Application of the Long-Term Delayed Luminescence for Study of Natural Water Environments

Prokowski, Zdzisław; Mielnik, Lilla

doi:10.5772/28478

Cited by 2 publications

(4 citation statements)

References 13 publications

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“…Research showed that, under established conditions of excitation, the capability of HS to delayed luminescence depends primarily on the origin of OM and the conditions under which transformation of OM undergoes (Mielnik 2009;Mielnik et al 2009;Prokowski and Mielnik 2012). The use of photoluminescence in water environment studies may enable the development of indicators to better understand the luminescence properties of HS specific to a given body.…”

Section: Introductionmentioning

confidence: 99%

Using delayed luminescence to characterize humic acids from lake sediments

Mielnik

Asensio

2018

J Soils Sediments

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Purpose Using the delayed luminescence (DL) method, the photoluminescent properties of humic acids (HA) extracted from lake sediments were analyzed. Delayed luminescence is a promising technique for characterizing HA and other forms of organic matter of various origins. But information is insufficient regarding both its optimal operating conditions and also those environmental factors that control the chemical constitution of samples, which affects patterns of delayed luminescence. Materials and methods The research material was HA from lake sediments. Humic acid extractions were carried out using the method developed by the International Humic Substances Society. Studies on excitation and recording of DL intensity of HA solutions were carried out with the use of a specially designed device for continuous recording of photo-induced luminescence. The DL was excited with a monochromatic light at multiple wavelengths. Results and discussion The DL intensity depended on the wavelength of the exciting light. The highest DL intensity was obtained with excitation by blue light, the lowest DL intensity was observed with excitation by red light. Statistically significant differences among DL intensity were observed in the examined humic acids. These differences may be evidence of the variable quantitative and qualitative contributions of photoluminophores to the structure of the studied HA molecules as well as their different photochemical reactivities. For the blue-and green-excited DL intensity, statistically significant positive correlations were obtained with the elemental atomic ratio O:H and CQ coefficient. For the red-excited DL intensity, statistically significant positive correlations were obtained with the C and H content and H:C, C:N atomic ratios, while negative correlations were obtained with the free radical concentration. Conclusions Delayed luminescence depended on the wavelength of the exciting light. The DL intensity excited by blue and green light was different than the red light-excited DL intensity. The DL depended on the primary composition of sediments and the properties and structure of HA too. The grouping of HA showed that the HA formed in organic matter-poor, silicate-rich sediments had greater DL emission than did those extracted from sediments that were enriched in organic matter.

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Section: Introductionmentioning

confidence: 99%

Using delayed luminescence to characterize humic acids from lake sediments

Mielnik

Asensio

2018

J Soils Sediments

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“…Humic acids show their ability to emit electromagnetic radiation as delayed luminescence (e.g., Bejger et al 2011;Mielnik 2013). Studies by Mielnik (2009), Mielnik (2013 and Prokowski and Mielnik (2012) showed that DL intensity of HA solutions depends on the excitation light wavelength and the quantity and quality of active centers (luminophores) in molecules of those substances. Humic substances are polyphenol-nitrogen polycondensates.…”

Section: Resultsmentioning

confidence: 99%

“…It is known that, HS act as photosensibilizators, which can activate many photochemical processes (Aguer et al 1999;Nkhili et al 2014). DL has been found as a sensitive and efficient method for monitoring of the aquatic environment state (Mielnik 2009;Prokowski and Mielnik 2012). So far, the studies of the interaction of humic acids with organic pollutants, using delayed luminescence, have not been conducted.…”

Section: Introductionmentioning

confidence: 99%

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Studying of the interaction between peat humic acids and metazachlor using spectroscopy methods

et al. 2018

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Purpose The analysis covered the interaction of humic acids (HA) isolated from peats with the metazachlor using spectroscopic methods. Materials and methods Five peatlands have been selected for the study in the southern and northern parts of Poland. Extraction of humic acids (HA1, HA2, HA3, HA4, and HA5) was performed using a procedure recommended by the International Humic Substances Society. Metazachlor 500 SC with metazachlor as a biologically active substance [2-chloro-N-(pyrazol-1-ylmethyl)acet-2′,6′-xylidide] has been used. HA have been assessed on the basis of their elemental composition. Spectroscopic techniques have been used to study the HA structure and their interaction with metazachlor including: UVvisible spectroscopy, dynamic light scattering, and delayed luminescence (DL) Results and discussion Based on their morphological and chemical properties, the studied peat soils can be classified as follows: (1) Eutric Murshic Sapric Histosols, (2) Eutric Sapric Histosols, (3) Eutric Hemic Histosols, (4) Eutric Fibric Histosols, and (5) Dystric Dranic Hemic Histosols according to the WRB guidelines (2015). Results showed that the largest particle size, measured by E 4/6 coefficient, was found in HA2 sample, while the smallest in HA3 sample. The addition of metazachlor to HA solutions reduced the values of E 4/6 coefficient by 33 to 72%, while the values of hydrodynamic diameter by 4 to 32%. No significant changes were found between E 4/6 after adding of metazachlor to HA solutions. The largest changes in DL intensity, excited both by blue and red light after herbicide addition, were observed in HA2 sample, which is characterized by the largest particle size, the highest oxygen content and CQ value as well as the lowest Baromatization rate^value. Conclusions The particle sizes of HA molecules measured by E 4/6 coefficient do not impact on the particle sizes of HA-herbicide systems measured by the same ratio. The delayed luminescence may become valuable, because it is simple, fast, and sensitive. Additionally, the results show minor errors comparing with chemical methods. This method may provide information about structure and nature of humic acids, as well as their photoreactivity. The using of delayed luminescence in studies of HApesticides interaction may enable us to better understand the luminescence properties of HA.

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Application of the Long-Term Delayed Luminescence for Study of Natural Water Environments

Cited by 2 publications

References 13 publications

Using delayed luminescence to characterize humic acids from lake sediments

Using delayed luminescence to characterize humic acids from lake sediments

Studying of the interaction between peat humic acids and metazachlor using spectroscopy methods

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