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称取2克经研磨的样品,置于250毫升量瓶中,加入50毫升盐酸溶液(1%),剧烈振荡5分钟。加去离子水定容,沉清或过滤后取清液10毫升移入100毫升量瓶中,加2毫升酒石酸溶液(10%)和2毫升氢氧化钠溶液(40%),用去离子水定容,全部倒入100毫升塑料烧杯中,插入502型氨气敏电极(江苏电分析仪器厂出品),在搅拌下待电位稳定后,读取电位值E_1(毫伏),立即在该液中准确加入1M NH,CI溶液1毫升,待达到电位平衡后,读取电位值E_2(毫伏)。按一次标准添加公式计算。
Weigh 2 grams of the milled sample, placed in a 250 ml volumetric flask, add 50 ml of hydrochloric acid solution (1%) and shake vigorously for 5 minutes. Add deionized water and put it in a 100 ml volumetric flask. Add 2 ml of tartaric acid solution (10%) and 2 ml of sodium hydroxide solution (40%), deionized water Pour into a 100 ml plastic beaker and insert a type 502 ammonia gas sensor (produced by Jiangsu Electric Analytical Instrument Factory). After the potential is stabilized under stirring, read the potential value E_1 (millivolts), immediately in the liquid Accurately added 1M NH, CI solution 1 ml until the potential equilibrium, read the potential value E_2 (millivolts). Press once to add formula to calculate.