回复Insm_83c95970发表于:2020/8/10 15:57:27悬赏金额:
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朋友们,最近分析镁有些问题,国标GBZ/T 300.16-2017镁及其化合物,完全据国标条件分析,[img=,690,75]https://ng1.17img.cn/bbsfiles/images/2020/08/202008101554241005_7636_3915726_3.png!w690x75.jpg[/img]
[img=,690,104]https://ng1.17img.cn/bbsfiles/images/2020/08/202008101554453000_21_3915726_3.png!w690x104.jpg[/img]
只是基改,工程师建议是硝酸镧(定容后浓度为0.2%w/v),狭缝0.7和0.2结果差不多,做出来的曲线向纵轴弯曲,非线性通过原点系数0.9999,线性计算截距系数0.9。请问,这是咋回事?上网查询了镁都是用的最小二乘法。
[img=,690,501]https://ng1.17img.cn/bbsfiles/images/2020/08/202008101552171476_8259_3915726_3.png!w690x501.jpg[/img][img=,690,507]https://ng1.17img.cn/bbsfiles/images/2020/08/202008101552161536_1715_3915726_3.png!w690x507.jpg[/img]