回复v2795266发表于:2020/3/31 10:15:51悬赏金额:
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亚硝酸盐氮的标准曲线是怎么制定的?是以亚硝酸盐氮的含量为横坐标,吸光度为纵坐标定做标准曲线么?我做出来的标准曲线为y=0.0771x+0.0208,这个标准曲线行不?那根据这个标准曲线如何求水样的亚硝酸盐氮含量?是根据待测水样的吸光度,从曲线上查得亚硝酸盐氮含量么?
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我是按照实验步骤,取8支比色管,分别加入0.1ug/ml的亚硝酸盐氮标准溶液:0,0.50,1.00,2.50,5.00,7.50,10.00,12.50ml,用纯水稀释至50ml,然后加入1ml的对氨基苯磺酰胺,摇匀后2~8min,再加入1ml盐酸N-(1-奈基)-乙烯二胺溶液,摇匀后1h,测定吸光度,于540nm波长,1cm比色皿以水做参比。
我图片上传不了,我是以亚硝酸盐氮含量(ug):0,0.05,0.10,0.25,0.50,0.75,1.00,1.25为横坐标,
测出来的吸光度分别为:0.019,0.027,0.027,0.040,0.061,0.079,0.097,0.117为纵坐标,出来的标准曲线是y=0.0771x+0.0208,R2=0.9984,我待测水样测出来的吸光度为1.988,我想知道怎么算他的浓度?