Determination Of Sulphate In Waters Research Articles

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Articles published on Determination Of Sulphate In Waters

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Elimination of ionic interferences in the determination of sulphates in water using the lead-sensitive ion-selective electrode.

In the titration of sulphate ions with lead(II) perchlorate solution using a lead-sensitive electrode for end-point determination, the addition of 75%V/V of methanol permits titration of 10–5M samples. Under these conditions, a 200-fold excess of nitrate does not interfere, but chloride at this concentration introduces a small systematic error of 4%. Significant errors are caused by the presence of calcium, which co-precipitates as calcium sulphate with lead sulphate. In titrations carried out rapidly, the negative error increases with the amount of calcium and the true equilibrium may be obtained after a relatively long time. Increasing the ionic strength of the solution by addition of sodium perchlorate eliminates the interference by calcium, but for concentrations of sulphate below 10–4M it is advantageous to remove calcium by using a cation-exchange resin in the hydrogen form. The method has been applied successfully to the determination of sulphate in water.

The Analyst

Jan 1, 1976
Adam Hulanicki + 2

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Determination of sulfate in waters

Determination of sulfate in industrial waters is performed by shaking with Dowex 50-X8 resin (removing of metal ion interferences) and titration of aqueous acetone ( 1 1 , v v ) solution with barium perchlorate employing Dimethylsulfonazo III as indicator. Only phosphate and arsenate interfere.

Microchemical Journal

Sep 1, 1975
B.W Budesinsky

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Colorimetric determination of sulfate in water with barium violurate

Analytica Chimica Acta

Apr 1, 1975
Jack L Lambert + 1

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Suggested Method for Turbidimetric Determination of Sulfate in Water

In view of the status accorded to the turbidimetric procedure in Standard Methods and the apparent popularity of the method, an investigation of some of the variables involved was undertaken and a significantly improved procedure was developed. The results of this investigation cannot be easily summarized and are too lengthy to be suitable for publication. A limited number of copies of a report of this investigation are available from the authors. This article provides a list of the variables that were investigated, and covers the following topics: experimental apparatus; reagents; procedure; calculations; and, precision and accuracy.