{"title":"MC-ICP-MS放射成因钕同位素分析中以145Nd/142为正态比质量偏差校正Ce限的测试","authors":"Torben Struve, Martin Zander, Katharina Pahnke","doi":"10.1002/rcm.9951","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Rationale</h3>\n \n <p>Neodymium isotopes are a powerful geochemical tool that has widely been used in terrestrial and extraterrestrial studies. Modern multicollector inductively coupled plasma mass spectrometers (MC-ICP-MS) allow fast, accurate, and precise analysis of the radiogenic Nd isotope ratio <sup>143</sup>Nd/<sup>144</sup>Nd. These analyses comprise relatively high instrumental mass bias that is typically corrected for using the stable <sup>146</sup>Nd/<sup>144</sup>Nd of 0.7219 and an exponential law. The instrument is usually tuned to optimize the operating conditions for isotope analysis, but this tuning is a trade-off primarily between signal intensity, stability, and accuracy. Alternative, more effective approaches for mass bias correction have been proposed that use <sup>145</sup>Nd/<sup>142</sup>Nd as normalizing ratio. However, one drawback of using this ratio is that the efficient removal of Ce from Nd is required to minimize the effect of isobaric interference of <sup>142</sup>Ce on <sup>142</sup>Nd.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>Here, we analyzed international Nd and rock reference materials using a Thermo Scientific Neptune <i>Plus</i> MC-ICP-MS to evaluate the sensitivity of <sup>145</sup>Nd/<sup>142</sup>Nd-based mass bias correction to varying Ce/Nd and in comparison with the commonly used <sup>146</sup>Nd/<sup>144</sup>Nd-based correction.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>Our results show that the corrected <sup>143</sup>Nd/<sup>144</sup>Nd of Ce-doped JNdi-1 and Ce-containing USGS BCR-2, NOD-A-1, and NOD-P-1 reference materials are insensitive to Ce/Nd of up to ~1.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>The correction of instrumental mass bias with <sup>145</sup>Nd/<sup>142</sup>Nd as a normalizing ratio yields, as previously suggested, improved trueness and precision of <sup>143</sup>Nd/<sup>144</sup>Nd data in comparison with <sup>146</sup>Nd/<sup>144</sup>Nd-based corrections, even under high Ce/Nd of ~1. This allows improved optimization of signal intensity during instrument tuning, which is particularly useful for natural samples with low Nd content. [Correction added on 10 December 2024, after first online publication: The Results and Conclusions in Abstract has been corrected in this version.]</p>\n </section>\n </div>","PeriodicalId":225,"journal":{"name":"Rapid Communications in Mass Spectrometry","volume":"39 3","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11623368/pdf/","citationCount":"0","resultStr":"{\"title\":\"Testing the Ce Limit of Mass Bias Correction Using 145Nd/142Nd as Normalizing Ratio in Radiogenic Neodymium Isotope Analysis by MC-ICP-MS\",\"authors\":\"Torben Struve, Martin Zander, Katharina Pahnke\",\"doi\":\"10.1002/rcm.9951\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Rationale</h3>\\n \\n <p>Neodymium isotopes are a powerful geochemical tool that has widely been used in terrestrial and extraterrestrial studies. Modern multicollector inductively coupled plasma mass spectrometers (MC-ICP-MS) allow fast, accurate, and precise analysis of the radiogenic Nd isotope ratio <sup>143</sup>Nd/<sup>144</sup>Nd. These analyses comprise relatively high instrumental mass bias that is typically corrected for using the stable <sup>146</sup>Nd/<sup>144</sup>Nd of 0.7219 and an exponential law. The instrument is usually tuned to optimize the operating conditions for isotope analysis, but this tuning is a trade-off primarily between signal intensity, stability, and accuracy. Alternative, more effective approaches for mass bias correction have been proposed that use <sup>145</sup>Nd/<sup>142</sup>Nd as normalizing ratio. However, one drawback of using this ratio is that the efficient removal of Ce from Nd is required to minimize the effect of isobaric interference of <sup>142</sup>Ce on <sup>142</sup>Nd.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>Here, we analyzed international Nd and rock reference materials using a Thermo Scientific Neptune <i>Plus</i> MC-ICP-MS to evaluate the sensitivity of <sup>145</sup>Nd/<sup>142</sup>Nd-based mass bias correction to varying Ce/Nd and in comparison with the commonly used <sup>146</sup>Nd/<sup>144</sup>Nd-based correction.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>Our results show that the corrected <sup>143</sup>Nd/<sup>144</sup>Nd of Ce-doped JNdi-1 and Ce-containing USGS BCR-2, NOD-A-1, and NOD-P-1 reference materials are insensitive to Ce/Nd of up to ~1.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Conclusions</h3>\\n \\n <p>The correction of instrumental mass bias with <sup>145</sup>Nd/<sup>142</sup>Nd as a normalizing ratio yields, as previously suggested, improved trueness and precision of <sup>143</sup>Nd/<sup>144</sup>Nd data in comparison with <sup>146</sup>Nd/<sup>144</sup>Nd-based corrections, even under high Ce/Nd of ~1. This allows improved optimization of signal intensity during instrument tuning, which is particularly useful for natural samples with low Nd content. [Correction added on 10 December 2024, after first online publication: The Results and Conclusions in Abstract has been corrected in this version.]</p>\\n </section>\\n </div>\",\"PeriodicalId\":225,\"journal\":{\"name\":\"Rapid Communications in Mass Spectrometry\",\"volume\":\"39 3\",\"pages\":\"\"},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2024-12-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11623368/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Rapid Communications in Mass Spectrometry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/rcm.9951\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"BIOCHEMICAL RESEARCH METHODS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rapid Communications in Mass Spectrometry","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/rcm.9951","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMICAL RESEARCH METHODS","Score":null,"Total":0}
引用次数: 0
摘要
原理：钕同位素是一种强大的地球化学工具，已广泛用于地球和地外研究。现代多收集器电感耦合等离子体质谱仪（MC-ICP-MS）允许快速，准确，精确的分析放射性Nd同位素比率143Nd/144Nd。这些分析包括相对较高的仪器质量偏差，通常使用稳定的146Nd/144Nd 0.7219和指数定律进行校正。仪器通常经过调整以优化同位素分析的操作条件，但这种调整主要是在信号强度、稳定性和准确性之间进行权衡。已经提出了一种更有效的质量偏差校正方法，即使用145Nd/142作为正态化比率。然而，使用该比率的一个缺点是，需要有效地从Nd中去除Ce，以尽量减少142Ce对142的等压干扰的影响。方法：使用Thermo Scientific Neptune Plus MC-ICP-MS分析国际上的Nd和岩石参考材料，评估145Nd/ 142nd质量偏差校正对Ce/Nd变化的灵敏度，并与常用的146Nd/ 144nd校正进行比较。结果：我们的研究结果表明，掺Ce的JNdi-1和含Ce的USGS BCR-2、NOD-A-1和NOD-P-1标准物质的校正143Nd/144Nd对Ce/Nd高达1不敏感。结论：与基于146Nd/144Nd的校正相比，用145Nd/ 144Nd作为正态化比率校正仪器质量偏差，如前所述，即使在Ce/Nd高至~1的情况下，也能提高143Nd/144Nd数据的准确性和精度。这允许在仪器调谐期间改进信号强度优化，这对于低Nd含量的天然样品特别有用。
Testing the Ce Limit of Mass Bias Correction Using 145Nd/142Nd as Normalizing Ratio in Radiogenic Neodymium Isotope Analysis by MC-ICP-MS
Rationale
Neodymium isotopes are a powerful geochemical tool that has widely been used in terrestrial and extraterrestrial studies. Modern multicollector inductively coupled plasma mass spectrometers (MC-ICP-MS) allow fast, accurate, and precise analysis of the radiogenic Nd isotope ratio 143Nd/144Nd. These analyses comprise relatively high instrumental mass bias that is typically corrected for using the stable 146Nd/144Nd of 0.7219 and an exponential law. The instrument is usually tuned to optimize the operating conditions for isotope analysis, but this tuning is a trade-off primarily between signal intensity, stability, and accuracy. Alternative, more effective approaches for mass bias correction have been proposed that use 145Nd/142Nd as normalizing ratio. However, one drawback of using this ratio is that the efficient removal of Ce from Nd is required to minimize the effect of isobaric interference of 142Ce on 142Nd.
Methods
Here, we analyzed international Nd and rock reference materials using a Thermo Scientific Neptune Plus MC-ICP-MS to evaluate the sensitivity of 145Nd/142Nd-based mass bias correction to varying Ce/Nd and in comparison with the commonly used 146Nd/144Nd-based correction.
Results
Our results show that the corrected 143Nd/144Nd of Ce-doped JNdi-1 and Ce-containing USGS BCR-2, NOD-A-1, and NOD-P-1 reference materials are insensitive to Ce/Nd of up to ~1.
Conclusions
The correction of instrumental mass bias with 145Nd/142Nd as a normalizing ratio yields, as previously suggested, improved trueness and precision of 143Nd/144Nd data in comparison with 146Nd/144Nd-based corrections, even under high Ce/Nd of ~1. This allows improved optimization of signal intensity during instrument tuning, which is particularly useful for natural samples with low Nd content. [Correction added on 10 December 2024, after first online publication: The Results and Conclusions in Abstract has been corrected in this version.]
期刊介绍：
Rapid Communications in Mass Spectrometry is a journal whose aim is the rapid publication of original research results and ideas on all aspects of the science of gas-phase ions; it covers all the associated scientific disciplines. There is no formal limit on paper length ("rapid" is not synonymous with "brief"), but papers should be of a length that is commensurate with the importance and complexity of the results being reported. Contributions may be theoretical or practical in nature; they may deal with methods, techniques and applications, or with the interpretation of results; they may cover any area in science that depends directly on measurements made upon gaseous ions or that is associated with such measurements.
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