Plasma processes to detect fluorine with ICPMS/MS as [M–F]+: an argument for building a negative mode ICPMS/MS†,Journal of Analytical Atomic Spectrometry

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Plasma processes to detect fluorine with ICPMS/MS as [M–F]+: an argument for building a negative mode ICPMS/MS†
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2018-05-16 00:00:00 , DOI: 10.1039/c8ja00050f
Nor Laili Azua Jamari _{1,

2,

3,

4,

5} , Arne Behrens _{1,

2,

3,

4,

5} , Andrea Raab _{1,

2,

3,

4,

5} , Eva M. Krupp _{1,

2,

3,

4,

5} , Jörg Feldmann _{1,

2,

3,

4,

5}

Affiliation

Detection of fluorine with commercial ICPMS is impossible due to the high ionisation potential (IP) of fluorine. A novel approach through the formation of fluorine-containing polyatomic ions [M–F]⁺ in the plasma allows the successful detection of F at sub ppm levels by ICPMS/MS. Two theories behind [M–F]⁺ formation have been proposed, yet there is no clear understanding about the mechanism. Here, different metal solutions were tested for the characterisation of plasma processes in the formation of [M–F]⁺. Three characteristics: high [M–F]⁺ bond dissociation energy (BDE), low [M–O]⁺ BDE and low IP were found to be essential to get the highest sensitivity for [M–F]⁺. It was found that for elements with a higher [M–F]⁺ BDE than [M–O]⁺ BDE, the sensitivity decreases linearly with the second IP of the element, meaning that the major process in the plasma is the harvesting of F⁻ by M²⁺ to form [M–F]⁺. Barium exhibited the highest sensitivity for [M–F]⁺. However, the robustness of this approach was questioned due to matrix effects, hence an argument for re-developing negative ion ICPMS/MS was discussed in which detection limits in the sub-ppb range could be reached.

中文翻译：

用ICPMS / MS作为[MF] ^+进行等离子体检测氟的过程：建立负模式ICPMS / MS的论点†

由于氟的高电离电势（IP），因此无法使用商用ICPMS检测氟。通过在血浆中形成含氟多原子离子[MF] ^{+的新方法}，可以通过ICPMS / MS成功检测亚ppm级的F。已经提出了[MF] ⁺形成背后的两种理论，但对该机理尚无明确的了解。在这里，对不同的金属溶液进行了测试，以表征[MF] ⁺形成过程中的等离子体过程。三个特征：高[MF] ⁺键解离能（BDE），低[M] ⁺ BDE和低IP是获得[MF] ⁺最高灵敏度的必要条件。发现[M–F] ⁺ BDE高于[M–O] ⁺ BDE的元素，其灵敏度随元素的第二IP线性降低，这意味着血浆中的主要过程是F的收获⁻由M ²⁺形成[MF] ⁺。钡对[MF] ^+的敏感性最高。但是，由于基质效应，该方法的鲁棒性受到质疑，因此讨论了重新开发负离子ICPMS / MS的论点，其中可以达到亚ppb范围的检测限。

更新日期：2018-05-16

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