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Highly sensitive determination of dissolved ultra-trace phosphorus by ICP-MS with methane mixed plasma
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-12-18 , DOI: 10.1039/d0ja00462f Ying Zhang 1, 2, 3, 4 , Jianguo Qu 1, 2, 3, 4 , Yan Chang 1, 2, 3, 4 , Yue Li 1, 2, 3, 4
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-12-18 , DOI: 10.1039/d0ja00462f Ying Zhang 1, 2, 3, 4 , Jianguo Qu 1, 2, 3, 4 , Yan Chang 1, 2, 3, 4 , Yue Li 1, 2, 3, 4
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Phosphorus concentrations in water are usually determined using phosphomolybdenum blue (PMB) spectrophotometry. However, the measurement of extremely low phosphorus concentrations by this method is limited for various reasons. This work systematically developed a highly sensitive analytical method for the measurement of dissolved ultra-trace phosphorus by inductively coupled plasma mass spectrometry with methane mixed plasma (CH4-ICP-MS). We determined the optimal radio frequency (RF) power and verified the sensitizing effect of carbon-containing plasma, showing that the addition of 6.0 mL min−1 methane can significantly improve the sensitivity of phosphorus detection. There was no mass spectral interference in the determination of phosphorus in medium resolution mode. The species of phosphorus, dissolved organic carbon (DOC) concentrations ≤15.0 mg L−1, and salinity ≤3.4 had no effect on the determination of phosphorus. DOC concentrations >15.0 mg L−1 had some inhibitory effect on the determination, but microwave digestion eliminated the effect of organic matter with good reproducibility. Salinity levels >3.4 have an inhibitory effect on the determination and the samples need to be diluted or desalinated for accurate determination. The limit of detection (LOD) for the determination of phosphorus by CH4-ICP-MS is 7.3 ng L−1. The accuracy and precision of this method are 2.5% and 1.3%, respectively. The determination precision values for phosphorus in drinking water and in natural samples such as Arctic glacier meltwater, lake water, river water, seawater and rain water were all within 3.5%, and the spike recovery rates were 101.2–103.8%. The method developed here thus has a low LOD and high accuracy. Using the proposed method, ultra-trace phosphorus in low-phosphorus samples such as polar water can be directly measured, which simplifies the sample pretreatment process, and the sample is not easily contaminated by reagents.
中文翻译：
甲烷混合等离子体ICP-MS高灵敏测定溶解态超痕量磷
通常使用磷钼蓝（PMB）分光光度法测定水中的磷浓度。但是，由于各种原因，限制了用这种方法测量极低的磷浓度。这项工作系统地开发了一种高灵敏度的分析方法，用于通过甲烷-混合等离子体（CH 4 -ICP-MS）电感耦合等离子体质谱法测定溶解的超痕量磷。我们确定了最佳射频（RF）功率，并验证了含碳等离子体的敏化效果，表明添加6.0 mL min -1甲烷可以显着提高磷检测的灵敏度。在中等分辨率模式下测定磷时，没有质谱干扰。磷的种类，溶解有机碳（DOC）浓度≤15.0mg L -1和盐度≤3.4对磷的测定没有影响。DOC浓度> 15.0 mg L -1对测定具有一定的抑制作用，但是微波消解以良好的重现性消除了有机物的影响。盐度水平> 3.4会对测定产生抑制作用，需要稀释或淡化样品才能进行准确测定。CH 4 -ICP-MS测定磷的检出限（LOD）为7.3 ng L -1。该方法的准确度和精密度分别为2.5％和1.3％。饮用水和北极冰川融水，湖水，河水，海水和雨水等自然样品中磷的测定精度值均在3.5％以内，加标回收率为101.2–103.8％。因此，此处开发的方法具有低LOD和高精度。使用所提出的方法，可以直接测量低磷样品（如极性水）中的痕量磷，这简化了样品的预处理过程，并且样品不易被试剂污染。
更新日期：2021-01-12
中文翻译：
甲烷混合等离子体ICP-MS高灵敏测定溶解态超痕量磷
通常使用磷钼蓝（PMB）分光光度法测定水中的磷浓度。但是，由于各种原因，限制了用这种方法测量极低的磷浓度。这项工作系统地开发了一种高灵敏度的分析方法，用于通过甲烷-混合等离子体（CH 4 -ICP-MS）电感耦合等离子体质谱法测定溶解的超痕量磷。我们确定了最佳射频（RF）功率，并验证了含碳等离子体的敏化效果，表明添加6.0 mL min -1甲烷可以显着提高磷检测的灵敏度。在中等分辨率模式下测定磷时，没有质谱干扰。磷的种类，溶解有机碳（DOC）浓度≤15.0mg L -1和盐度≤3.4对磷的测定没有影响。DOC浓度> 15.0 mg L -1对测定具有一定的抑制作用，但是微波消解以良好的重现性消除了有机物的影响。盐度水平> 3.4会对测定产生抑制作用，需要稀释或淡化样品才能进行准确测定。CH 4 -ICP-MS测定磷的检出限（LOD）为7.3 ng L -1。该方法的准确度和精密度分别为2.5％和1.3％。饮用水和北极冰川融水，湖水，河水，海水和雨水等自然样品中磷的测定精度值均在3.5％以内，加标回收率为101.2–103.8％。因此，此处开发的方法具有低LOD和高精度。使用所提出的方法，可以直接测量低磷样品（如极性水）中的痕量磷，这简化了样品的预处理过程，并且样品不易被试剂污染。
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