This report summarizes the major modifications to the Kjeldahl method and discusses the applicability of the method to compounds found in oil shale wastewaters. The Kjeldahl method was evaluated for the recovery of nitrogen from individual N-containing reference compounds, total nitrogen in 10 oil shale wastewaters, and organic nitrogen in 10 oil shale wastewaters. The Kjeldahl method was found to give quantitative recovery of nitrogen for only 3 of 17 compounds tested. The precision of the method for both total Kjeldahl nitrogen and organic Kjeldahl nitrogen was excellent; the rsd values were below 5%. The accuracy of the method for organic nitrogen was difficult to assess, however, because there is currently no available means of validating, organic nitrogen values for these wastewaters. The recovery of TKN from these wastewater samples was within 5% of the total nitrogen values obtained by a method that we are currently evaluating that uses combustion/ chemiluminescence.