饮用水中重金属汞检测方案(水质重金属)

VA Application Note V-212 Mercury in drinking water byanodic stripping voltammetry atthe scTRACE Gold using the946 Portable VA Analyzer Mercury and its compounds are toxic. The highest risk is caused by chronicpoisoning with mercury compounds ingested with food. A significant part of themercury present in the environment is of anthropogenic origin. Considerablesources are coal-fired power plants， steel， and nonferrous metal production，waste incineration plants， chemical industry， or artisanal gold mining where theuse of elemental mercury for the extraction of gold from the ore is still common.The WHO (World Health Organization) guideline value for inorganic mercury is6 ug/L. Results Hg in drinking water 2.1 pg/L Stirrer speed + 1.5 mL electrolyte 3000 rpm Mode DP-Differential pulse Stirring time 10s Cyclovoltammetric pretreatment Start potential -0.3 V Vertex potential 0.85V Sweep rate 1V/s No. of cycles 5 Potentiostatic Ultrapure water， resistivity>18MO.cm (25°C)， type l qrade (ASTM D1193) pretreatment Potential1 0.75 V Waiting time 1 10s Potential 2 0.3V Waiting time 2 90 s Equilibration time 5s sweep Current measuring ±1 pA range Start potential 0.3V End potential 0.6 V Potential step 0.004V Sweep rate 0.01 V/s Pulse amplitude 0.05V Pulse time 0.04 s solution * e.g.， Honeywell Fluka TraceSelect@， Merck suprapur@，or equivalent Solutions Electrolyte c(HCOOH)=0.8 mol/L c(KCI)=0.06 mol/L B(Fe3+)=5mg/L Hg standard additionsolution β(Hg)=1 mg/L， acidified with 1 mL/L HNO3 Q.Metro hm www.metrohm.comQ.Metrohm 本文利用946便携式 重金属快速分析仪测定了饮用水中的汞，给出了相应的实验条件。本方法稳定、简便、快速，适用于痕量汞的准确定量。