Determination of Aluminium Oxide in Producing Cement from Phospho-cypsum by Flow Injection Analysis

The method of determination of Al2O3 in cement from phospho cypsum by flow injection analysis is developed by means of melting samples by microwave oven and using CAS as chromogenic reagent and Vc as interference free reagent for Fe3+.The interference of Fe- can be eliminated by means of calibration curves.The amounts of Al2O3 are detected in the range of 0~1.2×10-3 g·L-1 with RSD 3.1%,recovery rate 95%~105% and the detection rate 100 sumples·h-1.