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| Determination of 23 Elements in Diluted Asphalt by Inductively Coupled Plasma Mass Spectrometry（ICP-MS） with Microwave Digestion |
| Received:July 03, 2023 Revised:December 25, 2023 |
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| DOI：10.3969/j.issn.2095-1035.2024.04.016 |
| KeyWord:ICP-MS; Elements; Cutback asphalt; microwave digestion; Acid drive; Collision reaction |
| Author | Institution |
| WU Yong-sheng |
湛江海关技术中心 |
| XU Jin-long |
湛江海关技术中心 |
| ZENG Heng-yuan |
湛江海关技术中心 |
| HUANG Wu |
湛江海关技术中心 |
| ZHENG Yu-xi |
湛江海关技术中心 |
| ZHUANG Jiang-yun |
湛江海关技术中心 |
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| Abstract: |
| Diluted asphalt is an intermediate product mainly used for the production of asphalt.At present, there are few methods for determining the element content in diluted asphalt, and the pre-treatment process is cumbersome. In this paper, simultaneously determination of 23 elements was used by Inductively coupled plasma mass spectrometry with microwave digestion , such as aluminum, vanadium, chromium, manganese, iron and cobalt, in the diluted asphalt. By selecting appropriate pre-treatment methods, microwave digestion of diluted asphalt was ultimately used to optimize sample weighing, digestion reagents, and acid driving temperature. Non mass spectrometry interference was corrected by introducing internal standard elements. Mass spectrometry interference was corrected by tuning and optimizing instrument parameters, collision reaction pool He mode, interference equation, and selecting appropriate isotopes. 45Sc, 72Ge, 115In, 209Bi were used as internal standard elements for sample determination, and the detection limit, precision, and accuracy of the method were investigated. Under optimized experimental conditions, 23 elements exhibit a linear relationship with their signal intensity within a certain mass concentration range, with a good linearity of the standard curve and a correlation coefficient of 0.9990 and 1.0000, the detection limit of the method is between 0.0005 and 1.02mg/kg. The recovery rate of the method is determined using spiked recovery, with a recovery range of 80.0 to 110.5%. Seven parallel measurements were conducted on the diluted asphalt sample, and the relative standard deviation of the measured values is between 0.47 and 3.09%. Using this method to determine 23 elements in imported diluted asphalt meets the requirements of national standards for various technical indicators and parameters. The detection limit is low, the selectivity is good, and the results are accurate and reliable. This provides a new reference method for the analysis and determination of multiple elements in diluted asphalt samples. |
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