Chlorpromazine hydrochloride as an analytical reagent : A new indicator for titrations with very dilute ceric sulphate solutions
✍ Scribed by Lee Kum-Tatt; H.K. Tong
- Publisher
- Elsevier Science
- Year
- 1962
- Tongue
- English
- Weight
- 483 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
REAGENT PART III. A NEW INDICATOR FOR TITRATIONS WITH VERY DILUTE CERIC SULI'HATE SOLUTIONS I,El< lCUhI-'l-h'l"r Ccric sulphatc has long been rccogniscd as a convenient reagent for the volumetric determination of iron(I1) and arsenic(II1). Ferroin and N-phenylanthranilic acid are the two most commonly used indicators for such titrations. Other indicators that have been rccommcnded arc substituted phcnanthrolines**2, amino derivatives of diphenylamines, methylenc blue J, triphcnylmcthanc dyess, z,2'-dipyridyln, ruthenium 2,2'-dipyridyl7 and Rhoclamine GG 8. More recently the use of crystal violet0 and copper phthalocyanine 4,4',4",4"'-tetrasulphonic acid *O has been proposed but these arc not likely to supplant ferroin.
However, the titration of pg quantities of reducing substances with very dilute ccric sulphate solutions has been severely limited by the lack of an inclicator with a small or no blank correction. With 0.x N ceric sulphate, 0.02 ml is generally deducted from the titre for one drop of the ferroin indicator used; similar corrections are maclc for I ml of the dipyridyl ferrous pcrchlorate indicator and for 0.5 ml of the triphenylmethane indicatorsii.