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变色酸双偶氮胂酸类试剂测定稀土元素已有文献报导,但用〔2—(2—胂酸苯偶氮)-7-(2,6′-溴-4′-氯苯偶氮)-1,8-二羟基-3,6-二磺酸萘)〕(简称DBC-偶氮胂)作显色剂的文章还不多,且对题述所测元素仅作了简单介绍。 本文对钇,钆或镧-DBC-偶氮胂体系作了系统的实验研究。结果表明,该法显色迅速,络合物稳定性高、重现性好,选择性较高和操作简便。现已用于直接测定二元银合金中微量钇、钆或镧,结果令人满意。 一、仪器及主要试剂 东德VSU-2P分光光度计;钇、钆、镧标准溶液各为1.5、1.0、1.0mg/ml,用时配成7.5、10、10μg/ml;DBC-偶氮胂溶液(0.05％)。
Chromotropic acid bis-arsenazic acid reagent for the determination of rare earth elements has been reported in the literature, but with 2- (2- arsonium phenylazo) -7- (2,6’-bromo-4’-chlorophenylazo) -1,8-dihydroxy-3,6-disulfonaphthalene)] (referred to as DBC-arsenazo) as a developer of the article is not much, and only the subject of the test described a brief introduction. In this paper, yttrium, gadolinium or lanthanum-DBC-arsine systems were systematically investigated. The results show that the method has the advantages of rapid color development, high stability of complex, good reproducibility, high selectivity and easy operation. Has been used for direct determination of binary silver alloy yttrium, gadolinium or lanthanum, with satisfactory results. First, the instrument and the main reagent East Germany VSU-2P spectrophotometer; yttrium, gadolinium, lanthanum standard solutions were 1.5,1.0,1.0mg / ml, with time to make into 7.5,10,10μg / ml; DBC-arsenazo solution (0.05%).