Carbamazepine (CBZ, >98% purity),
sulfadimethoxine (SDM, >98% purity), trimethoprim (TMP, >98%
purity),
all test amino acids (i.e., glycine, alanine, serine, leucine, proline,
phenylalanine, glutamic acid, asparagine, and histidine), phenyl methyl
sulfoxide (PMSO), phenyl methyl sulfone (PMSO2), sodium
thiosulfate, and sodium borate were purchased from Fisher Scientific
(Austin, Texas, USA). A wet chemical procedure was applied to prepare
solid potassium ferrate(VI) (K2FeO4),59 (link) which had a purity of more than 90%. The solid
K2FeO4 was dissolved in a 0.01 M sodium borate
buffer solution. The concentration of Fe(VI) solution was determined
by measuring the absorbance at 510 nm using a 1.0 cm path length and
a molar absorption coefficient of ε510nm = 1150 M–1 cm–1,59 (link) with a UV–visible spectrometer (Thermo Scientific Co., USA).
All reaction solutions were prepared using Milli-Q ultrapure water
(>18 MΩ cm–1 resistivity, Millipore, Milford,
USA).
sulfadimethoxine (SDM, >98% purity), trimethoprim (TMP, >98%
purity),
all test amino acids (i.e., glycine, alanine, serine, leucine, proline,
phenylalanine, glutamic acid, asparagine, and histidine), phenyl methyl
sulfoxide (PMSO), phenyl methyl sulfone (PMSO2), sodium
thiosulfate, and sodium borate were purchased from Fisher Scientific
(Austin, Texas, USA). A wet chemical procedure was applied to prepare
solid potassium ferrate(VI) (K2FeO4),59 (link) which had a purity of more than 90%. The solid
K2FeO4 was dissolved in a 0.01 M sodium borate
buffer solution. The concentration of Fe(VI) solution was determined
by measuring the absorbance at 510 nm using a 1.0 cm path length and
a molar absorption coefficient of ε510nm = 1150 M–1 cm–1,59 (link) with a UV–visible spectrometer (Thermo Scientific Co., USA).
All reaction solutions were prepared using Milli-Q ultrapure water
(>18 MΩ cm–1 resistivity, Millipore, Milford,
USA).