Extraction and separation of phosphorus by tributyl phosphate for determination of iron, zinc, silicon and aluminum in high purity yellow phosphorus by inductively coupled plasma atomic emission spectrometry
LI Jia1, HUANG Yong-qing2
1. Jiangxi Province Safety Production Science and Technology Research Center Safety Scientific Research Standards, Jiangxi Province Industrial Safety Engineering Technology Research Center, Nanchang 330030,China; 2. Jiangxi Chemical Industry Design Institute of Technology Design Institute,Nanchang 330030,China
Abstract：2g of yellow phosphorus was digested in nitric acid by reflux condensation. The phosphoric acid in high-purity yellow phosphorus digestion solution was extracted and separated using tributyl phosphate (TBP) to reduce the complexation with iron, zinc, silicon and aluminum. Meanwhile, the viscosity of digestion solution for testing could be decreased. The content of iron, zinc, silicon and aluminum was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Consequently the determination method of iron, zinc, silicon and aluminum in high-purity yellow phosphorus by ICP-AES after extraction and separation with TBP was established. The extraction conditions of this method were obtained as below: the volume ratio of sample solution and TBP was 1∶1; the oscillation time was 1min; the standing time was 30min. The mass concentration of elements in range of 0.50-50μg/mL was linear to the corresponding emission intensity. The correlation coefficients (r) of calibration curves were higher than 0.9995. The detection limits of elements were lower than 0.093μg/g. The proposed method was applied for the determination of iron, zinc, silicon and aluminum in yellow phosphorus samples, and the found results were consistent with those obtained by flame atomic absorption spectrometry (FAAS). The relative standard deviations (RSD, n=5) were all less than 0.80%.
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LI Jia, HUANG Yong-qing. Extraction and separation of phosphorus by tributyl phosphate for determination of iron, zinc, silicon and aluminum in high purity yellow phosphorus by inductively coupled plasma atomic emission spectrometry. , 2017, 37(11): 52-58.
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