Source apportionment of fine atmospheric particles in Bloemfontein, South Africa, using positive matrix factorization.

Air pollution is of major health and environmental concern globally and in South Africa. Studies on the sources of PM2.5 air pollution in low- and middle-income countries such as South Africa are limited. This study aimed to identify local and distant sources of PM2.5 pollution in Bloemfontein. PM2.5 samples were collected from June 16, 2020 to August 18, 2021. Trace element concentrations were determined by EDXRF spectroscopy. By use of the US EPA PMF 5.0 program, local sources were determined to be combustion/wood burning (49%), industry (22%), soil dust (10%), base metal/pyrometallurgical and traffic (9.6%) and water treatment/industry (9.4%). The HYSPLIT program was applied to determine distant PM2.5 source areas and the following clusters were identified: Mpumalanga province (52%), Northern Cape province (35%), Indian Ocean (8%) and Atlantic Ocean (6%). The majority of the air was found to come from the Mpumalanga province in the north-east, while the majority of local sources are ascribed to combustion/wood burning. Results from this study can be used to develop an Air Quality Management Plan for Bloemfontein.

Polypyridine OsII complexes electrochemical data.

The data presented in this article are relevant to the research article, "Electrochemistry of Os bipyridyl and phenanthroline complexes, comparison with Ru and Fe" (van der Westhuizen, 2020). Cyclic voltammograms illustrating OsII/III oxidations of eight osmium(II) complexes are presented in this article. The data were obtained under similar experimental conditions, at scan rates with magnitudes ranging from 0.05 V.s-1 to 10.00 V.s-1, in acetonitrile as solvent and tetrabutylammonium hexafluorophosphate as supporting electrolyte. Potentials are reported versus the iron(II) redox couple in ferrocene.

Electrochemical data of polypyridine complexes of Ru(II).

The data here-in presented is associated to the research article, Electrochemistry and spectroscopy of substituted [Ru(phen)3]2+ and [Ru(bpy)3]2+ complexes [1]. Redox data obtained from cyclic voltammetry experiments of the oxidation of Ru(II) to Ru(III) of thirteen Ru(II)-polypyridine complexes is presented in this data in brief article. Data is obtained from the cyclic voltammograms at scan rates of two orders of magnitude (0.05-5.00 Vs-1) under similar experimental conditions, namely in acetonitrile as solvent and tetrabutylammonium hexafluorophosphate as supporting electrolyte, and reported versus the redox couple of Fe(II) of ferrocene.