2007, 23(9):74-77.
Abstract:
The trace amount of arsenic (As) in vegetable oil was determined by hydride generation atomic fluorescence spectrometry method (HG-AFS). The programmable temperature ashing of samples could avoid the As loss. 2 % HCI and 15 g/L KBH4 were used as acid medium and reducing agent, respectively. The effects of some factors on the fluorescence intensity of arsenic, such as acid medium, HCl concentration, the amount of KBH4, the lamp electricity, etc., were investigated and optimized. Within the As content range of 0.0~35.0 g/L, a linear calibration curve for arsenic was obtained and the correlative coefficient and detection limit were of 0.9998 and 0.04 µg/L, respectively. Besides, the recovery rates, the RSDs of the standard solution and standards were found to be 85.3%~95.5%, 0.57%~1.20% and 4.87%~5.12%, respectively. The method was simple, fast and with high sensitivity, which could be applied to the analysis of trace amounts of arsenic in vegetable oil.
