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在大量铁存在下(1:2500),测定微克量砷的底液条件,适用于0.2%以下铁矿石中砷的测定。方法灵敏度高,准确性与重现性良好。一、分析方法:称取0.1～0.5克样于聚四氟乙烯烧杯中,加少量水,加硝酸10～20毫升与氢氟酸2～4毫升,加热溶解数分钟,加盐酸5～10毫升和过氯酸2～3毫升,继续加热溶解并蒸至冒烟2～3分钟,稍冷加适量水溶解盐类,冷却并移入100毫升量瓶中,以水稀至刻度混匀。取
In the presence of a large amount of iron (1: 2500), the determination of arsenic at a concentration of a gram of the bottom liquid conditions, suitable for the determination of arsenic in iron ore 0.2% or less. The method has high sensitivity, good accuracy and reproducibility. First, the analytical method: Weigh 0.1 to 0.5 grams of sample in a Teflon beaker, add a small amount of water, add nitric acid 10 to 20 ml and hydrofluoric acid 2 to 4 ml, heated to dissolve a few minutes, add hydrochloric acid 5 to 10 ml And 2 to 3 ml of perchloric acid, continue heating to dissolve and steam to smoke for 2 to 3 minutes, slightly cold plus amount of water to dissolve salts, cooled and transferred to 100 ml volumetric flask, diluted with water to the mark mixing. take