《检测极限计算》PPT课件.ppt
Detection limit 配制一定浓度的稀溶液,测试其PL光谱,不同时间下连续扫描35次,计算最大强度Emax和最 小强度Emin之间的差值 E,然后往里逐渐加待测离子,直到PL强度E与原来的强度Emin差达到 E的3倍,此时的浓度就为检测极限。配制一定浓度的稀溶液,测试其PL光谱,逐渐往里滴加微量待测离子,直到能够观察到光谱的变化,此时的浓度就是检测极限。配制一定浓度的稀溶液,测试其滴定图,用测得的最小强度减去各浓度下的强度与最小强度与最大强度之差的比值为纵坐标,待测离子浓度为横坐标作图,并线性拟合,直线与横坐标的交点就是检测极限。配制一定浓度的稀溶液,测试其滴定图,选择线性关系较好的浓度范围,以强度为纵坐标,浓度为横坐标作图,并线性拟合,得到线性方程Y=BX+A。计算空白(或某一浓度)的标准偏差S,三倍标准偏差与直线斜率比值就是检测极限。其中:为所有强度的平均值 为任一浓度下的强度值 N为测试次数Anal.Chem.1996,68,1414 1418 The intensity data were normalized between the minimum intensity(zero free calcium)and the maximum intensity(39.8M free calcium)and are shown in Figure 4.A linear regression curve was fitted to the five intermediate values(38 nM-11.35 M free calcium)of Figure 4.The point at which this line crossed the ordinate axis was taken as the detection limit and equaled approximately 25 nM free calcium.Anal.Chem.1996,68,1414 1418 10=25*10-9=25 nM Tetrahedron Letters 50(2009)42934296Tetrahedron Letters 50(2009)42934296Supplementary Material The optodes allow determination of Hg(II)in the working range of 1.01091.0105M with a detection limit of 4.3 ppb.The association constant of the 1:1 complex formation for Hg(II)was found to be Ka=1.86105 M1 配制一定浓度的稀溶液,测试其PL光谱,不同时间下连续扫描35次,计算最大强度Emax和最 小强度Emin之间的差值 E,然后往里逐渐加待测离子,直到PL强度E与原来的强度Emin差达到 E的3倍,此时的浓度就为检测极限。配制一定浓度的稀溶液,测试其PL光谱,逐渐往里滴加微量待测离子,直到能够观察到光谱的变化,此时的浓度就是检测极限。配制一定浓度的稀溶液,测试其滴定图,用测得的最小强度减去各浓度下的强度与最小强度与最大强度之差的比值为纵坐标,待测离子浓度为横坐标作图,并线性拟合,直线与横坐标的交点就是检测极限。配制一定浓度的稀溶液,测试其滴定图,除去最小值和最大值,以强度为纵坐标,浓度为横坐标作图,并线性拟合,得到线性方程Y=BX+A。计算空白的标准偏差S,三倍标准偏差与直线斜率比值就是检测极限。其中:为所有强度的平均值 为任一浓度下的强度值 N为测试次数low detection limit(0.1M)ANALYTICAL SCIENCES OCTOBER 2010,VOL.26 ANALYTICAL SCIENCES OCTOBER 2010,VOL.26 Electronic Supplementary InformationAnalytica Chimica Acta 631(2009)9195Supporting InformationAnalytica Chimica Acta 631(2009)9195detection limit=3*1/70.01=0.043*10-7