AUTOMATED-DETERMINATION OF SULFITE AND SULFUR-DIOXIDE BY COOL FLAME MOLECULAR-EMISSION SPECTROMETRY AFTER REDUCTION TO HYDROGEN-SULFIDE WITH SODIUM TETRAHYDROBORATE-III

被引：19

作者：

AROWOLO, TA ^{[1
]}

CRESSER, MS ^{[1
]}

机构：

[1] UNIV ABERDEEN,DEPT PLANT & SOIL SCI,MESTON BLDG,ABERDEEN AB9 2UE,SCOTLAND

来源：

TALANTA | 1992年 / 39卷 / 11期

关键词：

D O I：

10.1016/0039-9140(92)80128-Z

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An automated method for the determination of sulphite and sulphur dioxide by cool flame molecular emission spectrometry is described. The method is based on the reduction of both compounds to hydrogen sulphide with sodium tetrahydroborate III. The sample which is mixed with NaBH4 is acidified with 6M hydrochloric acid and carried by a continuous-flow stream into a gas-liquid separator where the evolved hydrogen sulphide is swept by nitrogen into a cool hydrogen-nitrogen-entrained air flame. The intensity of the blue diatomic S2 emission generated is measured at 384 nm. The proposed method has a detection limit for sulphite of 0.029 mug/ml and relative standard deviations of 1.2 and 1.5% for 1 and 5 mug/ml respectively. The calibration graph is linear up to 24 mug/ml sulphite and samples can be analysed at a rate of about 40/hr. The method has been applied to the determination of SO2 in air and sulphite in wines.

引用

页码：1471 / 1478

页数：8

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