鱼肉粉中二噁英及二噁英类多氯联苯成分分析标准物质的研制

目的 研制鱼肉粉基体中二噁英及二噁英类多氯联苯成分分析标准物质.方法 以草鱼为原料,采用污染物含量较高的飞灰样品配合饲料喂养,经去骨去皮,匀浆干燥、研磨筛分等过程后制得候选标准物质,经均匀性和稳定性评价,由8家实验室定值,分析评估其不确定度.结果 经检验基体标准物质均匀性良好,能长期稳定保存至少12个月,PCDD/Fs...

Development and certification of a reference material for PCDD/Fs and DL-PCBs in fish powder

Objective To prepare reference materials of dioxins and dioxin-like polychlorinated biphenyls in fish powder matrix. Methods Using fly ash to feed grass carp, the fish samples were peeled, homogenized, dried, packed and sterilized. After homogeneity and stability studies, coordinated values were determined by 8 laboratories, and the uncertainty was evaluated. Results The reference material had good uniformity and the stability was more than 12 months. The characteristic values of PCDD/Fs were 0.017-1.4 pg/g, the expanded uncertainty were 0.02-0.6 pg/g and the characteristic values of DL-PCBs were 0.54-16 pg/g, expanded uncertainty were 0.28-6 pg/g. The matrix reference material was approved by the evaluation committee(GBW(E)100741). Conclusion The matrix reference material has good homogeneity and stability, which can be used in the quality control for analyzing, laboratory ability verification, analytical instrument calibration, analysis method accuracy evaluation and verification, etc.