Determination of trace phosphorus in cobaltniobiumzirconium alloy by inductively coupled plasma atomic emission spectrometry
MA Haibin 1,2 ,SUN Youxian1 ,WANG Minghai*3,WANG Jian 2
1 Department of Control Science and Engineering of Zhejiang University, Hangzhou 310058,China; 2Focused Photonics(Hangzhou),Inc,Hangzhou 310052,China; 3Cental Iron & Steel Research Institute, Beijing 100081,China
Abstract： The samples were decomposed by nitric acid and hydrofluoric acid. The calibration series solution was prepared using highpurity cobalt as matrix. Then, the content of phosphorus in sample solution was determined by inductively coupled plasma atomic emission spectrometry. The analytical conditions were obtained, including acidity, sample uptake, atomization gas flow rate, power, observation height and analytical lines. The interference test of niobium and zirconium was conducted. The results showed that the niobium and zirconium in sample did not interfere with the determination of phosphorus content. The fast automated curvefitting technique (FACT) was investigated. The results showed that, the interference of Co 178.205 nm with P 178.222 nm could be eliminated by this technique. The content of phosphorus was determined under optimal conditions. The detection limits of this method was 0.000 6% of P 178.222 nm and 0.000 5% of P 213.618 nm (for 0.2 g of sample in 50 mL). The recoveries of standard addition were 93%112%. The relative standard deviation (RSD) was smaller than 10% (n=7). The determination results of phosphorus content in sample were consistent with those obtained by photometry.
