Determination of manganese in ferroboron by sodium periodate oxidation spectrophotometry
Manganese could enhance the toughness of ferroboron.The accurate determination of manganese is helpful for the production of high-quality ferroboron alloy materials.The sample was dissolved in aqua regia at low temperature and digested by perchloric acid fuming.Manganese was oxidized to septivalent with sodium periodate in sulfuric acid-phosphoric acid medium and then determined at 530 nm by spectro-photometry.Thus,a method for determination of manganese in ferroboron was established by periodate sodium oxidization spectrophotometry.The samples were treated by three methods,i.e.,perchloric acid fuming in presence of sulfuric acid and phosphoric acid,perchloric acid fuming followed by adding sulfuric acid-phosphoric acid,and slag dissolution with acid.The results showed that the determination results of manganese in ferroboron samples were basically consistent by the three methods above.The determination results of manganese in certified reference materials/reference material of ferroboron were consistent with the certified values/standard value.Wherein,the operation of perchloric acid fuming followed by adding sulfuric acid-phosphoric acid was the most simple.The determination range of method was 0.050％-1.00％(mass fraction,the same below).The correlation coefficient of calibration curve was 0.999 99.The appar-ent molar absorptivity was 2.3X103 L·mol-1·cm-1.The limits of detection and limits of quantification for this method were 0.004％and 0.012％,respectively.The contents of manganese in certified reference material and actual samples of ferroboron were determined according to the proposed methods.The rela-tive standard deviations(RSD,n=11)of determination results were between 0.25％and 0.46％.The contents of manganese in three certified reference materials/reference material and two actual samples of ferroboron were determined according to the proposed methods.The determination results of certified ref-erence materials/reference material were consistent with the certified values/standard value,and the deter-mination results of actual samples were consistent with those obtained by slag dissolution with acid-induc-tively coupled plasma atomic emission spectrometry(ICP-AES).
slag dissolution with acidferroboronmanganesesodium periodatespectrophotometry
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