The role of temperature in the bioaccumulation processes of mangan from surface water, in species Salvinia natans (L.) All.

In this article we wanted to demonstrate the influence that temperature has on the processes of manganese accumulation in the species Salvinia natans (L.) All. In order to reach the proposed objective, different concentrations of manganese present in the water were tested at different temperature levels (15°, 25° and 35° C) and the samples of plant material were analyzed at different time intervals (0h, 24h, 72h and 120h)

Voltammetric detection of tetracycline in water at boron-doped diamond electrode

In this work a voltammetric based protocol for detection of tetracycline (TC), considered as emergent pollutant in water, was developed. The electrochemical behavior of TC studied by cyclic voltammetry was considered to optimize operating conditions of advanced voltammetric tehniques, e.g., differential-pulsed voltammetry (DPV) and square-wave voltammetry (SWV). The best electroanalytical parameters for TC detection of 2,29 µA/µM sensitivity and limit of detection (LOD) were achieved using SWV under SP of 0.05V, MA of 0.1V and frequency of 10 Hz

Diatoms and their role in aquatic ecosystems

The present article aimed to determine diversity and abundance of diatoms in the river basin of the Cerna River. In order to achieve the objective, samples were taken from the entire course of the river, from 9 specific points (I, II, III, IV, V, VI, VII, VIII, IX) in spring-summer of 2020. 53 species of diatoms classified in 21 genera were determined

Influence of phosphorus and nitrates on the species development of Lemna minor L.

In this paper we wanted to determine the influence of phosphorus and nitrates in the development of Lemna minor L. To achieve this purpose, eight different growth variants were proposed, starting from the Hoagland culture medium, where the concentration of these two compounds varied. The growth rate in the eight experimental variants, ranges between 150% - 325%, with a minimum in the control sample and a maximum at the highest concentration of phosphorus in water

Graphene Oxide Electroreduced onto Boron-Doped Diamond and Electrodecorated with Silver (Ag/GO/BDD) Electrode for Tetracycline Detection in Aqueous Solution

A new electrochemical sensor designed by modifying the commercial boron-doped diamond (BDD) electrode with graphene oxide (GO) reduced electrochemically and further electrodecorated with silver (Ag), named the Ag/GO/BDD electrode, was selected among a series of the BDD, GOelectroreduced onto BDD (GO/BDD) and silver electrodeposited onto BDD (Ag/BDD) electrodes for the detection of tetracycline (TC) in aqueous solution. The best results regarding the sensitivity of 46.6 µA·µM−1·cm−2 and the lowest limit of detection of 5 nM was achieved using square-wave voltammetry (SWV) operated at the step potential of 5 mV, modulation amplitude of 200 mV and the frequency of 10 Hz in alkaline medium. The application of the alkaline supporting electrolyte-based procedure is limited for water monitoring due to the presence of chloride that interferes with TC detection; however, it can be applied for quantitative determination of pharmaceutical formulations. 0.1 M Na2SO4 supporting electrolyte eliminated chloride interference and can be used for the application of Ag/GO/BDD in practical detection of TC in water