Titrimetry in a continuous flow system - I. Apparatus and determination of sulphate

Abstract

Sulphate in the range of 5-2000 μmol · l-1 is automatically titrated with Ba(II) in a device with an optical detection which is able to correct automatically for dilution and turbidities. The flow-through system contains 80% v/v ethanol; the indicator is dimethyl sulfonazo(III). Above a concentration level of about 20 μmol · l-1 SO42-the standard deviation is less than 5% rel. The titration time is negligibly small as compared to the sampling time. © 1978 Springer-Verlag.