Design and application of a novel integrated electrochemical hydride generation cell for the determination of arsenic in seaweeds by atomic fluorescence spectrometry.
An integrated electrochemical hydride generation cell, mainly composed of three components (a gas liquid separator, a graphite tube cathode and a reticulate Pt wire anode), was laboratory constructed and employed for the detection of arsenic by coupling to atomic fluorescence spectrometry. This integrated cell was free of ion-exchange membrane and individual anolyte, with the virtues of low-cost, easy assembly and environmental-friendly. Using flow injection mode, the sample throughput could come to 120 h(-1) attributed to the small dimension of the cathode chamber. The operating conditions for the electrochemical hydride generation of arsenic were investigated in detail and the potential interferences from oxygen or various ions were also evaluated. Under the optimized conditions, no obvious oxygen quenching effects were observed. The limit of detection of As (III) for the sample blank solution was 0.2 ng mL(-1) (3sigma) and the relative standard deviation was 3.1% for nine consecutive measurements of 5 ng mL(-1) As (III) standard solution. The calibration curve was linear up to 100 ng mL(-1). The accuracy of the method was verified by the determination of arsenic in the reference materials GBW08517 (Laminaria Japonica Aresch) and GBW10023 (Porphyra crispata) and the developed method was successfully applied to determine trace amounts of arsenic in edible seaweeds.
Jiang
Xian-Juan
XJ
Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Gan
Wu-Er
WE
Han
Su-Ping
SP
Zi
Hong-Jing
HJ
He
You-Zhao
YZ
D001151:Arsenic / Q000032:analysis*; D002138:Calibration; D055664:Electrochemical Techniques / Q000379:methods* / Q000592:standards; D006859:Hydrogen / Q000737:chemistry; D010100:Oxygen; D012015:Reference Standards; D012624:Seaweed / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*
D006859:Hydrogen; D001151:Arsenic; D010100:Oxygen