The outer husks of water bamboo the wasted of local markets in Taicung,Taiwan. solution of Ni and fe were made
deionized water using reagent grade salts. from SHOWA. The pH was adjusted to 5 with 0.1 M sodiumhydroxide and nitric acid (SHOWA) using a Istek Model 720P pH meter. moreover, a mixture of multiple ions adopted in this study was the ICP
Multi Element standard Solution IV from merck (USA) Each ion concentration was 1000+-10 mg/L. This solution was adjusted
to 5 prior of use.