MPT-AES法测定合金钢中铜锰钼

DETERMINATION OF COPPER, MANGANESE AND MOLYBDENUM IN THE ALLOY STEELS BY MICROWAVE PLASMA TORCH ATOMIC EMISSION SPECTROMETRY

用微波等离子体炬(MPT)为激发光源,氩气为等离子体工作气体,用气动雾化进样,研究了微波等离子体炬原子发射光谱法(MPT -AES)测定合金钢中铜、锰、钼的方法。分别详细考察了载气流量、工作气流量、氧屏蔽气流量、微波功率等实验参数对测定铜、锰、钼的影响,同时考察了共存元素对铜、锰、钼测定的影响。结果表明:铜、锰、钼的检出限分别为3.3、3.7、4 2 μg·L-1,RSD(n =6 )分别为0 .2 7%、2 .4 %和1.7% ,并且测得它们的质量浓度线性范围分别为0 .0 2～5 0、0 .0 4～5 0、0 .2 0～5 0mg·L-1。方法操作简便,自动化程度高,运转费用低,准确快速,是一种测定合金钢中铜、锰、钼的行之有效的分析方法。

Using microwave plasma torch (MPT) as excitation light source, argon as support gas, the sample solution was introduced into plasma by pneumatic nebulization system. The determination of copper, manganese and molybdenum in the alloy steels by microwave plasma torch atomic emission spectrometry (MPT-AES) was studied. The experimental conditions including carrier gas flow rate, support gas flow rate, oxygen shield gas flow rate and microwave power were optimized. The effects of coexistent ions on copper, manganese and molybdenum emission signal were investigated in detail, respectively. The detection limits for copper, manganese and molybdenum are 3.3, 3.7, 42 μg·L-1, respectively. The relative standard deviations (n = 6) are less than 0.27%, 2.4%, 1.7%, respectively. Linear range are 0.02-50, 0.04-50, 0.20-50 mg·L-1 for Cu, Mn and Mo, respectively. The result shows that the method is easy operation, high automation, low operation cost, accuracy and rapid. It is an effective method to determine copper, manganese and molybdenum in the alloy steels.