Abstract
A method is described for selective complexometric determination of mercury, thiourea being used as masking agent. An excess of EDTA is added and the surplus EDTA is back-titrated with lead nitrate, with Xylenol Orange or Methylthymol Blue as indicator (pH 5–6). Thiourea is then added to decompose the mercury-EDTA complex and the liberated EDTA is again back-titrated with lead nitrate. The interference of various cations has been studied.
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