电感耦合等离子体原子发射光谱法测定镍硼合金中硼

镍硼合金作为高温焊接材料广泛应用于航空航天、钢铁冶金、石油化工以及能源电力等领域。镍硼合金的力学性能受硼含量影响,准确测定镍硼合金中的硼含量尤为重要。采用王水分解样品,在10%王水介质中,以电感耦合等离子体原子发射光谱法(ICP-AES)测定硼,建立了ICP-AES测定镍硼合金中硼的方法。实验结果表明,溶液中镍质量浓度不大于2500μg/mL时,不干扰硼的测定,其他共存元素含量较低,均不干扰测定;校准曲线的线性范围为0.25~25.00μg/mL,校准曲线线性相关系数为0.99995;方法检出限为2.0μg/g。方法用于镍硼合金中0.55%~9.81%硼的测定,结果的相对标准偏差(RSD,n=11)为0.92%~4.9%。分别使用实验方法和滴定法、分光光度法测定相同镍硼合金样品中硼,测定结果基本一致。

Determination of boron in nickel-boron alloy by inductivelycoupled plasma atomic emission spectrometry

As a kind of high temperature welding material, the nickel-boron alloy is widely used in many fields such as aerospace, iron and steel metallurgy, petrochemical industry, energy and electric power. The mechanical properties of nickel-boron alloys are affected by the content of boron. Therefore, it is very important to accurately determine the boron content in nickel-boron alloys. The sample was decomposed with aqua regia. The content of boron was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) in the medium of 10% aqua regia. The determination method of boron in nickel-boron alloy by ICP-AES was established. The experimental results show that the determination was not interfered by nickel when its mass concentration in sample solution was less than 2500μg/mL. The contents of other coexisting elements were low and had no interference with the determination. The linear range of calibration curve was 0.25-25.00μg/mL with linear correlation coefficient of 0.99995. The limit of detection was 2.0μg/g. The proposed method was applied for the determination of boron (0.55%-9.81%) in nickel-boron alloys. The relative standard deviations (RSD, n=11) of determination results were between 0.92% and 4.9%. The content of boron in nickel-boron alloy sample was determined by proposed method, titration method and spectrophotometry, respectively. And the measurement results were basically the same.