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)

Simultaneous/selective voltammetric detection of diclofenac and tetracycline in water on graphene modified-boron-doped diamond electrode

The graphene oxide modified boron-doped diamond electrode (GO/BDD) was obtained electrochemically and tested by cyclic voltammetry (CV) to detect diclofenac (DCF) from antiinflammatory pharmaceuticals class and tetracycline (TC) from antibiotics one, which belongs to emerging pollutants from water. Graphene reduced electrochemically from its oxide showed enhanced sensitivity in determining individual and selective or simultaneous of DCF and TC. The cyclic voltammetry method - based protocol for selective/simultaneous detection of DCF and TC was developed in this study using a commercial boron-doped diamond (BDD) electrode modified with graphene oxide (GO)

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

Lemna minor L. and Pistia stratiotes L. in the accumulation of total phosphorus from the water

In this study we wanted to evaluate the absorption capacity of total phosphorus (TP) from water by two aquatic plants (Lemna minor L. and Pistia stratiotes L.) belonging to the same family (Araceae) which have a huge potential for remediation the water loaded with organic and inorganic substances (total phosphorus, total nitrogen, heavy metals, etc.). Four experimental variants with initial concentrations of total phosphorus in water of 4, 6, 8 and 10 mg/L (TP 4, TP 6, TP 8 and TP 10) at an ambient temperature of 25° C were used to achieve these things. The total amount of phosphorus was quantified at the initial moment and after 72 hours both in water (expressed in mg/L), and in plants (expressed in g/kg of dry matter), respectively. The best results were given by the Lemna minor L. plant at an initial phosphorus concentration in water of 6 mg/L

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