Rapid Chelatometric Determination of Chemical Composition of Lanthanum-Strontium-Manganate using Mixed Metallochromic
نویسنده
چکیده
A simple complexometric method for stepwise determination of lanthanum, strontium and manganese in Lanthanum-Strontium-Manganate (LSM) has been worked out. The method involves joint titration of the elements with EDTA at pH 10.0 followed by selective precipitation of strontium as sulphate from a homogenous solution involving displacement reaction between EDTA complex of strontium and ZnSO4. The EDTA released from Sr-EDTA complex is the measure of strontium. In the same solution lanthanum is complexed with fluoride and EDTA released from La-EDTA complex is titrated with standard zinc solution and the equivalent concentration of lanthanum is calculated. The mass proportion of manganese is obtained after subtracting lanthanum and strontium from the joint titration of all the three elements. The optimum conditions for precipitation of SrSO4 and interferences due to various ions have also been studied. Complexometric analysis results obtained for La, Sr and Mn in LSM samples compare favorably with those obtained by modern instrumental Inductively Coupled Plasma Atomic Emission Spectrometric (ICP
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