Van Staden, J.F.2022-05-172022-05-172021/08/301996*https://repository.up.ac.za/handle/2263/85449Dissertation (MSc)--University of Pretoria, 1996.A short introduction regarding the advantages of flow injection analysis, the merits of the modified simplex optimisation technique and the importance of the analysis of phosphates at low levels are given. Theoretical background is given for flow injection analysis, optimisation and the analysis of phosphates. The modified simplex optimisation of factors and the evaluation of three different photometric methods of phosphate analysis with the aid of flow injection analysis are investigated.en© 2020 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.UCTDEvaluation of methodstrace amounts of phosphatesflow injection systemsDissertation