柱前衍生／流动注射微柱预富集和ICP－AES法测定高纯氧化钅兰中痕量非稀土元素  

Determination of Trace Non rare earth Metals in High Purity Lanthanum Oxide by ICP AES with Preconcentration on Active Carbon silica Gel Microcolumn in a Flow Injection System

作　　者：吉红念[1] 刘炼[1] 廖振环[1] 江祖成[1] 

机构地区：[1]武汉大学化学系

出　　处：《分析科学学报》1996年第3期198-201,共4页Journal of Analytical Science

摘　　要：利用自合成的碳硅凝胶为吸附材料，以铜试剂（ＮａＤＤＴＣ）为柱前衍生试剂，实现了Ａｌ（Ⅲ）、Ｃｒ（Ⅵ）、Ｃｕ（Ⅱ）、Ｆｅ（Ⅲ）、Ｖ（Ⅴ）流动注射（ＦＩ）微柱预富集．以稀ＨＮＯ３停流洗脱富集物，ＩＣＰ－ＡＥＳ法测定洗脱液中上述元素．在优化条件下，富集倍数近１０倍，检出限为ｎｇ／ｍＬ级，ＲＳＤ＜５．０％（ｎ＝７），方法用于高纯Ｌａ２Ｏ３中非稀土杂质测定。Self synthesized active carbon silica gel was used as absorbent while diethyldithiocarbamate sodium(NaDDTC) as chelating agent in a flow injection system to preconcentrate non rare earth metals prior to their determination by ICP AES. Experimental parameters such as pH, flow rate, length of reacting coil, eluent acidity, amount of the absorbent, matrix concentration, were optimized. The enrichment factors are approximately 10.0 with the detection limits of ng/mL level, and RSD for ppm level metals are 2.3-5.0%(n=7). The method could be used for the determination of μg/g level of metals impurities in highly pure La 2O 3 with good results.

关 键 词：流动注射 ICP-AES 氧化镧 微柱预富集 柱前衍生 

分 类 号：O614.331[理学—无机化学] O657.32[理学—化学]