Extraction kinetics and quantitative analysis of bottom sediments for humic substances

Khodorenko, N. D.; Volkova, T. I.; Zvalinskii, V. I.; Tishchenko, P. Ya.

doi:10.1134/s0016702912040039

Cited by 14 publications

(4 citation statements)

References 10 publications

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“…The average mass of HM was approximately 10% of the average mass of SOM (Table 1). As expected, the HM fraction was smaller because HM is a different elemental component of SOM that comprises less of the total mass of SOM than SOC (Beyer, 1993; Valladares et al, 2007; Khodorenko et al, 2012; Susic, 2016). It is also assumed that the HM extraction has the same relative efficiency for different soils, but recovery of HM is highly variable (Lamar and Talbot, 2009).…”

Section: Resultssupporting

confidence: 71%

Comparing Four Methods of Measuring Soil Organic Matter in North Carolina Soils

Roper

Robarge

Osmond

et al. 2019

Soil Science Soc of Amer J

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Results of agronomic management effects on SOM are inconsistent among methods. Correlations among methods of measuring SOM differ depending on soil. Soil organic matter content should be compared using similar procedures. Soil organic matter (SOM) provides many beneficial soil ecosystem services for sustainable soil management, but it is unclear how results from different methods of measuring SOM should be compared when making soil management decisions. To compare different methods, we used 84 soil samples from long‐term agronomic trials in the coastal plain, piedmont, and mountain regions of North Carolina. Coastal plain and mountain trials included combinations of tillage and management (conventional vs. organic), whereas piedmont trials were configured to evaluate tillage intensity. The methods used to measure SOM were Walkley‐Black (WB), mass loss on ignition (LOI), automated dry combustion (ADC), and humic matter (HM) colorimetry. Correlations among LOI, WB, and ADC were significant (p < 0.0001) for SOM measured from the total population of soils, but variability due to location implied that HM had no correlation to other methods. For measures of soil organic carbon compared to SOM, the WB results were biased high compared to ADC, and ADC was more strongly correlated to LOI than WB. When using the methods to evaluate the effects of agronomic management on SOM, results varied for different methods and locations. Conservation management did not consistently accumulate more SOM than other soil management practices, and no method consistently differentiated soils based on management. Variation in the composition of SOM measured using conventional methods may be causing discrepancies in reported changes in SOM content over time. To avoid confusion about how agronomic management affects SOM, assessments should limit comparisons to methodologies with similar measurement protocols.

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Section: Resultssupporting

confidence: 71%

Comparing Four Methods of Measuring Soil Organic Matter in North Carolina Soils

Roper

Robarge

Osmond

et al. 2019

Soil Science Soc of Amer J

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“…The content of carbon in the humic acid fraction (Cha) was over ten times smaller than the content of carbon in the fulvic acid fraction (Cfa) (Table 1). Hou et al (2014) and Khodorenko et al (2012) also observed a 1.5–3 times higher content of Cfa than of Cha in the bottom sediment. The predominance of the Cfa fraction over the Cha fraction can be associated with alkaline environments in the reservoir, as the mean value of the water pH in the Rybnik reservoir was 8.05.…”

Section: Resultsmentioning

confidence: 88%

The influence of the quantity and quality of sediment organic matter on the potential mobility and toxicity of trace elements in bottom sediment

Baran

Mierzwa–Hersztek

Gondek

et al. 2019

Environ Geochem Health

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Knowledge on the fraction of trace elements in the bottom sediments is a key to understand their mobility and ecotoxicological impact. The purpose of this study was to assess the influence of the content of organic matter fractions on the mobility and ecotoxicity of trace elements in sediments from the Rybnik reservoir. The most refractory fraction of organic matter—Cnh (non-hydrolysing carbon)—dominated in the sediments. The content of organic matter fractions are arranged in the following order: Cnh (non-hydrolysing carbon) > Cfa (fulvic acid) > Cha (humic acid) > DOC (dissolved organic carbon). On the other hand, the highest value of correlation coefficients was found for different fractions of trace elements and DOC content in the bottom sediments. A higher content of TOC in the sediments significantly increased the share of elements in the potential mobile fraction and, at the same time, decreased the binding of elements in the mobile fractions. Moreover, in sediments that contain more than 100 g/kg d.m. TOC, no and medium risk of trace element release from sediments was observed. The Cu, Cd and Ni were potentially the most toxic elements for biota in the Rybnik reservoir. However, the correlation between the content of trace elements and the response of bacteria was insignificant. These results suggested that the complexation of trace elements with organic matter makes them less toxic for Vibrio fischeri. The transformation and sources of organic matter play an important role in the behaviour of trace elements in the bottom sediments of the Rybnik reservoir.

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“…Nearly the same spectral characteristics are inherent to soluble vegetative lignine and model humin-like polymers [40]. Fluorescence of humic acids and humin is related to the excitation of π-electron systems in aromatic condensed rings whose amount can even increase during sample pyrolysis [41]. Intense blue-green fluorescence bands in the studied soil samples are attributed to pterin [41] and flavin [42,43] coenzymes, which had a fluorescence similar to that for Euglena gracilis seaweed [44].…”

Section: Resultsmentioning

confidence: 81%

“…Fluorescence of humic acids and humin is related to the excitation of π-electron systems in aromatic condensed rings whose amount can even increase during sample pyrolysis [41]. Intense blue-green fluorescence bands in the studied soil samples are attributed to pterin [41] and flavin [42,43] coenzymes, which had a fluorescence similar to that for Euglena gracilis seaweed [44]. The LIDAR was able to detect pigments immediately onsite in its native form.…”

Section: Resultsmentioning

confidence: 91%

Remote Laser Induced Fluorescence of Soils and Rocks

Lednev¹,

Бункин²,

Першин³

et al. 2021

Photonics

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The laser induced fluorescence spectroscopy was systematically utilized for remote sensing of different soils and rocks for the first time, to the best of our knowledge. Laser induced fluorescence spectroscopy measurements were carried out by the developed nanosecond LIDAR instrument with variable excitation wavelength (355, 532 and 1064 nm). LIDAR sensing of different Brazil soil samples have been carried out in order to construct a spectral database. The laser induced fluorescence spectra interpretation for different samples has been discussed in detail. The perspectives of LIDAR sensing of organic samples deposited at soils and rock have been discussed including future space exploration missions in the search for extraterrestrial life.

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Extraction kinetics and quantitative analysis of bottom sediments for humic substances

Cited by 14 publications

References 10 publications

Comparing Four Methods of Measuring Soil Organic Matter in North Carolina Soils

Comparing Four Methods of Measuring Soil Organic Matter in North Carolina Soils

The influence of the quantity and quality of sediment organic matter on the potential mobility and toxicity of trace elements in bottom sediment

Remote Laser Induced Fluorescence of Soils and Rocks

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