Abstract：The trade of electrostatic precipitator dust of sintering machine head is increasingly active and the content of silver is an important index for its pricing. Therefore, the investigation on determination method for silver in electrostatic precipitator dust of sintering machine head is of great significance. After the sample was pretreated by ashing in muffle furnace at 700 ℃, it was dissloved with 15 mL of aqua regia-8 mL of hydrofluoric acid-5 mL of perchloric acid via heating on electric hot plate, or digested with 6 mL of aqua regia-3 mL of hydrofluoric acid-2 mL of perchloric acid via microwave digestion. Then, the sample solution was determined by flame atomic absorption spectrometry (FAAS) with 20%-25%(volume fraction) aqua regia as medium. Consequently, the determination method of silver in electrostatic precipitator dust of sintering machine head was established by electric hot plate heating digestion-FAAS and microwave digestion-FAAS, respectively. The interference tests of coexisting elements showed that the elements in sample did not interfere with the determination except for iron and calcium. The interference of iron and calcium could be eliminated by adding 5 500 μg/mL of iron and 571.76 μg/mL of calcium (equivalent to 800 μg/mL of calcium oxide) into standard solution series of silver which was used for plotting calibration curve. The content of silver in electrostatic precipitator dust actual samples of sintering machine head was determined respectively according the two above methods. The results were consistent with those obtained by inductively coupled plasma atomic emission spectrometry(ICP-AES). The relative standard deviation (RSD, n=11) was 1.4%-2.2% and 2.0%-2.6%, respectively. The recoveries were between 95% and 104%.
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