“…Lanthanum and strontium permanganates were prepared by methods described earlier [7][8][9] and their purity was checked by matching an X-ray diffraction pattern (Philips X-ray dif- fractometer) with an ASTM chart. Different pH solutions were prepared using standard buffer solutions (Clark and Lubes) [10] following the procedure given in the CRC handbook [11], and pH was measured using a digital pH meter (pH-5651, Electronic Corporation of India Limited, India).…”