The equations necessary for the determination of the rate constants corresponding to the opposite elementary steps for formation of the oxidant-reductant ester intermediate, as well as that corresponding to its redox decomposition, in the reduction of chromiumWI) by glutathione and other thiols at p
Response of chromium(V) to the diphenylcarbazide spectrophotometric method for the determination of chromium(VI)
β Scribed by James M. Eckert; Robert J. Judd; Peter A. Lay; Anthony D. Symons
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 269 KB
- Volume
- 255
- Category
- Article
- ISSN
- 0003-2670
No coin nor oath required. For personal study only.
β¦ Synopsis
Symons
Two chrommm(V) complexes are shown to respond to the dlphenylcarbazide spectrophotometnc method for the determmatlon of chrommm(V0, but with only 60% of the efficiency of CrNI) Aclddicatlon to pH l-2 m the presence of dissolved orgamc matter results m substantial reduction of the Cr(V) mthm 24 h
π SIMILAR VOLUMES
A voltammetric method of Cr(VI) determination in a flow system based on the combination of selective accumulation of the product of Cr(VI) reduction on hanging mercury drop electrode and a very sensitive method of chromium determination in the presence of cupferron previously described is proposed.
The method is based on a 1:l Cr(VI)/3-hydroxyflavone complex which is extracted into benzene at H,, = -0.6. The complex has a pK\* value of 7.8 f 0.1. Chromium is determined in the range 10-650 ng ml-' with excitation at 368 nm and emission measurement at 530 nm. The relative standard deviation is 6
The form βΏ x, t s F x q F x, t e q F x, t e e is 0 1 y1 used for the wave function in the transient solutions. This expression is similar to the three dominant terms in the steady-state solution from the Floquet theory, except that now F and F depend on t as well as x. The function F is the static