Two-year magnetic monitoring in conjunction with geochemical and electron microscopic data of roadside dust in Seoul, Korea

Kim, Wonnyon; Doh, Seong Jae; Park, Yong‐Hee; Yun, Seong Taek

doi:10.1016/j.atmosenv.2007.05.050

Cited by 106 publications

(59 citation statements)

References 25 publications

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“…These are probably airborne particles from diesel exhaust and emissions from coalburning power plants in Tucson. Such findings are common around industrial areas (10)(11)(12) and reflect the multiple contexts in which microspherules are created and discovered.…”

Section: Resultsmentioning

confidence: 99%

The Murray Springs Clovis site, Pleistocene extinction, and the question of extraterrestrial impact

Haynes

Boerner

Domanik

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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Some of the evidence for the recent hypothesis of an extraterrestrial impact that caused late Pleistocene megafaunal extinctions [Firestone et al. (2007) Proc Natl Acad Sci USA 104:16016–16021] was based upon samples collected at Murray Springs, a Clovis archaeological site in southeastern Arizona. Here we describe sampling and analyses of magnetic separates from within, above, and below the lower Younger Dryas boundary (LYDB) black mat at Murray Springs, as well as radiation measurements from the LYDB at Murray Springs and two other well-stratified Clovis sites. The main magnetic fraction at Murray Springs is maghemite. Magnetic microspherules have terrestrial origins but also occur as cosmic dust particles. We failed to find iridium or radiation anomalies. The evidence for massive biomass burning at Murray Springs is addressed and found to be lacking. We could not substantiate some of the claims by Firestone and others, but our findings do not preclude a terminal Pleistocene cosmic event.

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Section: Resultsmentioning

confidence: 99%

The Murray Springs Clovis site, Pleistocene extinction, and the question of extraterrestrial impact

Haynes

Boerner

Domanik

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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“…Samples were collected at 10 km, 5 km and/or 1 km intervals using the vehicle odometer and about 100 m from the main road to minimize anthropogenic effects and were kept in diamagnetic plastic containers. In particular, this distance helped to avoid transported material and contamination from metal debris left during road construction and from vehicle exhaust fumes (cf Hoffmann et al, 1999;King & Ranganai, 2000;Kim et al, 2007). Plastic shovels were used to avoid 'mineral' contamination and samples were obtained at a depth of 5-30 cm (topsoil), while avoiding compost (organic) material (cf Shi & Ciopaa, 2006).…”

Section: Sample Collection and Preparationmentioning

confidence: 99%

Magnetic Susceptibility of Soils from Eastern Botswana: A Reconnaissance Survey and Potential Applications

Ranganai¹,

Moidaki²,

King³

2015

JGG

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Soil magnetic properties measurements are relatively fast and inexpensive but have been proved to be sufficient for preliminary investigations in diverse socio-developmental issues. This paper presents results of a reconnaissance study of soil colour and magnetic susceptibility (χ) in eastern Botswana, where ~80% of the population resides. The work is a first step to creating a database of rock and soil magnetic properties and to document spatial variations in magnetic properties in the country. These measurements are important as constraints for interpretation of available aeromagnetic data and can also be exploited for environmental soil research (pollution) and land-use planning (agriculture). The soils sampled include derivatives of varying types and provenance such as Archean gneissic granitoids, metamorphosed rocks (granulites), volcano-sedimentary assemblages, Karoo basalts, and alluvial sediments. A soil colour chart was used since soil colours and magnetic properties are diagnostic of its parent rock sources and weathering profiles. Soil magnetic susceptibilities were measured at both low frequency (0.46 MHz, χlf) and high frequency (4.6 MHz, χhf), thus allowing calculation of frequency-dependent susceptibility (χfd, χfd%) for detecting ultra-fine ferromagnetic minerals.It was found that soils with Hues ranging from 7.5YR to 10YR have appreciable amount of magnetic materials and soils with Hues of 2.5YR are generally nonmagnetic. The results of soil magnetic susceptibility profiles show spatial variation closely related to the variation in basement rocks, which provides excellent evidence that the magnetic susceptibility variation reflects basement rocks or bedrock composition (soil parent material). In relation to the Botswana physiographic units, soils from the hardveld (Precambrian) show the highest susceptibilities, followed by those from the sandveld, with the lowest values being from the alluvial. The frequency dependent magnetic susceptibilities indicate the presence of ultra-fine super-paramagnetic minerals such as magnetite/maghemite. It is suggested that a systematic and continuous programme of rock and soil magnetic measurements would benefit various socio-economic and development priority sectors of Botswana. This also applies to many developing countries in Africa where soil physics and measurement of soil susceptibility in particular, is generally still at an embryonic stage.

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“…Large magnetite-like spherules with complex internal structure, as well as the melt-like particles and irregular-shaped grains containing heavy metals were found in the road dust from the industrial zone of Visakhapatnam city (India; Goddu et al 2004). A 2-year magnetic monitoring of roadside dust in Seoul, Korea, revealed that the major magnetic phase is a magnetite-like material, with magnetic concentrations and particle sizes systematically fluctuating seasonally (high and large in winter versus low and small in summer) due to the seasonal influx variation of anthropogenic magnetic materials (Kim et al 2007). Magnetic studies of roadside dust from Seoul, Korea, throughout a 13-month period, demonstrated that seasonal mapping using a mean apparent magnetic concentration (ACM) could be highly informative on the investigation of spatio-temporal pollution characteristics in urban areas (Kim et al 2009).…”

Section: Introductionmentioning

confidence: 98%

Magnetic properties of the road dusts from two parks in Wuhan city, China: implications for mapping urban environment

Yang

Zeng

Liu

et al. 2010

Environ Monit Assess

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Magnetic parameters and heavy metal concentrations of road dusts collected from two parks with distance about 16 km in Wuhan city, China, were measured. The Guishan Park is circled by main roads with heavy traffic, and the Moshan Park is located on the downwind hills of steelworks and a power plant. Mean values of magnetic susceptibility (χ) and saturation magnetization (M (s)) of the dusts from the Moshan Park are 1.31 and 1.57 times those from the Guishan Park, respectively. Their magnetic mineralogy is dominated by pseudo-single domain magnetite; however, minor hematite was also identified in those from the Guishan Park. The dominant sources of non-natural magnetic particles and heavy metals were inferred as windblown emissions from the steelworks and the power plant for the Moshan Park, and road/railway traffics for the Guishan Park, respectively. Spatial variation in magnetic properties of road dust in the two parks and their different magnetic behavior propose that the magnetic measurements are sensitive to the different pollutant origins, as well as the urban environment, and that magnetic techniques have a high efficiency in mapping urban environment. Correlation between magnetic parameters and heavy metal concentrations is strongly site-specific: strong correlations were observed in the Moshan Park with correlation coefficients generally higher than 0.800, whereas correlations are poor in the Guishan Park. Therefore, it is strongly recommended that these relationships should be examined thoroughly before magnetic mapping.

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Two-year magnetic monitoring in conjunction with geochemical and electron microscopic data of roadside dust in Seoul, Korea

Cited by 106 publications

References 25 publications

The Murray Springs Clovis site, Pleistocene extinction, and the question of extraterrestrial impact

The Murray Springs Clovis site, Pleistocene extinction, and the question of extraterrestrial impact

Magnetic Susceptibility of Soils from Eastern Botswana: A Reconnaissance Survey and Potential Applications

Magnetic properties of the road dusts from two parks in Wuhan city, China: implications for mapping urban environment

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