Flame Atomic Absorption Spectrometry Determination of Cadmium in Environmental Water with Preconcentration and Separation by Sodium Trititanate Whisker

Sodium tertitanate whisker is a new material for preconcentration. The adsorption properties of sodium trititanate whisker for Cd(II) were studied and a new method for preconcentration and separation of Cd(II) was proposed. The adsorption rate of Cd(II) by sodium trititanate whisker was 98% at pH 5. 0 and Cd(II) could be cluted from sodium trititanate whisker with hydrochloric acid (C: 0.1 mol . L-1). The Cd(II) in environmental water was preconcentrated with sodium trititanate whisker and determined by flame atomic absorption spectrometry (FAAS). The detection limit (3 sigma, n = 9) was 3. 1 ng . L-1, and the relative standard deviation (RSD) was 2. 6%. The response of proposed method is linear in the concentration range of 0. 01-1. 0 mu g . mL(-1) of Cd(II). The method was applied to the determination of analytes in real samples, such as Changjiang River water, Canal water, Yudai River water etc. Good results were obtained (relative standard deviations were 1. 5%-4. 7%. while recoveries were 98%-102.0%.