Additionally, the results show minor errors comparing with chemical methods. The delayed luminescence may become valuable, because it is simple, fast, and sensitive. 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 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 “aromatization rate” value.
No significant changes were found between E 4/6 after adding of metazachlor to HA solutions. 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%. Results showed that the largest particle size, measured by E 4/6 coefficient, was found in HA2 sample, while the smallest in HA3 sample. Spectroscopic techniques have been used to study the HA structure and their interaction with metazachlor including: UV-visible spectroscopy, dynamic light scattering, and delayed luminescence (DL) Results and discussionīased 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). HA have been assessed on the basis of their elemental composition. Metazachlor 500 SC with metazachlor as a biologically active substance has been used. Extraction of humic acids (HA1, HA2, HA3, HA4, and HA5) was performed using a procedure recommended by the International Humic Substances Society.
Materials and methodsįive peatlands have been selected for the study in the southern and northern parts of Poland. The analysis covered the interaction of humic acids (HA) isolated from peats with the metazachlor using spectroscopic methods.
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