Determination of sulphate ion by replacement of iodate in iodine-131 labelled barium iodate
Abstract
Between 2 and 100 µmoles of sulphate (60 to 3200 µg of sulphur) can be determined in aqueous solution, by passing the solution through a column of iodine-131 labelled barium iodate and counting the filtrate. The blank can be reduced by using 20 per cent. methanol. Each determination takes only a few minutes, and the precision is ±2·5 per cent. The apparatus required is simple and inexpensive, apart from the counting equipment. The method has been tested with standard kale, and has been applied to the determination of sulphur in fruticose lichens.
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