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Determination of trace arsenic and mercury in water by hydride generation atomic fluorescence method (full text)
The determination of trace arsenic and mercury in water by hydride generation atomic fluorescence spectrometry was studied. This method uses potassium borohydride as a reducing agent in a hydrochloric acid medium to convert the measured elements into volatile hydrides, and uses high-purity argon gas as the carrier gas to separate the volatile hydrides from the mother liquor and introduce them into the quartz furnace atoms. Atomization in a carburetor. A special hollow cathode lamp is used as the excitation light source to excite the atoms of the measured element to emit fluorescence. The fluorescence intensity value is proportional to the concentration of the measured element within a certain range. The method has high sensitivity, good precision, and high accuracy. The detection limits of arsenic and mercury are 0.0618 and 0.0158 μg · L-1, respectively.