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测定微量砷的铜试剂银光度法,已获得较广泛的应用。本工作重点试验了钢铁中主要干扰元素的消除方法。试验证明:铁、镍、钴等离子能加速砷化氢的形成,影响吸收液将砷完全吸收;溶样时形成的钨酸对砷有吸附作用,这些均导致砷的测定结果偏低。我们采用酒石酸和三乙醇胺(或糊精)分别掩蔽铁和钴、镍;用磷酸络合钨,从而消除了这些元素的干扰,获得了较满意的结果。本方法可直接应用于各种钢铁中含0.001—0.05％砷量的测定。方法较简便,测定
Determination of trace arsenic copper reagent silver photometry, has been widely used. This work focuses on the elimination of the main interference elements in steel. Experiments show that iron, nickel and cobalt ions can accelerate the formation of arsine and affect the absorption of arsenic in the absorption solution. The tungstic acid formed on the sample dissolves arsenic, which leads to the low determination of arsenic. We use tartaric acid and triethanolamine (or dextrin) to mask iron, cobalt and nickel, respectively; and phosphoric acid to complex tungsten, thus eliminating the interference of these elements and obtaining more satisfactory results. The method can be directly applied to various kinds of steel containing 0.001-0.05% arsenic determination. The method is simple and convenient