In theMAPA procedure [17], a samplemass of 1.5 gwas accuratelyweighed
out and transferred to a 250mL Erlenmeyer flask containing
70 mL of deionized water. The flask was shaken in a
mechanical shaker at roomtemperature for 15min. Subsequently,
the suspensionwas filtered and the resulting solutionwas collected
in a 100mL volumetric flask, followed by addition of 5mL
of H2O2 and 1 mL of Ti stock solution, and the volume was made
up to the mark with water.