caa a22 4500 463220714 CHVBK 20180405153211.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1134/S1061934807110068 doi (NATIONALLICENCE)springer-10.1134/S1061934807110068 Spectrophotometric determination of tellurium(IV) in environmental and telluride film samples [Elektronische Daten] [K. Suvardhan, P. Krishna, E. Puttaiah, P. Chiranjeevi] Three simple, rapid, and sensitive spectrophotometric methods for the determination of traces and ultratraces of tellurium(IV) were studied. These methods were based on either the oxidation of 4-bromophenylhydrazine (4-BPH) by tellurium in a basic medium and coupling with N-(1-naphthyl)ethylenediamine dihydrochloride (NEDA) to give a purple-colored product, the oxidation of 3-methyl-2-benzothazoline hydrazone hydrochloride (MBTH) by tellurium in a basic medium and coupling with chromotropic acid (CA) to yield a red-colored species, or the oxidation of 2,3-dimethoxystrychnidin-10-one (2,3-DMSO) by tellurium in an acidic medium to yield an orange-colored derivative. Beer's law was obeyed in the range 1.0-25 μg/mL (purple-colored product), 0.7-20 μg/mL (red-colored species), and 0.3-15 μg/mL (orange-colored derivative). The reaction conditions and other analytical parameters were investigated to enhance the sensitivity of the proposed methods. The tolerance limit of various ions has been studied. The methods were applied to the analysis of tellurium in water samples (waste, river, lake, and spring), plant materials, soil samples, and telluride thin films. The results obtained were superior to those obtained using the reported method. The performances of the proposed methods were evaluated in terms of ‘t'-test and variance ratio ‘f'-test, which indicate the advances of the proposed methods over reported methods. Pleiades Publishing, Ltd., 2007 Suvardhan K. Environmental Monitoring Laboratories, Department of Chemistry, Sri Venkateswara University, 517502, Tirupati, India aut Krishna P. Environmental Monitoring Laboratories, Department of Chemistry, Sri Venkateswara University, 517502, Tirupati, India aut Puttaiah E. Department of Environmental Sciences, Kuvempu University, 577451, Sankaragatta, Karnataka, India aut Chiranjeevi P. Environmental Monitoring Laboratories, Department of Chemistry, Sri Venkateswara University, 517502, Tirupati, India aut Journal of Analytical Chemistry Nauka/Interperiodica 62/11(2007-11-01), 1032-1039 1061-9348 62:11<1032 2007 62 10809 https://doi.org/10.1134/S1061934807110068 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061934807110068 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Suvardhan K. Environmental Monitoring Laboratories, Department of Chemistry, Sri Venkateswara University, 517502, Tirupati, India aut NATIONALLICENCE 700 1- Krishna P. Environmental Monitoring Laboratories, Department of Chemistry, Sri Venkateswara University, 517502, Tirupati, India aut NATIONALLICENCE 700 1- Puttaiah E. Department of Environmental Sciences, Kuvempu University, 577451, Sankaragatta, Karnataka, India aut NATIONALLICENCE 700 1- Chiranjeevi P. Environmental Monitoring Laboratories, Department of Chemistry, Sri Venkateswara University, 517502, Tirupati, India aut NATIONALLICENCE 773 0- Journal of Analytical Chemistry Nauka/Interperiodica 62/11(2007-11-01), 1032-1039 1061-9348 62:11<1032 2007 62 10809 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer