| Autor: |
Raheem S; School of Chemistry, Andhra University, Visakhapatnam 530 003, India., Prasad KM |
| Jazyk: |
angličtina |
| Zdroj: |
Talanta [Talanta] 1993 Dec; Vol. 40 (12), pp. 1809-14. |
| DOI: |
10.1016/0039-9140(93)80100-6 |
| Abstrakt: |
Trichromatic colorimetry was applied to the specification of colour changes of metallochromic indicators viz., murexide, pyrocatechol violet, bromopyrogallol red, pyrogallol red and chromazurol S in the complexometric titration of Nickel(II) with ethylene-diaminetetraacetic acid (EDTA), in order to assess the quality of colour change at the equivalence point with the help of CIE L*a*b* 1976 system and the values of SCD (Specific Colour Discrimination) parameter. A screened indicator, a mixture of murexide and methylene blue in the ratio 10:1 (m/m), is proposed as an ideal indicator in this titration as evidenced by the plots of a* vs. b* and from the numerical values of standard deviation for a large number of visual titrations. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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