{"title":"对含有有机污染物的生态水体进行高精度同位素比红外激光光谱分析的改进方法","authors":"Xinying Ling, Juske Horita","doi":"10.1002/rcm.10052","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <h3> Rationale</h3>\n \n <p>Applications of high-precision isotope analysis of ecohydrological water samples such as soil and plant waters with infrared (IR) laser spectrometry have been hampered by spectral interferences of volatile organic compounds.</p>\n </section>\n \n <section>\n \n <h3> Methods</h3>\n \n <p>In this study, three methods were tested to remove methanol (MeOH) and/or ethanol (EtOH) added to water for δ<sup>2</sup>H, δ<sup>18</sup>O, and <sup>17</sup>O-excess analysis with Picarro L2140-i: microcombustion module (MCM), pre-treatment with solid-phase extraction (SPE), and pre-treatment with simple MeOH/EtOH combustion (SMEC) method.</p>\n </section>\n \n <section>\n \n <h3> Results</h3>\n \n <p>The Picarro MCM was not able to combust the alcohols of high concentrations. Hydrophilic–lipophilic balanced (HLB) SPE could adsorb MeOH/EtOH at low concentrations (e.g., 0.1% EtOH). However, its adsorption capacity could be readily exhausted, and adsorbed water on the SPE adsorbents co-elutes and mix with a sample water. The SMEC can successfully combust highly concentrated waters (0.5% MeOH and 1% EtOH) at 450–500 °C, but the alcohol combustion and oxygen isotope exchange with added O<sub>2</sub> could significantly increase δ<sup>18</sup>O values (up to 6–7‰) and decrease <sup>17</sup>O-excess (up to 110 per meg) in the presence of a catalyst. The combination of post-analysis corrections of Picarro MCM data (δ<sup>2</sup>H and δ<sup>18</sup>O) and pre-treatment with SMEC method (δ<sup>2</sup>H and <sup>17</sup>O-excess) can reach the accuracy and precision of ≤3 and ≤2 ‰ (δ<sup>2</sup>H), ≤0.2 and ≤0.3‰ (δ<sup>18</sup>O), and ≤20 and ≤47 per meg (<sup>17</sup>O-excess), respectively.</p>\n </section>\n \n <section>\n \n <h3> Conclusions</h3>\n \n <p>A strategy of combining the two methods is proposed for high-precision isotope analysis of organic contaminated samples: post-analysis corrections of Picarro MCM data (δ<sup>2</sup>H and δ<sup>18</sup>O) and pre-treatment with SMEC method (δ<sup>2</sup>H and <sup>17</sup>O-excess). The improved methods in this study can provide sufficient accuracy and precision for isotope analysis of plant and soil waters, which can contribute to the fields of ecohydrology and agricultural sciences.</p>\n </section>\n </div>","PeriodicalId":225,"journal":{"name":"Rapid Communications in Mass Spectrometry","volume":"39 14","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Improved Methods for High Precision Isotope-Ratio Infrared Laser Spectroscopy of Ecohydrological Waters With Organic Contaminants\",\"authors\":\"Xinying Ling, Juske Horita\",\"doi\":\"10.1002/rcm.10052\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div>\\n \\n \\n <section>\\n \\n <h3> Rationale</h3>\\n \\n <p>Applications of high-precision isotope analysis of ecohydrological water samples such as soil and plant waters with infrared (IR) laser spectrometry have been hampered by spectral interferences of volatile organic compounds.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Methods</h3>\\n \\n <p>In this study, three methods were tested to remove methanol (MeOH) and/or ethanol (EtOH) added to water for δ<sup>2</sup>H, δ<sup>18</sup>O, and <sup>17</sup>O-excess analysis with Picarro L2140-i: microcombustion module (MCM), pre-treatment with solid-phase extraction (SPE), and pre-treatment with simple MeOH/EtOH combustion (SMEC) method.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Results</h3>\\n \\n <p>The Picarro MCM was not able to combust the alcohols of high concentrations. Hydrophilic–lipophilic balanced (HLB) SPE could adsorb MeOH/EtOH at low concentrations (e.g., 0.1% EtOH). However, its adsorption capacity could be readily exhausted, and adsorbed water on the SPE adsorbents co-elutes and mix with a sample water. The SMEC can successfully combust highly concentrated waters (0.5% MeOH and 1% EtOH) at 450–500 °C, but the alcohol combustion and oxygen isotope exchange with added O<sub>2</sub> could significantly increase δ<sup>18</sup>O values (up to 6–7‰) and decrease <sup>17</sup>O-excess (up to 110 per meg) in the presence of a catalyst. The combination of post-analysis corrections of Picarro MCM data (δ<sup>2</sup>H and δ<sup>18</sup>O) and pre-treatment with SMEC method (δ<sup>2</sup>H and <sup>17</sup>O-excess) can reach the accuracy and precision of ≤3 and ≤2 ‰ (δ<sup>2</sup>H), ≤0.2 and ≤0.3‰ (δ<sup>18</sup>O), and ≤20 and ≤47 per meg (<sup>17</sup>O-excess), respectively.</p>\\n </section>\\n \\n <section>\\n \\n <h3> Conclusions</h3>\\n \\n <p>A strategy of combining the two methods is proposed for high-precision isotope analysis of organic contaminated samples: post-analysis corrections of Picarro MCM data (δ<sup>2</sup>H and δ<sup>18</sup>O) and pre-treatment with SMEC method (δ<sup>2</sup>H and <sup>17</sup>O-excess). The improved methods in this study can provide sufficient accuracy and precision for isotope analysis of plant and soil waters, which can contribute to the fields of ecohydrology and agricultural sciences.</p>\\n </section>\\n </div>\",\"PeriodicalId\":225,\"journal\":{\"name\":\"Rapid Communications in Mass Spectrometry\",\"volume\":\"39 14\",\"pages\":\"\"},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2025-04-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"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.10052\",\"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.10052","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMICAL RESEARCH METHODS","Score":null,"Total":0}
Improved Methods for High Precision Isotope-Ratio Infrared Laser Spectroscopy of Ecohydrological Waters With Organic Contaminants
Rationale
Applications of high-precision isotope analysis of ecohydrological water samples such as soil and plant waters with infrared (IR) laser spectrometry have been hampered by spectral interferences of volatile organic compounds.
Methods
In this study, three methods were tested to remove methanol (MeOH) and/or ethanol (EtOH) added to water for δ2H, δ18O, and 17O-excess analysis with Picarro L2140-i: microcombustion module (MCM), pre-treatment with solid-phase extraction (SPE), and pre-treatment with simple MeOH/EtOH combustion (SMEC) method.
Results
The Picarro MCM was not able to combust the alcohols of high concentrations. Hydrophilic–lipophilic balanced (HLB) SPE could adsorb MeOH/EtOH at low concentrations (e.g., 0.1% EtOH). However, its adsorption capacity could be readily exhausted, and adsorbed water on the SPE adsorbents co-elutes and mix with a sample water. The SMEC can successfully combust highly concentrated waters (0.5% MeOH and 1% EtOH) at 450–500 °C, but the alcohol combustion and oxygen isotope exchange with added O2 could significantly increase δ18O values (up to 6–7‰) and decrease 17O-excess (up to 110 per meg) in the presence of a catalyst. The combination of post-analysis corrections of Picarro MCM data (δ2H and δ18O) and pre-treatment with SMEC method (δ2H and 17O-excess) can reach the accuracy and precision of ≤3 and ≤2 ‰ (δ2H), ≤0.2 and ≤0.3‰ (δ18O), and ≤20 and ≤47 per meg (17O-excess), respectively.
Conclusions
A strategy of combining the two methods is proposed for high-precision isotope analysis of organic contaminated samples: post-analysis corrections of Picarro MCM data (δ2H and δ18O) and pre-treatment with SMEC method (δ2H and 17O-excess). The improved methods in this study can provide sufficient accuracy and precision for isotope analysis of plant and soil waters, which can contribute to the fields of ecohydrology and agricultural sciences.
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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