Cr(VI) was analysed by diphenylcarbazide
method, and Cd(II) by dithizone method.
spectrophotometrically at 540 nm using diphenylcarbazide
as the complexion agent (Rand et al.
Adsorption Experiments: Estimation of Chromium by Diphenylcarbazide
Aliquot part of 1 and 5 mL of liquid was analyzed by ultraviolet visible spectrometry (UV-Vis) to determine the Co(II) and Cr(VI) ion concentrations by using a Perkin-Elmer Spectrometer Lambda 10 ultraviolet-visible spectrophotometer analyzer at Lambda =260 nm for Co(II) and at Lambda =540 nm for Cr(VI), peroxide with bicarbonate method  and 1,5 diphenylcarbazide
method were used respectively for colour development .
The concentration of Cr(VI) was determined using diphenylcarbazide
colorimetric method at a wavelength of 540nm.
Reduction of hexavalent chromium by bacteria In order to determine the ability of bacterial isolates to reduce Cr6+ (100 ug/ml) to Cr3+, diphenylcarbazide
method was used (Fulladosa et al.
Cr(VI) was analyzed spectrophotometrically using 1,5 diphenylcarbazide
method  at [lambda] max 540 nm (Varian Cary 50 Conc UV-visible spectrophotometer).
Blocks were squeezed in a hydraulic press to express free treating solution from the wood void spaces, and the expressed solution was analyzed for its hexavalent chromium content using the diphenylcarbazide
colorimetric method (ASTM 1996) and for its total chromium, copper, and arsenic content using inductively coupled plasma-atomic emission spectroscopy (ICP-AES) (AWPA 2001a).
(DPC) is one such chelating agent, which gives a highly sensitive and selective colour reaction towards chromium (VI) in acidic medium.
Activity of PSII+PSI was assayed with diphenylcarbazide
(DPC) as the electron donor and MV as the acceptor in 60 mM NaCl, 40 mM Tricine-KOH (pH 8.
The oxidized form of chromium formed the complex with diphenylcarbazide
Both methods use anion exchange chromatography followed by diphenylcarbazide
(DPC) post-column chemistry.