【摘要】 建立了流动注射在线共沉淀HG AFS测定痕量锡的分析方法。方法基于锡在碱性介质中与氢氧化镁共沉淀 ,沉淀收集在锥形沉淀腔中 ,用HCl溶洗沉淀和NaBH4反应 ,产生的氢化物被载气引入原子化器中进行测定。测定锡的相对标准偏差为 5 15 % ( 3 0ng·mL-1,n =10 ) ,检出限为 0 2 1ng·g-1,检出限较直接进样降低了 12倍。对国家标准参考物中锡的测定结果与标准值相符。更多还原

【Abstract】 It is reported that a FI on-line co-precipitation technique for the pre-concentration of trace amount of Sn with the precipitate of Mg(OH) 2 as carrier is hyphenated with AFS determination.The co-precipitation is carried out in NaOH medium and the precipitate is collected in a precipitation collector.The precipitate is then dissolved by HCl and reacted with NaBH 4,the hydride is transferred directly into the atomizer.The relative standard deviation is 5 15% for 10 determinations of 30 ng·mL -1 Sn and the detection limit of 0 21 ng·g -1 is obtained.The developed method has been applied to the determination of trace Sn in geosamples with satisfactory results.更多还原