CeO2/ZrO2-based Diffusive Gradients in Thin Films Technique for Measurement of As(III) and As(V) in Water and Sediment

作者：Wang Yi; Jiang Xiao; Ren Su-Yu; Cui Ying; Tan Feng^*

来源：Chinese Journal of Analytical Chemistry, 2018, 46(11): 1829-1835.

DOI：10.11895/j.issn.0253.3820.181395

• Diffusive gradient in thin film
• Cerium oxide
• zirconium oxide
• Arsenic speciation analysis

A new diffusive gradient in thin films sampling method (DGT) with a CeO2/ZrO2 mixed binding gel was developed for measurement of As(III) and As(V) in water and sediment. New CeO2/ZrO2 binding gel showed efficient adsorption toward As(III) and As(V) and was better than CeO2 gel and ZrO2 gels. The effective capacities of CeO2/ZrO2. DGT for As(III) and As(V) were 77. 8 mu g and 58. 1 mu g per device, respectively. Solution pH and ionic strength had no effects on the uptake of As(III) and As(V) by CeO2/ZrO2. DGT. The masses of As(III) and As(V) accumulated by the DGT increased linearly with time (R-2 > 0. 99) up to 72 h for tap water and synthetic seawater samples. Limits of detection (LODs) of As(III) and As(V) by CeO2/ZrO2-DGT coupled with an on. line hydride generation atomic fluorescence spectrometry (HG. AFS) were 0. 06 mu g/L and 0. 08 mu g/L, respectively. The method was used for measuring As(III) and As(V) in surface and sediment of several reservoirs in Dalian. The measured concentrations of As(III) and As(V) were 0. 13 -0. 14 mu g/L and 0. 20-0. 25 mu g/L in the surface water and 0. 38-1. 82 mu g/L and 0. 69-3. 46 mu g/L in sediment.

• 出版日期2018-11
• 单位大连理工大学