キレート樹脂検知管によるモリブデン(IV)の迅速簡易定量

A chelating resin for the detector was prepared by mixing Pyrogallol Violet solution and 1.0 g of Dowex 2X8 or Dowex SAR anion exchange resin. After stirring for 30 min with magnetic stirrer, the resin was filtered off from the solution and dried at 50 °C in air to retain about 25% and 10% of the original water contentin Dowex 2X8 and SAR, respectively. A 200 or 300 mg portion of the resin was packed in a glass tube of 2.55 mmφ × 100 mm, both ends of resin were plugged with cotton wool. During determination, 0.5 cm3/3 min at 1525 °C (2X8) and 4 cm3/2 min at 90 °C (SAR) of sample solution (pH 3.5) was sucked into the column and the length of colored layer appearing in the column was measured. By placing a column containing cation exchanger in front of the detection tube, diverse cations could be preliminarily removed. Determinable concentration range of Mo (VI) ion was 0.272.7 (SAR) and 27665 (2X8) μg/cm3 with an error of ± 10%.