| Abstract: | The measurement is carried out after addition of perchloric acid up to a concentration of 0.45 M perchloric acid, and the results are compared with those obtained in 0.16 M sodium citrate as well as with a gas-chromatographic determination, and they show a good agreement, The detection limit is 0.002 mg/l F?, the coefficient of variation is nearly 0.01 at 0.85 mg/l F?, independently of whether a direct measurement or a measurement with a standard addition is carried out. The measurement is disturbed by aluminium(III)- and Iron(III)-ions. |
