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首页> 外文期刊>Revue roumaine de chimie >SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF COBALT USING 2,4-DINITROSORESORCINOL
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SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF COBALT USING 2,4-DINITROSORESORCINOL

机译：2,4-二硝基间苯二酚分光光度法测定痕量钴

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摘要

The complexation of water soluble dinitrosoresorcinol (DNR) with Co~(+2) was studied spectrophotometrically. A new sensitive and selective spectrophotometric method for the determination of Co~(+2) with DNR was developed. The Co~(+2)-DNR complex was formed quantitatively in the pH range 5.0-9.0 with an absorption maximum at 397 nm. The DNR reacts with Co~(+2) to form 1:3 stable (metal: ligand) complex. The Beer law was obeyed over the range of 1x10~(-2)-6x10~(-1) mg L~(-1) and molar absorption coefficient (ε) of Co~(+2)-DNR complex was 3.64 x 10~4 L mol~(-1) cm~(-1) at 397 nm. The interference of cations and anions was also investigated and especially the interference of Ni~(+2), Cu~(+2), Fe~(+3) were eliminated by the use of EDTA. The relative standard deviation of this method was found to be 5%. The developed method was applied to the determination of cobalt in standard Euronorm-CRM 585-1 Ferro-Chromium and Analysen-Kontrollprobe 530-1 samples. The obtained results of the analysis were very close to those of those stated for the standards.
机译：分光光度法研究了水溶性二硝基间苯二酚（DNR）与Co〜（+2）的络合作用。建立了一种新的灵敏，选择性的分光光度法测定DNR中Co〜（+2）的方法。 Co〜（+2）-DNR络合物在5.0-9.0的pH范围内定量形成，在397 nm处有最大吸收。 DNR与Co〜（+2）反应形成1：3稳定的（金属：配体）配合物。在1x10〜（-2）-6x10〜（-1）mg L〜（-1）范围内遵守比尔定律，Co〜（+2）-DNR配合物的摩尔吸收系数（ε）为3.64 x 10在397 nm下约4 L mol〜（-1）cm〜（-1）。还研究了阳离子和阴离子的干扰，特别是通过EDTA消除了Ni〜（+2），Cu〜（+2），Fe〜（+3）的干扰。发现该方法的相对标准偏差为5％。所开发的方法用于测定标准Euronorm-CRM 585-1铁铬和Analysen-Kontrollprobe 530-1样品中的钴。分析获得的结果与标准所规定的结果非常接近。

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