- 1、本文档共34页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
* * RF Power Increasing Rf power dissociates oxide ions more efficiently MO+ oxide levels drop M+ analyte signal increases Increasing the Rf power leads to increases of doubly charged ions M+ M++ Increasing power first increases, then decreases singly charged analyte ion intensity MO+ M+ M++ * Nebulizer Argon Flow Increasing the flow first increases then decreases M+ Increased nebulizer flow reduces the plasma temperature Decreases M++ Increases MO+ * ICP Parameter Interaction RF power, nebulizer argon flow and sampling position interact extensively At every preset RF power, one can achieve “optimum” analytical conditions which are unique for the selected power Best compromise for sensitivity, noise, oxide, and doubly charged ion levels is typically only achieved within a small RF power range Do not changed Plasma RF power on a daily basis, unless necessary. Typical RF power for normal sample types should be within 1000 W to 1300W Higher power levels only are required for the analysis of organic solvents (1400 W to 1500 W) * * * 98 * * * * * * * * * * Spectra to show that As+ is being converted to AsO+. All peaks in red were acquired in standard mode; all peaks in blue were acquired in DRC mode (O2=0.45 mL/min). In standard mode, notice the large peak at 75As+ and lack of peak at m/z 91. When O2 is turned on, the peak at m/z 75 disappears, while a peak at m/z 91 appears. This provides further evidence the As+ is converted to AsO+. * * * * 雾化气流量对离子强度的影响 Increasing Nebulizer Argon Flow Intensity ICP参数之间对离子强度的影响 Increasing Nebulizer Argon Flow Intensity 900W 1000 W 1100W 1200W 质谱干扰的消除(2)——选择同位素、干扰校正方程 尽量避免或者降低同质异位素干扰 比如: Ca43 Fe57 使用干扰校正方程: …… Spectral Interference - Isobaric Corrections Predictable Cl- Molecular Species Molecular Ion Abund. (%) Interfered Isotope Abund. (%) 38 Cl 18 O 0.05 55 Mn 100 37 Cl 16 O 1 H 24.4 54 Fe 37 Cl 17 O 1 H 0.01 55 Mn 35 Cl 40 Ar 75.2 75 As 100 35 Cl 38 Ar 0.05 73 Ge 7.76 35 Cl 36
文档评论(0)