Crystal structure of N-[(morpholin-4-yl)(thio-phen-2-yl)meth-yl]benzamide.

In the title compound, C16H18N2O2S, the morpholine ring adopts a chair conformation. The thio-phene ring makes a dihedral angle of 63.54 (14)° with the mean plane of the four C atoms [maximum deviation = 0.010 (3) Å] of the morpholine ring. The benzamide ring is disordered, with four C atoms occupying two sets of sites, with a refined occupancy ratio of 0.502 (4):0.498 (4). These two rings are inclined to one another by 85.2 (4)° and to the thio-phene ring by 72.7 (3) and 13.0 (3)° for the major and minor components, respectively. In the crystal, mol-ecules are linked via N-H⋯O hydrogen bonds, forming chains along [001].

Monitoring the quality of groundwater on the bank of Uyyakondan channel of river Cauvery at Tiruchirappalli, Tamil Nadu-India.

The groundwater quality on the banks of Uyyakondan channel of Cauvery at Tiruchirappalli was studied. Two groundwater samples were taken near the bank of the channel on both sides and the other two samples were taken nearly 0.5 km away from the channel at ten stations. The study was carried out every year over a period of 3 years from December 2001-December 2003. The samples were subjected to physico-chemical analysis. The results showed that most of the physico-chemical parameters were in higher concentrations at most of the groundwater stations.

Risk assessment of physico-chemical contaminants in groundwater of Pettavaithalai area, Tiruchirappalli, Tamilnadu - India.

A study was carried out in Pettavaithalai area to evaluate the current status of physico-chemical contaminants and their sources in groundwater. Groundwater samples collected from pettavaithalai area in 15 different stations were analyzed every alternative months over a period of two years from August 2000 to June 2002. A sugar mill is situated at the heart of the study area. Three profiles (profile A, B and C) were selected based on the direction in which the sugar mill effluent flows. In each profile five samples were collected from five different station at a regular distance of about 1 Km. The physico-chemical parameters such as pH, EC TDS, TH, NO3, SO4, PO4, Na, K, Ca, Mg, DO, BOD and COD have been analyzed. The results showed that among the three profiles, many of the estimated physico-chemical parameters of profile C were very high when compared to profile B and A which indicates the poor quality of the groundwater around this area.

Evaluation of drinking water quality in Tiruchirapalli, Tamil Nadu.

To evaluate the quality of drinking water in and around Tiruchirappalli City, twenty spots were identified within a radius of about 20 km. In all places ground water is used for drinking and domestic purposes. Nearly twenty physicochemical parameters were studied and the results have been presented. All the water bodies are found to contain high level of inorganic salts and total hardness with high electrical conductance. Since they are unsuitable for drinking purposes, method to improve the water quality has been suggested.