Iron isotopic compositions of combustion source particles and mineral dust

IF 2 4区环境科学与生态学 Q3 CHEMISTRY, ANALYTICAL Environmental Chemistry Pub Date : 2021-01-01 DOI:10.7524/J.ISSN.0254-6108.2020081502

L. Rui, Zhang Huanhuan, He Yuting, An Yajun, Zhang Zhaofeng, Tang Mingjin

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引用次数: 1

Abstract

Iron,one of the essential micronutrients for life,would largely promote oceanic primary productivity. Atmospheric deposition has been recognized as the dominant source of bioavailable iron in the open ocean;however,the relative contribution of combustion aerosol and mineral dust to bioavailable iron in the ocean remains poorly understood. The development of iron isotope techniques provides a new way for tracing iron sources. The application of iron isotope technique in atmospheric and oceanic sciences is still limited,and iron isotopic compositions of aerosols from various sources are not well understood. In this study,we selected one Chinese coal fly ash,two American coal fly ashes,one European city waste fly ash and three mineral dust samples from different regions (Arizona test dust from America,Luochuan Loess from China,and Xinjiang dust from China) and measured their iron contents and iron isotopic compositions. The maximum mass fraction of iron in coal fly ash was measured to be ~10%,significantly higher than those for city waste fly ash and mineral dust (both in the range of 2% to 4%). The δ56Fe values were determined to be 0.05‰-0.75‰ for the four fly ash samples and -0.05‰-0.21‰ for three mineral dust samples,respectively. Compared with mineral dust,combustion source particles showed heavier iron isotopic compositions,probably attributed to large variations in physicochemical properties of fuels and fly ashes.

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燃烧源颗粒和矿物粉尘的铁同位素组成

铁是生命必需的微量元素之一，它将在很大程度上提高海洋的初级生产力。大气沉积已被认为是开放海洋中生物可利用铁的主要来源;然而，燃烧气溶胶和矿物粉尘对海洋中生物可利用铁的相对贡献仍然知之甚少。铁同位素技术的发展为铁源溯源提供了新的途径。铁同位素技术在大气和海洋科学中的应用仍然有限，各种来源气溶胶的铁同位素组成还没有得到很好的了解。本研究选取了1个中国煤炭粉煤灰、2个美国煤炭粉煤灰、1个欧洲城市垃圾粉煤灰和3个不同地区的矿物粉尘样品(美国亚利桑那州试验粉尘、中国洛川黄土粉尘和中国新疆粉尘)，测定了它们的铁含量和铁同位素组成。煤飞灰中铁的最大质量分数为~10%，明显高于城市垃圾飞灰和矿物粉尘(均在2% ~ 4%之间)。测定了4种粉煤灰样品的δ56Fe值为0.05‰~ 0.75‰，3种矿物粉尘样品的δ56Fe值为-0.05‰~ 0.21‰。与矿物粉尘相比，燃烧源颗粒显示出更重的铁同位素组成，这可能归因于燃料和飞灰的物理化学性质的巨大变化。

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来源期刊

Environmental Chemistry 环境科学-分析化学

CiteScore

4.50

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Environmental Chemistry publishes manuscripts addressing the chemistry of the environment (air, water, earth, and biota), including the behaviour and impacts of contaminants and other anthropogenic disturbances. The scope encompasses atmospheric chemistry, geochemistry and biogeochemistry, climate change, marine and freshwater chemistry, polar chemistry, fire chemistry, soil and sediment chemistry, and chemical aspects of ecotoxicology. Papers that take an interdisciplinary approach, while advancing our understanding of the linkages between chemistry and physical or biological processes, are particularly encouraged. While focusing on the publication of important original research and timely reviews, the journal also publishes essays and opinion pieces on issues of importance to environmental scientists, such as policy and funding. Papers should be written in a style that is accessible to those outside the field, as the readership will include - in addition to chemists - biologists, toxicologists, soil scientists, and workers from government and industrial institutions. All manuscripts are rigorously peer-reviewed and professionally copy-edited. Environmental Chemistry is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.