煤和土壤中氮的测定,目前用的克氏蒸馏法较为繁琐费时,本文以硫酸铜作催化剂,样品经硫磷混酸消化,再以氢氧化钠和碳酸钠中和并使铜、铁沉淀,分取清液加入 EDTA 和氢氧化钠调节 pH 大于11.5,用气敏氨电极测定,本方法简便、快速,经大批样品测试结果与蒸馏法结果一致。 Coal and soil nitrogen determination, the current use of Krypton distillation method is more complicated and time-consuming, copper sulfate in this paper as a catalyst, the sample digested by phosphoric acid and phosphoric acid, and then sodium hydroxide and sodium carbonate and copper, iron precipitation, The supernatant was added with EDTA and sodium hydroxide to adjust the pH to be greater than 11.5. The method was simple and rapid with gas-sensing ammonia electrode. The result of the batch test was consistent with the result of distillation.