Fig. 5

Plot of the amount of lead(II) sulphate versus the ratio of sulphur to the sum of the chromium and sulphur measured using WDX in the lead(II) sulphate and lead(II) chromate mixtures standards

Plot of the amount of lead(II) sulphate versus the ratio of sulphur to the sum of the chromium and sulphur measured using WDX in the lead(II) sulphate and lead(II) chromate mixtures standards