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Humic Acid and Related Substances in the Environment
Published in B. K. Afghan, Alfred S. Y. Chau, Analysis of Trace Organics in the Aquatic Environment, 2017
Unlike most chemical constituents in water, these compounds are not well defined with specific chemical structure. Berzelius19 first isolated dissolved humic material in 1833 from a mineral spring in Sweden. He noted similarities between this material and the humic material extracted from soil.Humic substances are a series of acidic, dark colored, predominantly aromatic, chemically complex, high molecular weight polyelectrolytes. They are highly resistant to microbial decomposition and represent one of the most stable fractions of natural organic matter. Dissolved humic material can be divided into two main fractions, humic acid and fulvic acid, based on their solubility in acid and alkali.1 Humic acid is that fraction that is soluble at pH 9 but insoluble at pH 2, whereas fulvic acid is that fraction which is soluble at pH 2 and at pH 9.
Ecological-geochemical problems of abandoned mine lands
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
L.N. Ginzburg, A.A. Kremenetsky, T.D. Zangieva, O.A. Mayorova, O.V. Menchinskaya, V.V. Shatov, C. Stanley, R. Seltmann, L. Raimbault
By the results of physicochemical investigations it can be stated that technogenic geochemical barriers of the sorption class can represent areas of the sewerage collector, mineral spring «Arshan», close to the guest house «Rodnik», the tailings pond. The results of investigations allow us to divide the metals according to the degree of chemical mobility in In H2SO4 into three groups: 1) Cd, Mn, V, Cr, Co, Ni. Bi - highly mobile metals in most samples from the reference sites; 2) Mo, Cu, W, B_, Sn, Ge - mobile metals in some samples; 3) Pb, Ti, Zn, Ag - metals that have no mobile forms.
Magnetic sorbents biomineralization on the basis of iron sulphides
Published in Environmental Technology, 2018
Jana Jencarova, Alena Luptakova, Nikola Vitkovska, Dalibor Matysek, Petr Jandacka
A mixed culture of SRB was enriched from the mineral spring Gajdovka (locality Kosice, Slovakia). This water was classified as potable, natural, mineralized (calcium-sodium-magnesium, bicarbonate-chloride, carbonated, sulphur) water; hypotonic, cold (temperature 12.5°C), with pH 7–8 and strong H2S odour. The presence of SRB was monitored by microscopic observation (after Gram staining, immersed in oil and magnified 1200X) using the light microscope Nikon Eclypse 400. This enrichment is dominated by bacteria of the genus Desulfovibio.