DETERMINATION OF CHROMIUM IN CATALYSTS BY ULTRAVIOLET VISIBLE SPECTROPHOTOMETRY

被引：17

作者：

HAUKKA, S ^{[1
]}

机构：

[1] UNIV HELSINKI,DEPT CHEM,DIV ANALYT CHEM,SF-00100 HELSINKI 10,FINLAND

来源：

ANALYST | 1991年 / 116卷 / 10期

关键词：

CHROMIUM DETERMINATION; CATALYST; SILICA; ULTRAVIOLET VISIBLE SPECTROPHOTOMETRY;

D O I：

10.1039/an9911601055

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Instrumental neutron activation analysis (INAA), atomic absorption spectrometry (AAS) and ultraviolet-visible (UV/VIS) spectrophotometry were applied as independent methods to the determination of chromium in Phillips-type polymerization catalysts. Catalysts were prepared in the gas phase, with the use of chromium oxychloride vapour as the adsorbate and silica as the support. From freshly prepared catalysts, chromium was quantitatively brought into solution with de-ionized water, enabling its rapid determination as chromate by UV/VIS spectrophotometry. The use of INAA and AAS in addition to UV/VIS spectrophotometry allowed the quantitative nature of the release of chromium from silica with de-ionized water to be verified, the accuracy of the chromium determination to be checked and the speciation of chromium between the oxidation states +3 and +6 to be determined.

引用

页码：1055 / 1057

页数：3

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