色谱定量分析中,校正因子的作用? 色谱定量分析与绝大部分的仪器定量分析一样,是一种相对定量方法,是根据仪器检测器的响应值与被测组分的量,在某些条件限定下成正比关系来进行定量分析的。也就是说,在色谱分析中,在某些条件限定下,色谱峰的峰高或峰面积(检测器的响应值)与所测组分的数量(或浓度)成正比,色谱分析的基本公式为: w i ( c i )= f i a i ( h i ) 其中, w i 为组分 i 的质量, c i 为组分 i 的浓度; a i 为组分 i 的峰面积, h i 为组分 i 的峰面高,即仪器对组分 i 的响应值; f i 为组分 i 的校正因子,即检测器的响应值与所测组分的数量(或浓度)的比例因子,它与检测器的性质和被测组分的性质有关。 在色谱定量分析中,要想得到可靠的定量分析结果,必须能准确测定检测器的响应值——峰面积或峰高和校正因子。关于如何准确测定检测器的响应值和校正因子,建议你去看看 色谱技术丛书 的 《色谱定性与定量》之第三章。这套丛书在本论坛就有,见 https:///viewthread.php?tid=128693&highlight=%c9%ab%c6%d7%bc%bc%ca%f5%b4%d4%ca%e9 。查看更多
工程师考级的英语是什么水平,很难吗? 【分享】伊索寓言:运神像的驴子 the ass carrying the image an ass once carried through the streets of a city a famous wooden image, to be placed in one of its temples. as he passed along, the crowd made lowly prostration before the image. the ass, thinking that they bowed their heads in token of respect for himself, bristled up with pride, gave himself airs, and refused to move another step. the driver, seeing him thus stop, laid his whip lustily about his shoulders and said, "o you perverse dull-head! it is not yet come to this, that men pay worship to an ass." they are not wise who give to themselves the credit due to others. they are not wise who give to themselves the credit due to others. 运神像的驴子 有个人把神像放在驴子背上,赶着进城去。凡是遇见他们的人都对着神像顶礼膜拜。驴子以为人们是向它致敬,便洋洋得意,大喊大叫,再也不肯往前走了。驴夫见到这情形,明白了是甚么回事,立刻狠狠地给他一棍,并骂道:「喂,这蠢东西,人们给驴子鞠躬的时候还早得很哩!」 这个故事带出的启示就是:那些依靠别人获得尊敬的人太不自量了。 查看更多