Photochemical vapor generation of carbonyl for ultrasensitive atomic fluorescence spectrometric determination of cobalt |
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| Institution: | 1. Group of Applied Instrumental Analysis, Department of Chemistry, Federal University of São Carlos, P.O. Box 676, São Carlos SP 13560-970, Brazil;2. Department of Chemistry, Wake Forest University, Winston-Salem NC 27109, USA;1. Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China;2. College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China;1. National Research Council Canada, Ottawa, ON K1A 0R6, Canada;2. College of Earth Sciences, Chengdu University of Technology, Chengdu, Sichuan 610059, China;3. Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China;1. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, PR China;2. Department of Chemistry and the MOE Key Lab of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, PR China;3. College of the Environment and Ecology, Xiamen University, Xiamen, PR China |
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| Abstract: | UV photochemical vapor generation (photo-CVG) as sample introduction was first adapted for determination of ultratrace cobalt by atomic fluorescence spectrometry (AFS). Cobalt volatile species can be generated when the buffer system of formic acid and formate containing Co (II) is exposed to UV radiation. The generated gaseous products were separated from liquid phase within a gas–liquid separator and then transported to AFS for determination of cobalt. Factors affecting the efficiency of photo-CVG were investigated in detail, including type and concentration of low molecular weight (LMW) organic acid, buffer system, UV irradiation time, reaction temperature, carrier gas flow rate and hydrogen flow rate. With 4% (v/v) HCOOH and 0.4 mol L? 1 HCOONa buffer solution, 150 s irradiation time and 15 W low pressure mercury lamp, a generation efficiency of 23–25% was achieved. A limit of detection (LOD) of 0.08 ng mL? 1 without any pre-concentration procedure and a precision of 2.2% (RSD, n = 11) at 20 ng mL? 1 were obtained under the optimized conditions. The proposed method was successfully applied in the analysis of several simple matrix real water samples. |
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