Rapid determination of iron in manganese ore by spectrophotometry with sulfosalicylic acid
CHENG Xiu-hua1, WU Sheng-jie2
1. Xi’an Center of Geology Survey, China Geological Survey Bureau, Xi’an 710054, China; 2. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
Abstract：Sulfosalicylic acid spectrophotometry is a common analytical method for the determination of iron, but it is rarely used in practical determination of iron in manganese ore according to the interference of manganese ion in the determination of iron. Iron and sulfosalicylic acid could generate relatively stable 2∶1 yellow complex which has a maximum absorption peak at 420 nm at around pH 10, and the interference of manganese in the manganese ore in the determination of iron was eliminated by adding hydroxylamine hydrochloride, hereby an analytical method was established for the determination of iron in manganese ore by sulfosalicylic acid spectrophotometry. The method was applied to the determination of iron in national certified reference materials GBW07262 and GBW07263, and the results were consistent with the certified values, giving the relative standard deviation (RSD, n=5) of 3.1% and 1.1%, respectively. The method was applied to the determination of iron in actual manganese ore samples and the measurement results were notably high in adding no hydroxylamine hydrochloride and were consistent with those obtained by national standard method GB/T1508-2002 and ICP-AES in adding hydroxylamine hydrochloride. The method could be used to determine iron in manganese ores of different categories, particularly is suitable for the analysis of large batches of samples.
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