我们今天做矿泉水中锌的测定 为啥标线差得离谱 0.7 0.1甚至 而且浓度高的标液还是负值的都有[img=,690,516]https://ng1.17img.cn/bbsfiles/images/2019/11/201911271744098151_149_3490514_3.png[/img][img=,690,517]https://ng1.17img.cn/bbsfiles/images/2019/11/201911271744182912_287_3490514_3.png[/img][img=,690,920]https://ng1.17img.cn/bbsfiles/images/2019/11/201911271744315452_9889_3490514_3.png[/img][img=,690,920]https://ng1.17img.cn/bbsfiles/images/2019/11/201911271744411112_6631_3490514_3.png[/img]