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原文由 weifengtwo 发表:• 为何谱库检索结果不只一次报告同一化合物？
7月25号 新问题
•Why does the library search results report the same compound more than once?
解答
The NIST, WILEY, and other libraries were not produced by Agilent. They contain spectra produced using magnetic field type equipment and by MS from various different manufacturers. As the library may contain a number of different measurements for the same compound, the compound may be displayed more than once in the results.
In the extended data analysis screen, open the [Spectra] menu and click [Edit Search Strategy] to open the [Search Strategy] dialog box. Selecting the [Delete duplications and CAS number] checkbox will prevent the same compound from appearing more than once.
原文由 jhzhang33 发表:原文由 weifengtwo 发表:• 为何谱库检索结果不只一次报告同一化合物？
7月25号 新问题
• 新问题Why does the library search results report the same compound more than once?
解答
The NIST, WILEY, and other libraries were not produced by Agilent. They contain spectra produced using magnetic field type equipment and by MS from various different manufacturers. As the library may contain a number of different measurements for the same compound, the compound may be displayed more than once in the results.
In the extended data analysis screen, open the [Spectra] menu and click [Edit Search Strategy] to open the [Search Strategy] dialog box. Selecting the [Delete duplications and CAS number] checkbox will prevent the same compound from appearing more than once.
解答.WILEY,以及其它谱库不是由Agilent创建的。他们包含由磁质谱和不同厂家MS产生的谱图。因为谱库包含同一化合物的多次扫描结果，化合物可能在结果中多次显示。在扩展的数据分析页面，打开[光谱]菜单并点击[编辑搜索策略]以打开[搜索策略]对话框。选择[删除重复的CAS 号]检验栏即可解决同一化合物出现多次的问题。
原文由 weifengtwo 发表:新问题之二：更换色谱柱后做SIM扫描无可确定的峰？解答：SIM扫描通常用于分组分析和改变各时间段的扫描离子。柱子改变通常导致峰保留时间的改变。如果某一特定化合物峰的保留时间改变了，因为该化合物的特征离子在该时间段未设置，这将导致该化合物峰不出现。在这种情况下，应再进行一次全扫描，以重置SIM的扫描特征离子以进行SIM检测。你也可通过同时进行SIM/Scan 来获得这些数据。
新问题之二：After replacing column for SIM analysis why are no peaks identified? 更换柱子之后，SIM模式下扫描检测不到任何组分？
解答：SIM analysis typically performs grouping and changes the ions captured in each time band. Changing the column usually causes the peak retention times to change. If the retention time for a particular compound's peak changes the peak will not appear if the ions required to capture that compound's peak are not set. In this situation, perform another scan measurement, reconfigure the SIM data acquisition conditions based on this data, and then perform the SIM measurement. You can also obtain the data by performing synchronous SIM/Scan data acquisition.
原文由 rongspy 发表:
应该多长时间进行一次調諧？
調諧的频率取决于分析样品的数量、特性、濃度范围。 但沒有確切的統一的標准。
在一天裡沒必要對質譜做兩次調諧，解決的辦法之一是结合自動調諧和快速調諧。
对于待機的機器来说，有必要做一份每二天調諧并且检查状态并且每周执行一次自動調諧的时刻表並凭此将保持機器在最佳状态。
不过，自動調諧必须在下列狀況下执行：
1.換柱子，質譜的維護，或者系统关機之后。
2.新的方法改編了离子源、傳輸線温度以及柱流量。
3.如果沒有通過靈敏度測試。
如果上面沒有提及，建议这被在定量分析之前执行調諧。 並保持炉度，离子源温度，傳輸線温度和柱子流量不變。
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