国标法检测食品中邻苯二甲酸酯空白值的分析探讨

Discussions on the blank value in the determination of phthalate acid esters in foods

目的了解国标方法检测食品中邻苯二甲酸酯类化合物的空白值并探讨其影响因素。方法应用国标方法考察了溶剂及溶剂在GPC系统中储留时间等因素对空白值的影响。结果按国标方法,常规操作状态下做系统空白分析,未检测到DMEP、BMPP、DEEP、DPP、DHXP、BBP、DBEP、DCHP、DPhP、DNOP、DNP、DINP;检测到DMP、DEP、DIBP、DBP、DEHP,空白值均小于10μg/L。结论溶剂和溶剂在GPC系统中的储留时间是影响空白值的主要因素,据此提出了降低空白值的建议。

Objective Aiming at understanding the probable problem of high blank value in the determination of phthalate acid esters in foods. Methods The influencial factors such as organic solvent, the immersed time of GPC system were analyzed carefully by GB/T 21911--2008. Results DMEP, BMPP, DEEP, DPP, DHXP, BBP, DBEP, DCHP, DPhP, DNOP, DNP, DINP were not detected, whereas DMP, DEP, DIBP, DBP, DEHP were detected, the blank values were lower than 10 microg/L, respectively. Conclusion The main factors influencing the blank value were observed, therefore, measures on reducing the blank value were proposed.