锌冶炼烟气制酸废水中汞的测定

采用冷原子吸收光度法测定经石灰乳和铁盐处理后的锌冶炼烟气制酸废水中汞的浓度时，可按废水中汞浓度与其pH的关系，从试样pH的高低大致估计其汞浓度范围，由此确定其稀释倍数和取样量。试样用KBrO3-KBr消解法消解，用直接法稀释，这样可以减少操作步骤、缩短测定周期、减少样品中汞的损失、提高监测结果的可靠性和准确性，同时可减少人力、物力浪费，降低监测成本。

Determination of Hg in Acid Production Wastewater from Zn Smelting Fume

Cold atomic absorption method is used in the determination of Hg content in the wastewater in the acid production from Zn smelting fume. The wastewater is pretreated with lime milk and iron salts. The concentration range of Hg can be estimated according to the wastewater pH, because with which the concentration of Hg is related. So the volume and dilution rate of sample can be determined. The sample is counteracted by KBrO3 -KBr and diluted directly. The method can simplify operation steps,shorten determination time, reduce Hg loss, improve the accuracy and reliability,and economize manpower,material resources and monitoring cost.