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Anekal, India

HariKrishna S.,Shirdi Sai Engg College
International Journal of ChemTech Research | Year: 2010

Acquatic plants play important roles in balancing water bodies. They are capable of acquiring large quantities of trace elements and heavy metals. The uptake of trace elements is often increased when plants are grown in effluent water containing high levels of macronutrients. Heavy metals enter surface and groundwater in various ways and adversely affect flora and fauna have capacity. The objective of the study is to evaluate the usefulness of different macrophytic species in reducing the nutrient content of the water i.e. to reduce the pollution level of water. Under present investigation Hydrilla vercillata Casp., Elodea (Elodea canadensis Rich); Salvinia sp., have been tested for removal of three important heavy metals Iron (Fe) , Copper(Cu) and Nickel (Ni) from metal solution. These species were grown at 5 mg/L concentrations of Fe , Cu and Ni in single metal solution. These plants have performed extremely well in removing the Fe, Cu, and Ni from their solution and were capable of removing up to 98% of Fe , 95% of Copper and 90 % of Nickel during 10 days dosimetry. Results indicated that at 5 mg/l of heavy metal concentration of Iron, the plant growth was normal and removal efficiency was greater. Removal of Iron for the period of ten days dosimetry was found harmless, without any symptom of toxicity in all the three plants . But in case of Copper and Nickel, all the plants have shown some morphological symptoms of toxicity after 5 days of dosimetry. And Salvinia sp., is capable in improving water quality to the maximum extent by reducing nutrient concentration.

Begum A.,Shirdi Sai Engg College
International Journal of ChemTech Research | Year: 2012

The corrosion inhibitive effects of roasted coffee seed (Coffea Arabica) extract for mild steel in 1 M HCl solution and the influence of potassium iodide additives on the inhibition efficiency was assessed using Mylius thermometric technique at 30,40, 50 and 60 °C temperature. Inhibition efficiency was determined by comparing the corrosion rates in the absence and presence of inhibitor. It was found that the coffee seed extract acts as an inhibitor for acid-induced corrosion of mild steel. In general, at constant sulphuric acid concentration, the inhibition efficiency increases with increase in the inhibitor concentration. Inhibition efficiency of the mild steel decreased with an increase in concentration of the coffee seed extract and with increase in temperature. On the other hand, inhibition efficiency synergistically increased on addition of potassium iodide but decreased with increase in temperature. The adsorption of roasted seeds of the coffee plant onto the mild steel surface was found to obey the Fruendlich adsorption isotherm. Free energy values for adsorption process show that the process is spontaneous1-3.

HariKrishna S.,Shirdi Sai Engg College | Khan I.,Deeksha PU College | Begum A.,PESIT
International Journal of ChemTech Research | Year: 2014

Electrochemical corrosion behavior of mild steel has been investigated, in 1.5 M sulphuric acid and hydrochloric acid solutions containing Amla (Emblica officinalis) leaves aqueous extract as corrosion inhibitor. Experiments were performed by weight loss method for different time intervals and at room temperature. Inhibition efficiency was found to increase with increasing concentration of inhibitor (0.2 g /l to 10 g/l) for 6 hour at room temperature. The maximum inhibition efficiency of Emblica officinalis leaves was 52% in 1N Sulphuric acid and 87% in 1 N Hydrochloric acid respectively. From the comparative studies, it was investigated that the corrosion inhibition efficiency of Emblica officinalis leaves aqueous extract is greater in hydrochloric acid1-3. This may be due to the presence of wide variety of compounds like, tannins, alkaloids and phenols in Emblica officinalis plant. Also, antibacterial activity of Emblica officinalis with 20 mg.ml concentration was studied. In all bacterial strains Escherichia. Coli ATCC 632, Salmonella typhi ATCC 13311, Pseudomonas aeruginosa ATCC 13525, Bacillus cereus ATCC 128263 and Bacillus subtilis ATCC 128263 the zone of inhibition of test microorganisms was recorded as 7.97 ±0.71, 9.70±0.08, 6.77±0.19, 8.70±0.41and 9.87±0.42 mm.

HariKrishna S.,Shirdi Sai Engg College
International Journal of ChemTech Research | Year: 2010

This paper roprts the results of a biomonitoring survey carried out in the urban areas of south Bangalore using the biodiversity of epiphytic lichens as indicator of air pollution . Sampling was performed at four different locations( Koramangala, Madivala Marker, Bannerughatta national Park and Bommasandra industrial area) in April 2009. Lichen species were from palm trees bark of 50-70 cm diameter and at the height of 0.5-0.7 meter. Soil and other extraneous material free, dried unwashed samples of litchens were digested to analyse the Concentrations of heavy metals (Cd, Cr, Cu, Fe, Ni, Pb and Zn). The general order of the concentrations of the heavy metal content was observed to be Bommasandra industrial area> Madivala Market> Koramangala> Bannerughatta national Park. Pyxine meissnerina growing inside the industrial area is most tolerant and has accumulated higher levels of all the heavy metals analyzed The highest total heavy metal contents were found in the Graphis scripta (L.) Ach. in Kramangala. The highest total heavy metal contents were found in the Chrysothrix candelaris (L.) in Madivala The highest total heavy metal contents were found in the Foraminella ambigua in Bommasandra. The highest total heavy metal Iron was found in the Chrysothrix candelaris (L.) in Bannerughatta National park. The sensitivity of lichens to polluted air and their ability to accumulate heavy metals and retain them for a long period in their thalli has become a beneficial tool in biomonitoring of various heavy metal pollutants.

Krishna H.,Shirdi Sai Engg College
International Journal of ChemTech Research | Year: 2010

Lakes in any urban region are ecological security zones and true indicators of sustainable urban development. Tanks and lakes are a very important aspect of water supply for drinking and irrigation. The world's fragile and dwindling fresh water resources and over-burdened sanitation systems, leading to environmental degradation is attributed to Rapid urbanization. In this study the differential accumulation of heavy metals (Fe, Zn, Cr, Cu, Pb, Ni, Cd) among coconut trees irrigated with three different lakes water (Bellandur lake, Madivala lake and Sankey tank) from Bangalore was investigated. The heavy metal concentration for the experimented lakes was of the order for:- soil and water sample Bellandur lake (Cr > Cu> Ni> Pb> Cd> Fe) > Madivala Lake (Zn > Ni > Cr > Cd > Fe >Cu> Pb) >Sankey tank, (Zn > Cr > Ni > Cd > Cu>Fe > Pb). Coconut water; Bellandur lake (Fe > Ni > Cr > Cu > Pb > Zn> Cd)> Madivala Lake (Fe > Cr > Cu > Pb > Zn >Cd) > Sankey tank, (Fe > Cu > Pb > Zn > Ni). Coconut leaf extract; Bellandur lake (Fe > Cr > Ni> Zn > Cu > Pb > Cd) > Madivala Lake (Fe > Cr > Zn > Cu > Pb > Cd > Ni) > Sankey tank, (Fe > Cu > Zn > Pb > Ni> Cd). Coconut root extract; Bellandur lake (Fe > Cr > Ni> Zn > Cu > Pb > Cd) > Madivala Lake (Fe > Cr > Zn > Cu > Pb > Cd > Ni) > Sankey tank, (Fe > Cu > Zn > Pb > Ni> Cd). The maximum accumulated concentration of metals such as iron, Chromium, nickel and copper in coconut root and leaf extract was 100,47.9, 30.8 and 24.5 mg/l; 122.6, 36.9,28.6 and 21.6 mg/l respectively. Coconut water contained 7.6 mg/l of iron, 4.5 mg/l of Zinc; 5.7 mg/l of chromium and 3.5 mg/l of cadmium. The trace metal concentration was maximum in all the tested samples of Bellandur Lake when compared to the other two lakes.

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