122nd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Analytical Chemists II
Room No. Room 321
Time FRI 10:40-:
Code ANAL2.O-17
Subject A study on the determination of inorganic arsenic by solid phase extraction and laser ablation inductively coupled plasma mass spectrometry
Authors Seon Hwa Lee, Sang-Ho Nam*
Department of Chemistry, Mokpo National University, Korea
Abstract The toxicity and chemical properties of arsenic depend on the concentration and chemical structure present in the natural environment. Inorganic arsenic is more toxic than organic arsenic, thus the accurate determination of inorganic arsenic in various samples is needed. IC-ICP-MS (Ion Chromatography-Inductively Coupled Plasma-Mass Spectrometry) is the current method for quantitative and qualitative determination of arsenic. However, the method has disadvantage of expensive and complex instrument, and elaborate sample preparation. In this study, inorganic arsenic species were separated using a membrane filter disk in the SPE (Solid Phase Extraction) method, then determinated by LIBS (Laser Induced Breakdown Spectroscopy) and LA-ICP-MS (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry). The detection limit of inorganic arsenic is 10 mg/kg by the SPE membrane filter with LIBS. The detection limit of inorganic arsenic was 1.0 μg/kg by LA-ICP-MS. The pH value of the sample was adjusted to 4 using ammonium hydroxide and phosphoric acid for the efficient separation of inorganic arsenic species. The linear dynamic range was from 1 to 1000 µg/kg by LA-ICP-MS, and the correlation coefficient was 0.9997. A new method using solid phase extraction and LA-ICP-MS was a accurate and sensitive method for quantitative analysis of inorganic arsenic in a sample.
E-mail 2seon_hwa@naver.com