Study On The Determination Of Impurities In Aluminum-based Solution By Atomic Absorption Method

Aluminum is widely used in modern industry and daily life due to its advantages of large reserves,light weight and corrosion resistance.Impurities in aluminum and its alloys have a great influence on the properties of the materials,Therefore,it is significant to study a rapid and accurate method for the determination of Fe,Cu,Zn,Mn and Ni in aluminum and its alloys.Flame atomic absorption spectrometry(FAAS)has the advantages of high sensitivity,low spectral interference and low cost of purchase and operation.It is suitable for the testing and evaluation of samples in ordinary laboratories and small and medium enterprises,and is widely used in the metallurgical field,however,Matrix interference,background interference and co-existing element interference still exist in the determination of element content by flame atomic absorption spectrometry,which affect the precision and accuracy of the determination,its scope of application is directly related to the contents of elements,the properties of matrix elements and the kinds of coexisting elements.In this paper,the determination and calibration methods of Fe,Cu,Zn,Mn and Ni in Al-based solution were studied by flame atomic absorption spectrometry,based on the standard curve method,the matrix interference,background interference and co-existing elements interference in the determination of impurity in Al-based samples are eliminated or reduced by correcting the method through matrix matching and deuterium lamp background deduction,verify the feasibility of the calibration method,improve the precision and accuracy of aluminum-based sample testing,the results show that the correlation Coefficient of AAS standard curve of Fe,Cu,Zn,Mn,Ni in Al-based solution is 0.99%～ 0.9999%.The precision and accuracy of AAS determination of iron in Al-based solution can be improved effectively by background correction of deuterium lamp,the relative error of determination is lower than that of ICP-AES,and the iron content is 4.3μg/m L,matrix matching correction can effectively improve the precision and accuracy of the test,but the effect of atomic absorption method is not good when the iron content is below 2.7μg/m L.In the determination of copper in al-based solution,it shows when the content of copper is 1.1μg/m L～211.00μg/m L,the standard curve method is used to obtain higher precision and accuracy,and the relative error is smaller The recovery of standard addition can be improved by the matrix matching method,but the precision is decreased and the relative error is large.In the determination of zinc in al-based solution by AAS,the recovery of standard addition is improved obviously,the relative error is reduced and the accuracy is improved when the concentration of zinc is 339μg/m L,and when the concentration of zinc is 0.14μg/m L～25μg/m L,the deuterium lamp background correction improves the recovery rate of calibration,reduces the relative error and improves the accuracy of measurement.AAS determination of manganese in aluminum-based solution,manganese concentration is 0.80μg/m L～28.0μg/m L,using the standard curve method,the test precision is higher,but the standard curve method,matrix matching method and deuterium lamp background correction spike recovery The rate does not meet national standards.When the manganese concentration is 0.09μg/m L～0.12μg/m L,the relative error of ICP-AES is smaller.For nickel AAS determination in aluminum-based solutions,when the nickel concentration is 0.18 to 5.9 μg/m L,the precision of the matrix matching method is high,and the relative error is small,which can meet the determination of nickel.Nickel concentration is below 0.14μg/m L,ICP-AES is more accurate.This study provides a systematic method for AAS determination of Fe,Cu,Zn,Mn and Ni in al-based solutions,and improves the precision and accuracy of the determination,the determination of Fe,Cu,Zn,Mn and Ni in Al-based solution was optimized,which provided a practical basis and a reference for accurate,rapid and efficient determination of impurities in al-based sample or solution with low cost and strong operability.