First Order Derivative Spectrophotometric Determination of Thorium in Geological Samples Using Diacetylmonoxine ρ-hydroxybenzoylhydrazone

A simple, selective and sensitive spectrophotometric method has been developed for the determination of trace amounts of thorium using a newly synthesised reagent diacetylmonoximep-hydroxybenzoylhydrazone (DMPHBH) in the presence of Triton X-100. The molar absorptivity and Sandell’s sensitivity of the coloured species at pH 4.4 were found to be 4.20 x 104 L mol-1 cm-1 and 5.5 ng cm-2, respectively. Beer’s law is obeyed in the range 0.35 -3.8 g mL-1 of thorium(IV) at 410 nm. The stoichiometry of the complex was found to be 1:2 (Th(IV): DMPHBH). A highly selective first order derivative spectrophotometric method for the determination of thorium in the presence of uranium is also reported. The detection limit and quantitation limit of first order derivative spectrophotometry were found to be 0.03 and 0.11 g mL-1, respectively. The developed procedure has been successfully applied for the trace level determination of thorium in rock samples and synthetic mixtures

Community Involvement in Tourism Development: A Case Study of Lenggong Valley World Heritage Site

This paper examines the empirical relationship between the economic impact and community involvement in the Lenggong Valley. Recommendations for improvement in development effectiveness through the development of a community centre for economic and social activities, with specific attention given to types of activity and community involvement stimulating the economic development in the Lenggong Valley. Heritage tourism development is a tourism in which arts, culture and heritage form a key attraction for visitors and it can be represented as an area of significant economic benefit to heritage sites. The tourism industry in Hulu Perak became more widespread after Lenggong Valley is recognized as a World Heritage Site. There is shown a positive effect on the development and economic prosperity

Consciousness towards Socio-Economic Impact Propensity: The Langkawi Island

This study evaluates the socio-economic impact of tourism development on the tourist perceptions in Oriental Village, Langkawi Island. Socio-economic impacts are the consequences of either the tourism industry development or the presence of tourists in a particular destination, which resulted from the host-tourist relationship. Data for this research was generated using quantitative techniques and divided into 3 parts of instruments. Part A includes the demographic profile of respondents, Part B contains perceptions and opinions in economic and social impatcs and the last part was Part C where consists tourism utility assessment in social, economy and transportation. Simple frequency of mean and paired sample -test analysis were used to analyse the data generated for the study. The findings of the analysis proved that tourism development had a significant effect on the socio-economic impact and on the tourists’ perceptions in Oriental Village, Langkawi Island. In addition, it is viewed that public participation must be encouraged by tourism developers and planners to ensure the sustainability of tourism development in the community. Thus, this paper aims to give emphasis on the establishment of standard social guidelines within the tourism development framework for the purpose of preserving and protecting the social and economic values

In vitro cytokine response to tuberculosis

The outcome of any infectious disease is mainly dependent upon the interplay of the cytokines. These cytokines are grouped into two: Type land Type 2 cytokines secreted by Th1 and Th2 cells that contribute to the pro-inflammatory and anti-inflammatory responses respectively

Study on neuro ophthalmic manifestations of brain tumor

INTRODUCTION: Tumors of CNS represent a unique heterogenous population of both benign and malignant neoplasm. Primary brain tumors constitute 2% of all cancers in Adults and 20% of all malignant tumors in children. Brain tumors are second to leukemias in children to comprise a large group of solid tumors The incidence of primary tumors is 10-17 per 1,00,000 per year. Since the visual pathway extends from the frontal lobe anteriorly to the occipital lobe posteriorly any insult to the brain in the form of trauma, tumor, congenital defects can involve visual pathway which is reflected externally and detected by the ophthalmologist. In developing countries like ours where expensive investigations like CT / MRI are yet to be of wide spread use a careful neuro ophthalmic evaluation can diagnose neurological disorder with a fair amount of accuracy. Morethan 50% of the intracranial tumors first produce ocular signs and symptoms and hence are first detected by an ophthalmologist. So Ophthalmologists play an important role in diagnosis and management of these patients. AIM OF THE STUDY: To study the value of ocular signs in predicting the presence of an intracranial tumor. To correlate the ocular symptoms and signs with the location of the brain tumor. MATERIALS AND METHODS: The study was conducted in the Department of ophthalmololgy, Government Rajaji Hospital, Madurai. The period of study was between January 2006 to August 2007. The total of sixty patients with signs and symptoms suggestive of brain tumor were examined and then referred to neuro surgery department, GRH and followed up. Also the patients referred from neuro surgery department to our department were also included in the study. INCLUSION CRITERIA : Patients who had typical CT scan findings of a brain tumor were included. Patients with signs and symptoms suggestive of brain tumor but whose CT was normal were excluded. Patients with SOL which were diagnosed as an abcess / tuberculoma / cysticercosis were also excluded (confirmed by neuro surgery department). CONCLUSION: Of the 60 patients studied, 30-50 age group was commonly affected. Male predilection noted. Pathologically the commonest tumor was Glioma. Headache was the commonest non localizing symptom. Papilledema was the commonest ophthalmic sign particularly in CP angle tumors. Patients with Sellar / parasellar tumors (Pituitary adenoma and craniopharyngioma) presented with endocrine complaints with a characteristic visual field defect. CP angle tumor manifested with sixth nerve palsy along with seventh and eighth nerve lesion with papilledema. The ocular signs and symptoms helped in localizing the site of the tumor. Ophthalmologists by and large play a major role in early diagnosis of the brain tumors, so with ocular findings as the best clinical tool and aided by radio imaging techniques, the brain tumors can be virtually fished out and the patient given early treatment thereby preventing further morbidity and mortality

Equilibrium, Thermodynamic, and Kinetic Studies

Publisher Copyright: © 2022 Razia Sulthana et al.The economic viability of adsorbing crystal violet (CV) using pepper seed spent (PSS) as a biosorbent in an aqueous solution has been studied. A parametrical investigation was conducted considering parameters like initial concentration of dye, time of contact, pH value, and temperature variation. The analysis of experimental data obtained was carried out by evaluating with the isotherms of Freundlich, Sips, Tempkin, Jovanovic, Brouers-Sotolongo, Toth, Vieth-Sladek, Radke-Prausnitz, Langmuir, and Redlich-Peterson. The adsorption kinetics were studied by implementing the Dumwald-Wagner, Weber-Morris, pseudo-first-order, pseudo-second-order, film diffusion, and Avrami models. The experimental value of adsorption capacity (Qm=129.4 mg g-1) was observed to be quite close to the Jovanovic isotherm adsorption capacity (Qm=82.24 mg g-1) at (R2), coefficient of correlation of 0.945. The data validation was found to conform to that of pseudo-second-order and Avrami kinetic models. The adsorption process was specified as a spontaneous and endothermic process owing to the thermodynamic parametrical values of ΔG0, ΔH0, and ΔS0. The value of ΔH0 is an indicator of the process's physical nature. The adsorption of CV to the PSS was authenticated from infrared spectroscopy and scanning electron microscopy images. The interactions of the CV-PSS system have been discussed, and the observations noted suggest PSS as a feasible adsorbent to extract CV from an aqueous solution.publishersversionpublishe

Diacetylmonoxime-(<i style="">p</i>-anisyl)-thiosemicarbazone as a new chromogenic reagent for determination of thallium

470-475A simple and sensitive derivative spectrophotometric method has been developed for the determination of thallium(III) using a newly synthesized reagent diacetylmonoxime-(p-anisyl)-thiosemicarbazone in acetic acid medium. The molar absorptivity and Sandell’s sensitivity of the coloured species are 5.6104 L mol-1 cm-1 and 3.6 ng cm-2, respectively. Beer’s law is obeyed between 0.25 and 2.60 g mL-1 of Tl(III) at 460 nm. The stoichiometry of the complex was found to be 1:2 (metal: ligand). Calibration graphs were derived by measuring first order derivative amplitudes at 425 and 505 nm. The metal ions like Cu(II), Cd(II), Pb(II), Zn(II) and Bi(III) which are usually associated with thallium containing samples do not interfere. The developed procedure has been successfully applied for the trace level determination of thallium in minerals, alloys, urine, soil and water samples

Highly selective derivative spectrophotometric determination of palladium(II) in hydrogenation catalysts and alloy samples

177-182A simple, selective and sensitive derivative spectrophotometric method has been developed for the determination of palladium(II) using a newly synthesised reagent diacetylmonoxime-(p-anisyl)-thiosemicarbazone in acetic acid medium. The molar absorptivity and Sandell’s sensitivity of the coloured species are 3.8 × 104 L mol-1 cm-1 and 2.8 ng cm-2, respectively. Beer’s law is obeyed between 0.2-2.0 g mL-1 of Pd(II) at 440 nm. The stoichiometry of the complex is found to be 1:2 (metal:ligand). Calibration graph for the first order derivative spectrophotometric determination of palladium(II) is derived by measuring derivative amplitudes at 480 nm with a linear range 0.15-2.6 mg L-1. The metal ions, which are normally associated with palladium in mineral and alloy samples, do not interfere. The proposed method has been successfully applied for the trace level determination of palladium in hydrogenation catalysts and some synthetic mixtures