published in Advance ACS Absrracrs, December I S , 1993. 0022-3654/94/2098-055 1504.50/0 Experimental Section Materials. The following reagent grade chemicals were used without further purification: sodium bromide, thiourea, perchloric acid (60%), sodium bromide, sodium perchlorate (Fisher), bromine, silver nitrate, sodium bromate, and sodium hydroxide (Aldrich). Neither of the major reactants-...

non-point pollution are an important factor in determining water quality and eutrophication of fresh water. the principle causes of this issue is high concentrations of nutrients in the water especially nitrogen and phosphorus. change of land use particularly affected on water nitrate load. therefore, understanding the correlations between land use and nitrate pollutant is a priority in order t...

Background: This research aims to measure and study spatial changes, and the reason behind the increasing nitrate content in water wells in the Central District of Khodabandeh County in the Zanjan Province. Methods: The nitrate and nitrite content, electrical conductivity, dissolved oxygen, temperature, total hardness and pH were measured at 40 sampling stations in the study area. The obtained...

Nitrate, an essential nutrient for primary production in natural waters, is optically detectable the ultraviolet spectral region of 217–240 nm, with no chemical reagents required. Optical nitrate sensors allow monitoring at high temporal and spatial resolutions that are difficult to achieve traditional approaches involving collection discrete water samples followed by wet-chemical laboratory an...

Using a-tetralone, as starting material, a series of phencyclidine analogues were synthesized. This ketone was reacted separately with ethylmagnesium bromide, P-methoxyphenylmagnesium bromide and P-methylphenylmagnesium bromide. The resultant alcohols were treated with a suspension of NaN3 and CCl3COOH in CHCl3. The azides were subsequently...