在200ml 0.3mol/L HCl介质中,用铜铁试剂沉淀分离大量铁。钢铁试剂的加入量按每100mg铁加1.2g计算。试验中分离400mg铁的分离率达99.98%以上,而铜也能同时被分离掉95%,且不吸附砷。从而实现了用二硫代安替比林甲烷(DTPM)测定钢铁中微量砷。该法比铜试剂银吸光光度法简便,比萃取光度法灵敏,且无毒。 In 200 ml of 0.3 mol / L HCl medium, a large amount of iron was separated by precipitation with a copper-iron reagent. The amount of steel reagents added per 100mg iron 1.2g calculation. In the experiment, the separation rate of 400mg iron was over 99.98%, while copper was also separated by 95% at the same time, and did not adsorb arsenic. Thus, the determination of trace arsenic in steel by dithio-antipyrine methane (DTPM) has been achieved. The method is simpler than copper reagent silver absorption photometry, more sensitive than extraction spectrophotometry, and non-toxic.