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Pereira曾用3,4-二羟基苯甲酸在碱性介质中作铁的光度测定。本文报告用分光光度法研究此试剂与铁所形成的络合物,包括pH值对络合物形成的影响和络合物的组成。 3,4-二羟基苯甲酸(以下亦简作R)是依照成法制备,所得产物熔点198～199℃(文献值196～198)。标准正铁液:称0.864克铁矾(保证试剂,E.Merck),另加入少量硫酸配成一升溶液(每豪升含0.1毫克正铁)。
Pereira used 3,4-dihydroxybenzoic acid in alkaline media for the determination of iron. This paper reports the spectrophotometric study of the complex formed between this reagent and iron, including the effect of pH on the complex formation and the composition of the complex. 3,4-Dihydroxybenzoic acid (hereinafter also abbreviated as R) was prepared according to the method and the obtained product had a melting point of 198 to 199 ° C (documents 196 to 198). Standard ferroalloy: weigh 0.864 g of alum (guaranteed reagent, E. Merck), and add a small amount of sulfuric acid to make up one liter of solution (0.1 mg of ferroallene per liter).