Influence of Matrix Effect on Determination of Trace Impurities in Electrolytic Manganese Dioxide by ICP-OES Spectroscopy
Electrolytic manganese dioxide has a depolarizing effect and it can effectively increase the discharge capacity as a positive active material.Its quality is crucial to the performance of the battery.With the mercury-free production and sales of batteries in 2006,batteries are no longer of amalgam,which can shield heavy metals from corrosion and reduce self-discharge.Most batteries require electrolytic manganese dioxide with iron,cobalt,nickel,vanadium,lead,copper,molybdenum,arsenic,and antimony contents below certain limits to prevent these harmful metal impurities from causing adverse reactions such as internal self-discharge,gas expansion,dendritic penetration of the diaphragm and leakage of the battery.These harmful metal impurities are often analyzed simultaneously using inductively coupled plasma optical emission spectrometry(ICP-OES),which has high accuracy and fast analysis speed,but is seriously affected by matrix effects during operation,especially when the content of impurity elements is as low as the trace range.The interference signal may be enhanced,weakened,or cover the signal of the element to be detected,resulting in inaccurate detection results.This article takes the SPECTRO ARCOS model ICP-OES spectrometer as an example.It combines the instrument characteristics and practical work experience in analyzing the interference characteristics that occurs during the detection process.We have discussed the methods to eliminate or deduct the matrix effects to ensure the accuracy of the detection results.
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