Browsing by Author "Anamika Tripathi"

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Airborne lead pollution in the city of Varanasi, India
(1994) Anamika Tripathi
Monitoring of lead in ambient air was undertaken in the city of Varanasi, India, over a period of 2 yr from January 1988 to December 1989. Air samples were collected from 10 sampling sites and analysed by the Atomic Absorption Spectrometry method. Lead levels in India are found to be low compared to western countries. The highest concentration of Pb was recorded at Andhra Pul, a busy crossing in the city and lowest at Sarnath, i.e. about 10 km away from the city centre. The experimental results obtained, show that the automobile emission is the predominant source for lead pollution in the city. The concentrations follow a log-normal distribution at most of the sites. © 1994.
Atmospheric dustfall deposits in Varanasi City
(1991) B.D. Tripathi; Anamika Tripathi; Kiran Misra
Monthly variations in dustfall concentration was studied in the city of Varanasi, India, during 1988. For dustfall samples collection, special dustfall jars were set up at three different sites at a height of approximately 20 m above the ground in and outside the city. Collected dust deposits were chemically analysed and the results are briefly discussed. A comparison was made between these sites and concluded that the maximum concentration was found at Parav and the minimum at Banaras Hindu University. In addition, water soluble and water insoluble fractions were detected in dust deposits. A seasonal variation in concentrations was also observed. © 1991.
Foliar injury and leaf diffusive resistance of rice and white bean in response to SO2 and O3, singly and in combination
(1992) B.D. Tripathi; Anamika Tripathi
Plants of rice (Oryza sativa) and white bean (Phaseolus vulgaris) were exposed to 524 μg m-3 SO2, 392 μg m-3 O3 and a mixture of both gases, i.e. 524 μg m-3 SO2 and 392 μg m-3 O3 to determine the visible foliar injury and leaf diffusive resistance. Response of leaf diffusive resistance was measured on upper and lower surfaces of leaves, i.e. the two unifoliate leaves of bean and the first, second and third primary leaves of rice. The difference in the response may be due to sensitive guard cells causing stomatal closure in the presence of O3, whilst a low concentration of SO2 caused the stomata to open. Thus, SO2 alone is known to decrease, and O3 tends to increase leaf diffusive resistance. However, exposure to both gases increases or decreases the resistance, depending on the species response. © 1992.
Impact of electronic waste pollutants on underground water
(wiley, 2021) Juhi Khan; Amrish Kumar; Ajay Giri; Dan Bahadur Pal; Anamika Tripathi; Deen Dayal Giri
Electronic waste (e-waste) consists of discarded, obsolete, or broken electrical and electronic devices. These devices utilize electricity in their function state, e.g. computer monitors, keyboards, printers, CPU (central processing unit), typewriters, cell phones, chargers, remotes, compact discs, headphones, batteries, television, etc. This electronic equipment contains several inorganic metals such as heavy metals, chromium, mercury, lead, cadmium, barium, arsenic, etc. These metals are released into the environment when we discard the old, unused equipment. In addition to heavy metals, this electrical equipment also contains organic components that are released during informal and illegal recycling of e-waste pollutants into the terrestrial and aquatic habitats. The pollutants enter the surface water and percolate to the groundwater. The present chapter briefly discusses major inorganic and organic pollutants present in e-waste, their entry into the environment, and evaluates their genotoxic and mutagenic effect, as well as possible effects on organisms and human. © 2021 John Wiley & Sons Ltd. All rights reserved.
Influence of industrial wastes on physico-chemical properties of soil and germination and mineral composition of wheat
(Kluwer Academic Publishers, 1990) B.D. Tripathi; R.K. Dwivedi; Anamika Tripathi
The effect of chemical effluents discharged from a chemical and fertilizer factory on physicochemical properties of soil and germination and mineral composition of wheat was studied at Varanasi, India. Forty times higher concentration of Na was observed in the effluent than that of the nearby well water. It showed a positive (significant) correlation with Na and a negative (significant) with K and Ca of the soil. Cation exchange capacity (CEC), porosity and water holding capacity were reduced by effluent affected soil. the germination percentage of wheat was negatively correlated with the Na of effluent and Na+Mg/Ca of the soil. A significant (positive) correlation existed between Na of effluent and Na content of the plants. Calcium percentage on the other hand, exhibited a reverse trend. © 1990 Kluwer Academic Publishers.
Phytomonitoring and NO(x) pollution around silver refineries
(Elsevier Science Ltd, 1999) Anamika Tripathi; D.S. Tripathi; Vishnu Prakash
In order to assess the impact of NO(x) pollution on vegetation around silver refineries, the present study was undertaken in Varanasi, India, during the period January to December 1994. For this purpose, the five most common plants at all sites, Ficus religeosa, Syzium jambolana, Azadirachta indica, Cassia fistula, and Mangifera indica, were selected as test plants. Five study sites were selected around silver refineries. A control site, BHU, was also selected outside the city in the northern direction at a distance of about 10 km. Responses to nitrogen oxides of plants, such as foliar injury symptoms, changes in chlorophyll, carotenoids, sugar, ascorbic acid, protein, and nitrogen content were measured. The NO(x) concentrations were high in the immediate vicinity of the silver refineries. There also exists a positive and significant relationship between the concentrations of NO(x) and foliar injury, protein, and nitrogen content in plants. The levels of foliar injury, chlorophyll, carotenoid, sugar, and ascorbic acid were found to decrease, and the amounts of protein and nitrogen were found to increase in comparison to plants growing at a control site. The magnitude of such changes was greatest in F. religeosa. The study suggests that the differential sensitivity of plants to NO(x) may be used in evaluating the air pollution impact around emission sources, and M. indica plants can be used as an indicator plant for quantifying the biological changes.; In order to assess the impact of NOx pollution on vegetation around silver refineries, the present study was undertaken in Varanasi, India, during the period January to December 1994. For this purpose, the five most common plants at all sites, Ficus religeosa, Syzium jambolana, Azadirachta indica, Cassia fistula, and Mangifera indica, were selected as test plants. Five study sites were selected around silver refineries. A control site, BHU, was also selected outside the city in the northern direction at a distance of about 10 km. Responses to nitrogen oxides of plants, such as foliar injury symptoms, changes in chlorophyll, carotenoids, sugar, ascorbic acid, protein, and nitrogen content were measured. The NOx concentrations were high in the immediate vicinity of the silver refineries. There also exists a positive and significant relationship between the concentrations of NOx and foliar injury, protein, and nitrogen content in plants. The levels of foliar injury, chlorophyll, carotenoid, sugar, and ascorbic acid were found to decrease, and the amounts of protein and nitrogen were found to increase in comparison to plants growing at a control site. The magnitude of such changes was greatest in F. religeosa. The study suggests that the differential sensitivity of plants to NOx may be used in evaluating the air pollution impact around emission sources, and M. indica plants can be used as an indicator plant for quantifying the biological changes.
Plant Competition and Its Course Through Time
(1996) Aradhana Bajpai; Anamika Tripathi; D.N. Tewari; M.K. Singh; D.K. Singh; V. Prakash
[No abstract available]