Mass fractions, solubility, speciation and isotopic compositions of iron in coal and municipal waste fly ash

Li, Rui; Zhang, Huanhuan; Wang, Fu; He, Yuting; Huang, Chengpeng; Luo, Lan; Dong, Shujun; Jia, Xiaoxu; Tang, Mingjin

doi:10.1016/j.scitotenv.2022.155974

Cited by 13 publications

(11 citation statements)

References 85 publications

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“…In this study, we constrained the concentrations of metals (Fe and Mn) in the multiphase model by setting the solubility of Fe as 1% and Mn solubility as 20%. These constraints are within the range of observations from previous studies. − VOC emissions were also integrated into the model to better represent urban chemistry . The simulated OH radical concentrations in the gas and aqueous phase are within a reasonable range compared with previous studies (Figure S4), indicating that the model results are reasonable.…”

Section: Methodssupporting

confidence: 70%

Trace Metals Reveal Significant Contribution of Coal Combustion to Winter Haze Pollution in Northern China

Shen,

Xue,

Fan

et al. 2024

ACS EST Air

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While the contribution of coal combustion to atmospheric particulate matter is well-recognized, its specific role in winter haze remains insufficiently explored. In this study, we elucidate the quantitative effect of coal combustion on winter haze pollution based on high temporal resolution measurements of trace metals in PM2.5. We identified arsenic (As) and selenium (Se) as reliable indicators of coal combustion, with their enrichment factors exceeding 104. The significant increase in As and Se concentrations (9.6-fold and 7.1-fold increase) during severe haze episodes underscores the enhanced contribution of coal combustion to winter haze pollution. Chemical mass closure results indicate that primary emissions from coal combustion contribute 15% to PM2.5, with its proportion in primary PM2.5 mass reaching 42% and 57% during non-haze and haze episodes, respectively. Simulations utilizing the multiphase chemical model (RACM-CAPRAM) indicate that transition metal-catalyzed oxidation is responsible for 68% of secondary sulfate formation, with the aqueous phase and surface catalysis contributing 59% and 9%, respectively. Excluding coal combustion-emitted SO2, Mn, and Fe results in a 49% reduction in secondary sulfate production. This research presents a comprehensive assessment of the impact of coal combustion on winter haze in northern China, offering vital insights for formulating effective pollution control strategies in the future.

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Section: Methodssupporting

confidence: 70%

Trace Metals Reveal Significant Contribution of Coal Combustion to Winter Haze Pollution in Northern China

Shen,

Xue,

Fan

et al. 2024

ACS EST Air

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“…In addition, the excess sFe correlates significantly with the water-soluble V, Ni, and Pb in aerosols (Figure b–d), suggesting the presence of other sources rather than natural mineral dust, such as anthropogenic combustion. Using K/Al and V/Al together after correcting for the sea salt effect, we investigated the previously suggested major sources of excess sFe in the aerosol over the past 20 years, including natural and anthropogenic sources ,,,,,− (Figure a). It should be noted that biomass burning includes not only naturally occurring wildfires but also human-derived agricultural activities.…”

Section: Resultsmentioning

confidence: 99%

Anthropogenic Iron Invasion into the Ocean: Results from the East Sea (Japan Sea)

Seo

Kim

2023

Environ. Sci. Technol.

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Iron (Fe) is an essential micronutrient for phytoplankton growth, and its availability limits primary production in half of the global ocean. Traditionally, atmospheric input of natural mineral dust has been considered as a main source of Fe in the surface ocean. However, here we show that about 45% of the water-soluble Fe in aerosols collected over the East Sea (Japan Sea) is anthropogenic, which originates mainly from heavy fuel oil combustion, based on the analyses of various chemical tracers (Al, K, V, Ni, Pb, and 210 Pb). It is striking that a tiny quantity of oil, less than 1% of the aerosols in mass, can constitute the majority of water-soluble Fe in aerosols due to its high Fe solubility. Furthermore, we show that a quarter of dissolved Fe in the East Sea is anthropogenic using a 210 Pb-based scavenging model. Since this sea is almost fully enclosed (200−3000 m) and located at the forefront of the Asian human footprint, our results provide an insight that the marine Fe cycle may be already perturbed by human activities.

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“…9b). In addition, non-magnetic aluminosilicates of coal combustions and MSWI could not increase the EF of Fe in fine aerosol particles because the EF of Fe in these ashes was almost 1 (Sakata et al, 2022;Li et al, 2022). Therefore, non-magnetic aluminosilicates derived from coal combustion and MSWI were unlikely the dominant source of aerosol particles with high Fesol% and [d-Fe]/[d-Al] ratios.…”

Section: The [D-fe]/[d-al] Ratio Of Non-crustal Fe: Non-magnetic Frac...mentioning

confidence: 99%

Measurement report: Stoichiometry of dissolved iron and aluminum as an indicator of the factors controlling the fractional solubility of aerosol iron: Results of the annual observations of size-fractionated aerosol particles in Japan

Sakaguchi

Yamakawa

Miyamoto

et al. 2023

Preprint

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Abstract. Atmospheric deposition of iron (Fe) in aerosol particles is enhanced primary production on the ocean surface, resulting in promoting the uptake of carbon dioxide into the surface seawater. Atmospheric deposition of iron (Fe) promotes primary production in the surface ocean, resulting in enhanced uptake of carbon dioxide into surface seawater. Since microorganisms in seawater utilize dissolved Fe (d-Fe) as a nutrient, the bioavailability of Fe in aerosol particles depends on its solubility. However, factors controlling fractional Fe solubility (Fesol%) in aerosol particles have not been fully understood. This study performed annual observations of Fesol% in size-fractionated (seven fractions) aerosol particles at Higashi-Hiroshima, Japan. In particular, the feasibility of the molar concentration ratio of d-Fe relative to dissolved Al ([d-Fe]/[d-Al]) as an indicator of the sources of d-Fe in aerosol particles because this ratio is likely dependent on the emission sources of Fe (e.g., mineral dust, fly ash, and anthropogenic Fe oxides) and their dissolution processes (proton-promoted and ligand-promoted dissolutions). Approximately 70 % of total Fe and dissolved Fe was present in coarse and fine aerosol particles, respectively, and the average Fesol% in fine aerosol particles (11.4 ± 6.97 %) was higher than that of coarse aerosol particles (2.19 ± 2.27 %). In addition, the average ratio of [d-Fe]/[d-Al] in coarse aerosol particles (0.408 ± 0.168) was lower than that in fine aerosol particles (1.15 ± 0.803). The range of [d-Fe]/[d-Al] ratios in the coarse aerosol particles (0.121–0.927) was similar to that obtained by proton-promoted dissolutions of mineral dust (0.1–1.0), indicating that d-Fe in coarse aerosol particles were derived from mineral dust. The [d-Fe]/[d-Al] ratios of aerosol particles ranged from 0.386 to 4.67, and [d-Fe]/[d-Al] ratios greater than 1.5 cannot be explained by proton-promoted dissolution and ligand-promoted dissolution (1.0 < [d-Fe]/[d-Al] < 1.5). The [d-Fe]/[d-Al] ratio correlated with the enrichment factor of Fe in fine aerosol particles (r: 0.505), indicating that anthropogenic Fe with a high [d-Fe]/[d-Al] ratio was the source of d-Fe in fine aerosol particles. The high [d-Fe]/[d-Al] ratio was attributed to Fe-oxides emitted from high-temperature combustions (high-temp-FeOx). Finally, the fraction of high-temp-FeOx to d-Fe in total suspended particulate (TSP) was calculated based on the [d-Fe]/[d-Al] ratio of aerosols and their emission source samples. As a result, the fraction of high-temp-FeOx to d-Fe in TSP varied from 1.48 to 80.7 %. The high fraction was found in summer when air masses originated from industrial regions in Japan. By contrast, approximately 10 % of d-Fe in the TSP samples collected in spring and during Asian dust events was derived from high-temp-FeOx, when air masses were frequently transported from East Asia to the Pacific Ocean. Thus, mineral dust is the dominant source of d-Fe in Asian outflow to the Pacific Ocean.

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Mass fractions, solubility, speciation and isotopic compositions of iron in coal and municipal waste fly ash

Cited by 13 publications

References 85 publications

Trace Metals Reveal Significant Contribution of Coal Combustion to Winter Haze Pollution in Northern China

Trace Metals Reveal Significant Contribution of Coal Combustion to Winter Haze Pollution in Northern China

Anthropogenic Iron Invasion into the Ocean: Results from the East Sea (Japan Sea)

Measurement report: Stoichiometry of dissolved iron and aluminum as an indicator of the factors controlling the fractional solubility of aerosol iron: Results of the annual observations of size-fractionated aerosol particles in Japan

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