scholarly journals Use of Nutrient Anchored Polystyrene Substrate Soil Less Material for Growth of Crops

2019 ◽  
pp. 151-163 ◽  
Author(s):  
G. N. Kiriro ◽  
I. W. Mwangi ◽  
S. Swaleh ◽  
R. Wanjau ◽  
P. Mbugua ◽  
...  
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Nutrient Release ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Solid Particles ◽  
A Value ◽  
To Come ◽  
The Cost ◽  
Modified Polystyrene ◽  
Nutrient Solutions

Loss of available land for plant growth has made other options that allow an efficient use of water and fertilizers which increase crop quality and productivity. Some systems such as hydroponics need a constant air and fluid circulation as well as nutrient refill that put strain on the cost of production. Without such a system, many growers dump the nutrient solutions at short intervals which affect the environment negatively. Due to such shortcoming, there is a need therefore to come up with a method that will address such challenges. This study reports on the growth of some selected plants on nutrient anchored modified polystyrene material. The material was characterized using FTIR, NMR, FAAS and XPS. Nutrient release parameters were investigated by differential pulse anodic stripping voltammetry at a glassy carbon electrode. Available spaces between the solid particles provided a sufficient supply of air to the plant roots. Mineral release increased with decrease in pH up to a value of 4.0 at which 90% of the nutrient was available for plant uptake. The anchoring of minerals was by complexation whose stability constant was found to be 1.99×1014. This implies that the non biodegradable material has a potential application as a fertilizer and media for plants growth.

scholarly journals Inversvoltammetrische Bestimmung von Metallionen in mit Hilfe von Nährlösungen kultivierten Solanaceen

2003 ◽  
Vol 71 (1) ◽  
pp. 1-8
Author(s):  
D. Riße ◽  
H. Lahl ◽  
B. Unterhalt
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Datura Stramonium ◽  
Anodic Stripping ◽  
Leaves And Roots ◽  
Nutrient Solutions

The uptake of Pb, Cd, Cu, Zn into the leaves and roots of Datura stramonium and Hyoseyamus niger, grown in nutrient solutions, is measured by Differential Pulse Anodic Stripping Voltammetry (DPASV). In the leaves of the plants only the contents of Cd and Zn, not those ofPb and Cu, increase by adding these ions to the medium.

scholarly journals The effect of tamoxifen on the electrochemical behavior of Bi+3/Bi on the glassy carbon electrode and its determination via differential pulse anodic stripping voltammetry

2019 ◽  
Vol 63 (1) ◽  
Author(s):  
Mehdi Jalali ◽  
Zeinab Deris Falahieh ◽  
Mohammad Alimoradi ◽  
Jalal Albadi ◽  
Ali Niazi
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Peak Height ◽  
Carbon Electrode

The electrochemical behavior of Bi+3 ions on the surface of a glassy carbon electrode, in acidic media and in the presence of tamoxifen, was investigated. Cyclic voltammetry, chronoamperometry, differential pulse voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy with energy-dispersive X-ray spectroscopy were used to find the probable mechanism contributing to the reduction of the peak height of bismuth oxidation with an increase in the concentration of tamoxifen. The obtained results show a slight interaction between the bismuth species and tamoxifen which co-deposit on the surface of glassy carbon electrode. Therefore, the reduction in the peak height of bismuth oxidation as a function of tamoxifen concentration was used to develop a new differential pulse anodic striping voltammetry method for determination of trace amount of tamoxifen. The effects of experimental parameters on the in situ DPASV of Bi+3 ions in the presence of tamoxifen shown the optimal conditions as: 2 mol L-1 H2SO4 (1% v v-1 MeOH), a deposition potential of -0.5 V, a deposition time of 60 s, and a glassy carbon electrode rotation rate of 300 rpm. The calibration curve was plotted in the range of 0.5 to 6 µg mL-1 and the limits of detection and quantitation were calculated to be 3.1 × 10-5 µg mL-1 and 1.0 × 10-4 µg mL-1, respectively. The mean, RSD, and relative bias for 0.5 µg mL-1 (n=5) were found to be 0.49 µg mL-1, 0.3%, and 2%, respectively. Finally, the proposed method was successfully used for the determination of tamoxifen in serum and pharmaceutical samples.

scholarly journals Thallium Associated with Manganese Ore Tailings in a Deactivated Mine in the Western Region of Bahia, Brazil

2021 ◽  
Author(s):  
Jorge Luís Santos ◽  
Giuliana Bueno ◽  
Eder Flores ◽  
Oldair Leite ◽  
Clayton Janoni ◽  
...  
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Extraction Procedure ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Rare Metal ◽  
Western Region ◽  
Natural Occurrence ◽  
Flame Atomic Absorption ◽  
The Western Region ◽  
Environmental Agencies

Thallium (Tl) is a rare metal with toxic effects notably harmful to human health and the environment. In this article, the natural occurrence of Tl was evaluated in a deactivated manganese mine located in the Western region of Bahia, Brazil. The extraction procedure with aqua regia was used to dissolve the soil, sediment, and tailings samples. The Tl content was determined by differential pulse anodic stripping voltammetry (DPASV) and manganese (Mn) and iron (Fe) by flame atomic absorption spectroscopy (FAAS). The Tl levels ranged from 0.64 to 473 mg kg‑1, triggering an alert since most of the samples (soil and sediment) analyzed presented Tl concentrations above 1.0 mg kg-1, recognized as the maximum limit recommended by environmental agencies in North America and Europe.

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