Determination of the X-ray and K-capture intensities in the decay of 153 Gd

Vasanthacharya

Formerly: Proceedings (Chemical Sciences)

1986

Magnetic susceptibility studies of lead oxyhalide glasses containing high concentrations of transition metal oxides such as MnO and Fe203 have been performed. While they exhibit predominantly antiferromagnetir interactions, the low temperature (< 100K) region is dominated by paramagnetic contributions. The behaviour in these glasses is found to be similar to that of covalent oxide glasses and is different from that of purely ionic sulphate glasses.

Section: Introductionmentioning

confidence: 98%

“…Lead oxyhalide glasses in the systems, PbO-PbF2 and PbO-PbCI2 can be prepared with high concentrations of transition metal (TM) ions such as Fe203 and MnO (Rao and Rao 1985a). We have earlier investigated these glasses containing a'u ions by ESR and optical spectroscopies Rao 1985a, 1985b).…”

Section: Introductionmentioning

confidence: 99%

Magnetic susceptibility studies of lead oxyhalide glasses containing transition metal oxides

Vasanthacharya

Formerly: Proceedings (Chemical Sciences)

1986

“…Green leafy vegetables are the cheapest of all the vegetables within the reach of poor man, being richest in their nutritional value and also the medicinal values of greens are good for health, increase the blood level, clear vision, to cure sore in the stomach and mouth, prevent the jaundice, cure the heart diseases, release the knees pain, sugar disorder and the greens are good food for children and give essential nutrient for pregnant women (Rao et al, 1980, Kuhnlein, 1996, Saxena, 1999. Based on the advantages of green leafy vegetables for healthcare, this study is attempted to document the greens used by villagers of Namakkal districts and studied with systematic for their nutrition for their medicinal value.…”

Section: Introductionmentioning

confidence: 99%

Biosystematics Studies on the Greens Used by Local Inhabitants of Pothamalai Hills in, Namakkal District, Tamil Nadu, India

Sathiyaraj

Kumuthakalavalli

2014

ILNS

The present study mainly focuses on the ethno-botanical importance of greens, used by the Pothamalai, Puduppatti, Vadugam, Malaiyampatti, Seerappalli and Rasipuram local people in Namakkal districts. From this investigation 25 species of green belonging to19 genera and 13 families are recorded. This information regarding on correct botanical identity with family, vernacular name, systematic description and medicinal uses was observed. During the survey brought out some popular medicinal plants frequently used by the local villagers for minor ailments such as felt by the respondents were greens are good for health, increase the blood level, clear vision, to cure sore in the stomach and mouth, prevent the jaundice, cure the heart diseases, release the knees pain, and sugar disorder. The greens are good food for children and give essential nutrient for pregnant women.

“…6,7 Thus, the direct determination of NH2OH is difficult in environmental water because of its low concentration and instability. 8 Several methods, such as spectrophotometric methods 6,9-11 and a titrimetric method 12 for the determination of NH2OH, have been reported. The former method is based on the combination of the oxidation of NH2OH to nitrite with iodine and the usual Griess-Romijin method.…”

Section: Introductionmentioning

confidence: 99%

A Simple and Sensitive Method for the Determination of Hydroxylamine in Fresh-Water Samples Using Hypochlorite Followed by Gas Chromatography

et al. 2004

Nitrogenous species, such as ammonia, nitrite, nitrate, hydroxylamine (NH2OH) and nitrous oxide (N2O), are recycling through microbial processes in the hydrosphere.1-3 NH2OH has been identified as an intermediate in the nitrogen cycles, such as the oxidation of ammonia to nitrite and the reduction of nitrite to ammonia by several microorganisms in aquatic and sedimentary systems. 4,5 Furthermore, NH2OH is often described as an intermediate for producing N2O. N2O is one of the greenhouse gases, and is also associated with the reduction of ozone in the stratosphere. Hence, NH2OH is an important nitrogen species not only for understanding the nitrogen cycle, but also for clarifying the mechanism of N2O production.It has been reported that millimolar solutions of NH2OH are stable for several hours at pH 4.0, but only for 60 min at pH 7.8 in the presence of air. 6,7 Thus, the direct determination of NH2OH is difficult in environmental water because of its low concentration and instability. Several methods, such as spectrophotometric methods 6,9-11 and a titrimetric method 12 for the determination of NH2OH, have been reported. The former method is based on the combination of the oxidation of NH2OH to nitrite with iodine and the usual Griess-Romijin method. This method, however, is subject to interference from nitrite. 13The latter method is based on the oxidation of NH2OH using ferric ammonium sulfate with a copper sulfate catalyst. In this method, Fe(III) was reduced by NH2OH and the resultant Fe(II) was titrated with potassium dichromate. This method is applicable in the millimolar range. In general, these methods were employed only in media containing a relatively high concentration of NH2OH. On the other hand, Marta et al. developed a gas chromatographic method for the determination of nanomolar concentrations of NH2OH by its oxidation to N2O using Fe(III) ions.14 However, the yield for the conversion of NH2OH to N2O by this method was 50%.In a previous paper, 13 we reported the spectrophotometric determination for NH2OH in environmental water samples. The interference from nitrite in the water sample described above was solved by removing the resultant azo dye from nitrite using a Sep-Pak C18 cartridge prior to the analysis of NH2OH. Although this method was available for environmental water samples from fresh-water to seawater, the procedure was very tedious. In this paper, we propose a new and simple method for the determination of nanomolar NH2OH in fresh-water samples by its oxidation to nitrous oxide using hypochlorite as an oxidizing agent. The N2O produced in this manner was subsequently measured by using a gas chromatograph with an electron-capture detector (ECD). Experimental Reagent and apparatusReagent solutions were prepared with high-purity water from a Millipore Milli-Q purification system. A standard NH2OH solution (500 mgN L -1 ) was prepared by dissolving 0.2481 g of hydroxylammonium chloride in 100 mL of water deoxidated with nitrogen gas. It was fleshly prepared for each analysis. A hypochlorit...