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合金中铁的测定,一般采用硫氰酸盐法和邻菲啰啉法,前者稳定性差,后者由于Fe(Ⅱ)与邻菲啰啉反应速度慢,特别是在酒石酸、柠檬酸等络合剂存在时。向红菲啰啉(BPT)已广泛应用于水、血清、高纯氧化锌、铜、钴、镍、铂等纯金属中微量铁的萃取光度测定,由于采用苯等有机溶剂萃取,因此操作手续较为复杂且有毒。本文采用Tween-20为增溶剂,研究了向红菲啰啉吸光光度法测定纯铝、铝合金、铝基稀土合金和铜合金中铁的显色条件。试验发现本体系在瞬间显色完全;酸度范围和线性范围都很宽;对主要共存元素镍、锌、锰、锡、铅等的允许量都较高,不必加入EDTA等掩蔽剂掩蔽,在硫脲(10%)5.0ml
Determination of iron in alloy, generally using thiocyanate method and phenanthroline method, the former poor stability, the latter due to Fe (Ⅱ) and phenanthroline reaction is slow, especially in tartaric acid, citric acid and other complexing agent When it exists. Phenanthroline (BPT) has been widely used in the determination of trace iron in pure metals such as water, serum, high-purity zinc oxide, copper, cobalt, nickel and platinum. Due to the extraction with organic solvents such as benzene, More complex and toxic. In this paper, using Tween-20 as solubilizer, the conditions for the determination of iron in pure aluminum, aluminum alloy, aluminum-based rare earth alloy and copper alloy were studied by the red phenanthroline absorption spectrophotometry. The experiment found that the system developed completely in an instant; the range of acidity and the linear range were wide; the allowable amounts of the main coexisting elements such as nickel, zinc, manganese, tin and lead were high without the need of masking agent such as EDTA; Urea (10%) 5.0 ml