Ai J, Tang Z Y
Department of Pharacy, Wuhan Institute of Chemical Technology, Wuhan 430073, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2001 Oct;21(5):658-60.
A new method for the determination of trace niobium and tantalum in soil and geochemical exploration samples by inductively coupled plasma atomic emission spectrometry with solvent extraction flow injection was proposed. The niobium and tantalum were extracted with the mixed solvent of MIBK and TBP at 1 mol.L-1 HF and 4 mol.L-1 H2SO4. Experiment conditions and manifold parameters were investigated in detail. The detection limits were 0.5 x 10(-12) g.L-1 and 0.8 x 10(-12) g.L-1. The proposed method was rapid, simple and accurate, it has been applied to the determination of trace niobium and tantalum in national standard samples. The results were in good agreement with certified values with precisions of 4.5% and 5.1% RSD (n = 10). The sample throughput for niobium and tantalum is 20.h-1.
提出了一种采用溶剂萃取流动注射电感耦合等离子体原子发射光谱法测定土壤和地球化学勘查样品中痕量铌和钽的新方法。铌和钽在1mol·L-1氢氟酸和4mol·L-1硫酸介质中，用甲基异丁基酮和磷酸三丁酯的混合溶剂萃取。详细研究了实验条件和流路参数。方法的检出限分别为0.5×10(-12)g·L-1和0.8×10(-12)g·L-1。该方法快速、简便、准确，已应用于国家标准样品中痕量铌和钽的测定。结果与认定值相符，相对标准偏差（n=10）分别为4.5%和5.1%。铌和钽的样品分析通量为20个·h-1。
