6).Screening results revealed that total fluorine content in 48 food contact paper samples varied from(9.44±0.12)to(533.77±18.20)mg/kg,with a non-compliance rate of 29.2％,compared to the EU limited requirements.More than half of the paper samples did not comply with the Danish regulations for total organic fluorine content limits.
万方数据
维普
