Selective masking and demasking for the stepwise complexometric determination of aluminium,lead and zinc from the same solution |
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Authors: | Nijhuma Kayal Nahar Singh |
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Institution: | (1) Analytical Chemistry Section, Central Glass and Ceramic Research Institute, 196, Raja S.C. Mullick Road, Kolkata-32, India;(2) Analytical Chemistry section, National Physical laboratory, Dr K.S. Krishnan Marg, New Delhi-12, India |
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Abstract: | Background A complexometric method based on selective masking and de-masking has been developed for the rapid determination of aluminium,
lead and zinc from the same solution in glass and glass frit samples. The determination is carried out using potassium cyanide
to mask zinc, and excess disodium salt of EDTA to mask lead and aluminium. The excess EDTA was titrated with standard Mn(II)SO4 solution using Erichrome Black-T as the indicator. Subsequently selective de-masking agents – triethanolamine, 2,3-dimercaptopropanol
and a formaldehyde/acetone mixture – were used to determine quantities of aluminium, lead and zinc in a stepwise and selective
manner. |
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Keywords: | |
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