Naslov
Coal-derived sulphur and selenium in marine sediment cores (Raša Bay, Croatia): recommended steps of analysing environmental earth data

Autori
Kang, Shuai ; Ivošević, Tatjana ; Medunić, Gordana ; Dai, Shifeng

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), stručni

Izvornik
Mathematical methods and terminology in geology 2022 / Malvić, Tomislav ; Ivšinović, Josip - Zagreb : Rudarsko-geološko-naftni fakultet Sveučilišta u Zagrebu, 2022, 75-83

ISBN
978-953-6923-48-9

Skup
Mathematical methods and terminology in geology 2022

Mjesto i datum
Zagreb, Hrvatska, 24.10.2022. - 25.10.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Raša coal ; sulphur ; selenium ; sediment cores ; nonparametric data analysis

Sažetak
Coal may be the most complex geological material that is commonly enriched in sulphur (S) and selenium (Se). Coal combustion and related industries release the two elements into the environment. Considering the fact that both elements can have beneficial as well as detrimental effects on living systems, the knowledge of their fate in the ecosphere should be a matter of the utmost importance. Croatian superhigh-organic-sulphur (SHOS) Raša coal (Raša Bay, Croatia) is highly enriched in S and Se, the levels of which are usually as high as 9-11%, and 50 mg/kg, respectively. Several point sources of the two elements contaminate the Raša study area. The aim of this study was to explore depth profiles of S and Se by collecting seven sediment cores (down to 30-50 cm) from the Raša Bay, and by determining their levels with sulphur carbon analyser and ICP-MS, respectively. Data analysis showed that the both elements were elevated in two sediment cores located closest to a former Raša coal separation and washing facility, which was a source of wastewater disposed of directly in the bay during the period 1930s-1960s. Minimum to maximum S and Se levels in sediments were 0.22– 2.6%, and 0.11–12 mg/kg, respectively. In the most contaminated sediment core the correlation S-Se was 0.87 (p = 3.3E-05). Differences among sites were statistically significant for both elements. This paper shows how to analyse environmental data by using nonparametric methods. Also, this paper should increase the public awareness of the marine Raša Bay environmental status.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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