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利用傅立叶变换离子回旋共振质谱测定不同季节水源水中天然有机质分子结构

杨红霞*,陈俊良,高津旭,刘崴   

  1. (国家地质实验测试中心, 北京 100037)
  • 出版日期:2017-04-10 发布日期:2017-04-10

Characterization of molecular composition and seasonal variation of natural organic matter in source water using Fourier transform ion cyclotron resonance mass spectrometry.

YANG Hong-xia*, CHEN Jun-liang, GAO Jin-xu, LIU Wei   

  1. (National Research Center for Geoanalysis, Beijing 100037, China).
  • Online:2017-04-10 Published:2017-04-10

摘要: 天然有机质(NOM)在水处理过程中具有重要的意义,其浓度水平和分子组成随时间变化差异很大。本研究采用电喷雾傅立叶变换离子回旋共振质谱技术(ESI-FTICR-MS),测定了山东鹊华水库水源水的NOM组成,并分析其季节变异规律。结果表明:NOM的主要组分为含不同C、H、O的分子组成;van Krevelen图表明,原水NOM中木质素等生物聚合物含量丰富;季节变异规律表明,H/C比率随环加双键数(DBE)的增加而降低,说明对应季节性样品中的分子变得更加不饱和;研究水源水中NOM的组成表征及季节变换规律将有助于制定针对饮用水处理操作的有效方法,确保饮用水水质安全。

关键词: 叶面积指数, 尺度提升, 蒸散发, Penman-Monteith公式

Abstract: Natural organic matter (NOM) is of great significance in water treatment processes. Concentrations and molecular compositions of NOM may vary significantly with time. In particular, the seasonal variations of NOM compositions are site specific and unique to individual source water. In this study, molecular compositions and seasonal variations of NOM in source water from Queshan Reservoir in Shandong were investigated by using electrospray ionization coupled to Fourier transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR-MS). The results demonstrated that various C, H, O-only molecules were the major components in the source water NOM. The van Krevelen diagram showed that compounds corresponding to biopolymers such as lignin were the most abundant components in the source water NOM. From winter to summer, the H/C ratio decreased with a concomitant increase in double bond equivalent (DBE), indicating that the molecules in corresponding seasonal samples became more unsaturated. Understanding NOM compositions and its seasonal variations in source water will help to develop effective strategies for drinking water treatment operation and ensure to meet the requirements of drinking water quality.

Key words: leaf area index, Penman-Monteith equation, scaling up, evapotranspiration