Activated Carbon Modified with Sodium Dodecyl Sulfonate as a Solid Phase Sorbent for the Separation and Preconcentration of Trace Cadmium in Water Samples with Detection by Electrothermal Atomic Absorption Spectrometry

作者：Hou, Guangshun; Li, Yingjie^*; Cheng, Yuanyuan

来源：Analytical Letters, 2013, 46(12): 1978-1990.

DOI：10.1080/00032719.2012.745088

• Cadmium determination
• Electrothermal atomic absorption spectrometry
• Modified activated carbon
• Sodium dodecyl sulfonate
• Water samples

A novel absorbent was prepared by sodium dodecyl sulfonate (SDS)-modified activated carbon (SDS-AC) and was employed as the microcolumn packing material for separation/preconcentration of trace Cd(II). The method based on Cd(II) was quantitatively retained by SDS-AC sorbent, which entailed cation exchange nature and negative charged surface, facilitating favorable retention of positively charged ions. The retained Cd(II) was effectively recovered with elution by 1mol<bold>L</bold>-1 HNO3, and the eluent was quantified by electrothermal atomic absorption spectrometry (ET-AAS). Under the optimized conditions, the limit of detection (LOD) for Cd(II) was 3ng<bold>L</bold>-1 with the consumption of 20.0mL sample solution. The relative standard deviation (RSD) for ten replicate measurements of 50ng<bold>L</bold>-1 Cd(II) was 2.9%. The developed technique was demonstrated for the determination of trace Cd(II) in water samples and the recoveries for spiked samples were found to be in the range of 94.9-107.2%. For validation, two certified reference materials of water samples (GBW08607 and GBW08608) were analyzed, and the results obtained were in good agreement with the certified values.

• 出版日期2013-8-13
• 单位河南理工大学