- 作者: Sukumar Chatterjee, Ajai K. Pillai and V. K. Gupta*
- 作者服務機構: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, (Chhattisgarh), 492001, India
- 中文摘要: Rhodamine-B has been proposed as a simple and sensitive colorimetric reagent for the estimation of sulphur dioxide in air. The air sample containing sulphur dioxide is passed through the absorbing solution of aqueous potassium iodate and N-chlorosuccinimide to liberate iodine. The liberated iodine bleaches the pinkish red coloured rhodamine-B dye, which measured at 555 nm. Beer’s law was obeyed in the range of 0.5-5.0 mg, of sulphite per 25 mL (0.02-0.2 ppm) equivalent to 0.4-4.0 mg of sulphur dioxide (0.016-0.16 ppm). The molar absorptivity and Sandell’s sensitivity were found to be 4.56 ’ 105 l mol-1 cm-1 and 0.00017 mg cm-2, respectively. The method has been suitably modified and successfully applied to the determination of sulphites in water after liberation of sulphur dioxide in acidic medium.
- 英文摘要: --
- 中文關鍵字: Colorimetric; Rhodamine-B dye; Sulphur dioxide and sulphites determination; Environmental samples.
- 英文關鍵字: Colorimetric; Rhodamine-B dye; Sulphur dioxide and sulphites determination; Environmental samples.