Abstract：A method for determining trace mercury in galvanized sheet by reduced separation - atomic fluorescence spectrometry was established after hexamethylenetetramine - hydrochloric acid solution was used to get rid of galvanized sheet. A study was conducted on the effect of hexamethylenetetramine amount and acidity on the determination. Testing conditions including potassium borohydride concentration, lamp current, photoelectric tube with negative pressure, shield gas and carrier gas flow rate, the height of atomizer, atomizer temperature, and sample injection volume were optimized. And the interference caused by coexistent elements was studied. The result indicated the fluorescence strength had excellent linear relationship with mercury concentration of 0.20-40.0 ng/mL when mercury was determined under following conditions; lamp current of 10 mA, negative pressure of -320 V, carrier gas flow rate of 400 mL/min, shield gas flow rate of 1 000 mL/min, atomizer height of 8.0 mm, integration time of 10.0s, 1.0 mL of intermittent flow injection solution, and with hydrochloric acid (1+19) as current carrying solution and 20.0 g/L potassium borohydride solution (containing 5.0 g / L sodium hydroxide) as reducer. The detection limit of mercury was 0.10 μg/g. The RSD for determination result of sample was 1.3 % and the standard addition recovery was 98%-100%.
王艳泽，刘正，郝贵奇，张雪凌. 还原分离-原子荧光光谱法测定镀锌板涂镀层中痕量汞[J]. 冶金分析, 2013, 33(5): 41-45.
WANG Yan-ze, LIU Zheng, HAO Gui-qi, ZHANG Xue-ling. Determination of trace mercury in the coating of galvanized sheet by reduction separation - atomic fluorescence spectrometry. , 2013, 33(5): 41-45.
