Determinação do teor de edta remanescente em soluções de limpeza de equipamentos industriais Determination of edta content in cleaning solutions after their use in industrial equipaments
<abstract language="eng">Cleaning solutions containing EDTA are widely employed to remove incrustation despite of the costs involved. The free content of EDTA in commercial solutions may be determined by mixing an aliquot to ammonium oxalate and using a standard calcium solution as t...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2007-08-01
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| Series: | Química Nova |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000400042 |
| Summary: | <abstract language="eng">Cleaning solutions containing EDTA are widely employed to remove incrustation despite of the costs involved. The free content of EDTA in commercial solutions may be determined by mixing an aliquot to ammonium oxalate and using a standard calcium solution as titrant. The end-point is detected by the formation of insoluble calcium oxalate after all EDTA is complexed. A system for turbidimetric detection of the end-point was envisaged to substitute the visual detection, which impaired the analyses of dark samples. The proposed method was tested with real samples and good accuracy and precision was obtained. |
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| ISSN: | 0100-4042 1678-7064 |