Determination of Nitrate-Nitrogen in Water Using a Coated Wire Electrode

Proceedings of the 1989 Georgia Water Resources Conference, May 16-17, 1989, Athens, Georgia.Monitoring nitrate (N0 [3]) in water has important implications to public health and environmental quality. Of the analytical methods available, ion selective electrodes have potential for simple, rapid determination of N0[3] concentrations in water. Use of ion selective electrodes has been limited due to interference by a variety of ions, relatively high detection limits, and short operational lifetimes (Tabatabi and Dick, 1983). According to Langmuir and Jacobson (1970) chloride (Cl) and bicarbonate (HC0[3]) were the chief interfering anions in most waters when using a commercially available liquid junction N0[3] specific electrode. Lee et al (1986) described a procedure for making coated wire nitrate-selective electrodes. In this paper, we report the characteristics of the coated wire N0[3] selective electrode and the possible application to N0[3] analysis in water.Sponsored by U.S. Geological Survey, Georgia Department of Natural Resources, the University of Georgia, Georgia State University, and Georgia Institute of Technology.This book was published by the Institute of Natural Resources, The University of Georgia, Athens, Georgia 30602 with partial funding provided by the U.S. Department of the Interior, Geological Survey, through the Georgia Water Research Institute as authorized by the Water Resources Research Act of 1984 (P.L. 98242). The views and statements advanced in this publication are solely those of the authors and do not represent official views or policies of The University of Georgia or the U.S. Geological Survey or the conference sponsors

Nitrous Oxide and Methane Fluxes from Perturbed and Unperturbed Boreal Forest Sites in Northern Ontario

Boreal forests cover approximately 11% of the terrestrial surface of the world or 14.7 million km2 in the circumpolar region of the northern hemisphere. Of this total, approximately one third of these forests are found in Canada. This accounts for on the order of 50% of the total land area in Canada. A static chamber technique was used to determine the fluxes of nitrous oxide and methane from four Boreal forest sites near Cochrane, Ontario (49°03′N,80°40′W), during the summer of 1992. The four sites included a lowland forest, a drained lowland forest, a clear‐cut and drained lowland forest, as well as an upland forest. The N2O fluxes ranged from an uptake of 7.7 μg(N2O)/m2/hr from a drainage ditch to an emission of 3.1 μg(N2O)/m2/hr from an unvegetated clear‐cut region. The CH4 fluxes ranged from an uptake of 23 μg(CH4)/m2/hr from an upland forest site, to an emission of 2900 μg(CH4)/m2/hr from a drainage ditch. Drainage ditches which contained a large amount of algae exhibited large CH4 production and large N2O uptake