Fertilizers. Chemical analysis. Determination of nitrogen-Method for determination of ammoniacal nitrogen content in the presence of other substances which release ammonia when treated with sodium hydroxide (titrimetric method)
肥料 化学分析 氮的测定 在氢氧化钠处理时释放氨的其他物质存在的情况下测定氨氮含量的方法(滴定法)