Abstract
The concentrations and isotopic compositions of the various forms of nitrogen in silty clay sediments from the Bay of Quinte (Lake Ontario) have been determined. The total organic-N content is high throughout the sediment profiles and generally decreases with depth. On the contrary, exchangeable NH + 4-N concentration is quite low and tends to increase with depth in two out of three sediment cores examined. The concentration of non-exchangeable NH + 4-N and the 6 N HCl hydrolyzable NH + 4-N are relatively constant with depth. Among the N fractions analyzed, the exchangeable NH + 4-is most enriched in 15N. In most cases, the δ 15 N values of the N fractions remain relatively constant with sediment depth. There is no apparent correlation of δ 15 N values with the N concentration for any of the individual N fractions. The observed ranges in the δ 15 N values are: exchangeable NH + 4, + 5–+10‰; 6 N HCl hydrolyzable total N and 6 N HCl hydrolyzable NH + 4-N, + 3.5–+5.5‰.
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