Influence of time and storage conditions of humic acids (HA) solutions on their optical properties
2009
Mielnik, L., Akadémia Rolnicza w Szczecinie, Szczecin (Poland) | Sitarski, A.
The research refers to influence of time and storage conditions of humic acids (HA) solutions on optical properties. HA coming from lake sediment was subjected to examinations. The 0.1 M NaOH solution was used to the HA extraction. The UV-VIS absorption analysis and the measurement of intensity of the long-term photo-induced luminescence were carried out for obtained HA extracts. The analyses were done after different time of preservation of the HA solutions at the room temperature of 24 deg C with access to daylight as well as at the temperature of 4 deg C in the darkness (in a refrigerate). They found that conditions in which HA extracts intended for analyses were being deposited had significant influence of HA particles on structural changes.
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