CAJ | 학술논문

研究了聚四氟乙烯管编结反应器(KR)在线吸附预富集技术与冷蒸气原子荧光联用测定矿泉水中痕量无机汞的方法.Hg2+与DDTC在线形成Hg2+-DDTC络合物并吸附在KR内壁上,采用电磁感应加热技术,用20% (V/V) HNO3在线加热洗脱并氧化预富集于KR内壁上的Hg2+-DDTC.洗脱液与KBH4溶液反应生成蒸气态汞,直接用冷蒸气原子荧光联用技术检测.20%(V/V)HNO3作为洗脱液的同时也为氢化发生提供了酸性介质.本方法未使用常用的有机洗脱液,具有操作简单和环保等优点.每小时可分析30个样品,最大吸附倍数为35倍,样品分析精密度RSD为2.2%(n=11),检出限(3σ)为2.0 ng/L.
연구료취사불을희관편결반응기(KR)재선흡부예부집기술여랭증기원자형광련용측정광천수중흔량무궤홍적방법.Hg2+여DDTC재선형성Hg2+-DDTC락합물병흡부재KR내벽상,채용전자감응가열기술,용20% (V/V) HNO3재선가열세탈병양화예부집우KR내벽상적Hg2+-DDTC.세탈액여KBH4용액반응생성증기태홍,직접용랭증기원자형광련용기술검측.20%(V/V)HNO3작위세탈액적동시야위경화발생제공료산성개질.본방법미사용상용적유궤세탈액,구유조작간단화배보등우점.매소시가분석30개양품,최대흡부배수위35배,양품분석정밀도RSD위2.2%(n=11),검출한(3σ)위2.0 ng/L.
Flow injection on-line sorption preconcentration and separation in a knotted reactor (KR) was coupled to cold vapor atomic fluorescence spectrometry for the determination of trace mercury in mineral water. Mercury was preconcentrated by on-line formation of mercury diethyldithiocarbamate complex (Hg-DDTC) and absorption of the resulting neutral complex on the inner walls of a knotted reactor. A 20%(V/V) HNO3 solution heated by electromagnetic induction heating technique was used as eluent to remove the absorbed Hg-DDTC from the KR, and then the vapor mercury generated by mixing the resulting solution and KBH4 was determined on-line by cold vapor atomic fluorescence spectrometry. The 20% HNO3 was employed as both the efficient eluent and the required acidic medium for subsequent mercury vapor generation in our work. Using 20% HNO3 instead of conventional organic solvent as eluent, the proposed method is simple, easy operational and environmentally friendly. Under the optimal experimental conditions, the sample throughput was approximatively 30/h with an enhancement factor of 35. The detection limit of mercury was 2.0 ng/L. The precision(RSD, n=11) was 2.2% at the 0.1 μg/L Hg2+ level.