Anions in non saline waters - Determination of Anions in Natural and Treated Waters - page 298

Fig. 2.51 Recorder tracing for the flow injection determination of sulphate in
water. Recorder paper speed 30cm h −1 . Recorder range 500mV.
Sulphate concentration in mg L −1 . Negative peaks due to alkaline
buffer EDTA solution sampled
Source: Reproduced with permission from Springer Verlag [770]
After 1200 determinations, no baseline drift was noticed and changes in the slope of the
calibration curves were very small (less than 5%), indicating good long-term stability.
Also, relative standard deviations of measurements were in general about 0.5% when the
sulphate content exceeded 10mg L −1.