【求助】做的标准曲线测定未知溶液的浓度，溶液浓度后面有*号，不知为什么？

dhd9f97

2011/05/10

私聊

紫外可见分光光度计（UV）

你好，我想问一下，我用自己做的标准曲线测定未知溶液的浓度，可是我发现有俩个溶液浓度后面有*号，不知为什么？我用的仪器是PerkinElmer Lambda 35紫外可见分光光度计。下面是我做的标准曲线和所测得的溶液浓度，请大家帮我看一下。多谢！

Wavelength(s) Sample ID Concentration Ord. value Comment
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263.8 0.0 ref.A01 0.0040 0.1335
263.8 0.0 conc1.A02 0.0060 0.1918
263.8 0.0 conc1.A03 0.0080 0.2368
263.8 0.0 conc1.A04 0.0100 0.2996
263.8 0.0 conc1.A05 0.0120 0.3526
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Equation: y = 2.449000e-02 + 2.729600e+01 * x

Residual error: 0.004242
Correlation coefficient: 0.999096

Date: 5/10/2011 Time: 9:58:11 AM
Instrument: PerkinElmer Lambda 35 Serial No: 101N5011207
Method: 20110420
Ordinate mode: Single wavelength
Slit: UV/VIS: 2.00 nm
Baseline: No correction ( 0.00 0.00 )
Result Filename: 1.RCO
Autozero performed:
Analyst:
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Wavelength(s) Sample ID Ordinate Factor Concentration Sample Info
____________________________________________________________________________________

263.8 0.0 1 0.6752 1.0000 0.0238*
263.8 0.0 2 0.3265 1.0000 0.0111
263.8 0.0 3 0.6911 1.0000 0.0244*
263.8 0.0 4 0.3138 1.0000 0.0106
263.8 0.0 5 0.1966 1.0000 0.0063
263.8 0.0 6 0.2370 1.0000 0.0078
263.8 0.0 7 0.2555 1.0000 0.0085
263.8 0.0 8 0.3093 1.0000 0.0104
263.8 0.0 9 0.1501 1.0000 0.0046
263.8 0.0 10 0.2015 1.0000 0.0065
263.8 0.0 11 0.1976 1.0000 0.0063
263.8 0.0 12 0.3127 1.0000 0.0106