Holzapfel, C.R.Du Toit, P.J.Union of South Africa. Dept. of Agriculture2015-07-132015-07-1320151934Holzapfel, CR 1934, 'Studies in mineral metabolism XXVII. Modifications of the methods used at Onderstepoort for the determination of (A) Magnesium and Calcium; (B) Potassium, in grass-extracts', Onderstepoort Journal of Veterinary Science and Animal Industry, vol. 2, no. 1, pp.115-122.http://hdl.handle.net/2263/48362The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.A modified method for determining calcium and magnesium in grass-extracts is described, and the effect of iron on the original magnesium determination illustrated. Also, a modification of the washing mixture substituting ammonia for sodium hydroxide, for washing the precipitate of magnesium ammonium phosphate was found necessary.en©Union of South Africa, Dept. of Agriculture (original). ©University of Pretoria, Dept. of Library Services (digital).Veterinary medicineSouth AfricaVeterinary reportsVeterinary medicine -- South AfricaMineral metabolismMinerals in nutritionArticle